Sidelink Synchronization Priority Control in NR V2X
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Solution Overview
Problem
User Equipment (UE) in wireless communication systems face challenges in selecting an appropriate synchronization reference for sidelink communication, particularly in scenarios where the base station or Global Navigation Satellite Systems (GNSS) synchronization priorities are unclear, leading to inefficiencies in synchronization processes.
Innovation Solution
A method where a UE receives information from a base station regarding sidelink synchronization priority order, which includes GNSS-based and base station-related synchronization references, allowing it to prioritize and select an appropriate synchronization source based on received information, ensuring efficient sidelink communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE autonomously selects a synchronization reference without clear priority information, then the synchronization process can proceed, but the synchronization reliability and communication efficiency deteriorate due to selecting suboptimal references
Solution Approach 1:
The base station performs preliminary action by pre-determining and signaling the synchronization priority order to UEs before actual sidelink communication occurs. This allows UEs to have clear guidance on which synchronization references to prefer, eliminating the need for complex autonomous decision-making during operation while ensuring reliable synchronization selection.
2Productivity
If the base station provides detailed synchronization priority information, then the UE can select the optimal synchronization reference, but the signaling overhead and system complexity increase
Solution Approach 1:
The invention changes the parameter of synchronization reference selection by introducing a priority order parameter that the base station configures. Instead of UEs making complex decisions based on multiple factors, the system transforms the selection problem into a simpler parameter-based choice where UEs follow the pre-defined priority order signaled by the base station, thereby improving efficiency without proportionally increasing complexity.
3Reliability
If the UE follows a strict priority order for synchronization references, then the synchronization process becomes deterministic and reliable, but the adaptability to dynamic network conditions decreases
Solution Approach 1:
The invention applies dynamics by allowing the base station to update and reconfigure the synchronization priority order according to changing network conditions. While UEs follow a deterministic priority order during operation, the base station can dynamically adjust this priority order and signal updates to UEs, enabling the system to adapt to varying conditions while maintaining deterministic behavior at the UE level during each operational phase.
Data Source
AI summary
Provided are a method and an apparatus for performing, by a first device, wireless communication. The method may comprise the steps of: receiving, from a base station, first information related to SL synchronization priority; receiving, from the base station, second information indicating whether a base station-related synchronization reference can be selected as a synchronization source; and performing synchronization according to one synchronization reference of a GNSS-related synchronization reference and other terminals on the basis of the second information indicating that the base station-related synchronization reference cannot be selected as a synchronization source.