Multi-Carrier Sidelink Sync Reference Selection
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Solution Overview
Problem
Current 5G V2X systems face challenges in ensuring time synchronization between multiple carriers due to in-band interference and half-duplex constraints, leading to suboptimal transmission performance in sidelink carrier aggregation scenarios.
Innovation Solution
A method for selecting a synchronization reference source based on the status of User Equipment (UE) across multiple carriers, determining cell coverage attributes, and prioritizing synchronization reference sources to align subframe boundaries and reduce interference, utilizing a synchronization reference source selection module to ensure consistent synchronization across all carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If independent synchronization reference source selection is performed on each carrier, then carrier-specific optimization is achieved, but time synchronization between multiple carriers deteriorates
Solution Approach 1:
The patent segments the synchronization reference source selection process by introducing a primary carrier concept. The system divides multiple carriers into a primary carrier (which maintains independent selection based on local conditions) and secondary carriers (which must align with the primary carrier's synchronization source). This segmentation allows carrier-specific optimization for the primary carrier while ensuring time synchronization across all carriers through the primary carrier's reference.
Solution Approach 2:
The patent introduces a hierarchical dimension to the synchronization selection process. Instead of treating all carriers equally (single dimension), it creates a two-level hierarchy: primary carrier level for independent decision-making and secondary carrier level for alignment. This dimensional change resolves the contradiction by allowing local optimization at the primary carrier level while maintaining global synchronization at the system level.
2Object-affected harmful factors
If subframe boundaries of multiple carriers are aligned, then in-band interference is reduced, but device complexity increases
Solution Approach 1:
The patent merges the synchronization reference source selection of multiple carriers by requiring secondary carriers to use the same synchronization source as the primary carrier. This merging approach aligns subframe boundaries across carriers, reducing in-band interference. The complexity is managed by establishing clear selection priorities and rules that automate the alignment process without requiring complex coordination mechanisms.
Solution Approach 2:
The primary carrier acts as an intermediary between the synchronization sources and secondary carriers. It mediates the synchronization process by establishing its own reference source independently and then serving as the reference for secondary carriers. This intermediary role simplifies the overall system complexity by centralizing the synchronization decision-making at the primary carrier level while ensuring all carriers remain synchronized.
3Reliability
If a unified synchronization reference source is used for all carriers, then time synchronization is improved, but adaptability to local conditions deteriorates
Solution Approach 1:
The patent segments the synchronization system into a primary carrier that maintains adaptability to local conditions and secondary carriers that ensure unified synchronization. The primary carrier can independently select synchronization sources based on local conditions (GNSS, gNB, or other UEs), preserving adaptability. Secondary carriers must align with the primary carrier's selected source, ensuring unified time synchronization across all carriers.
Solution Approach 2:
The patent introduces dynamic behavior to the synchronization system. The primary carrier's synchronization source selection is dynamic and can change based on local conditions and signal quality. When the primary carrier changes its synchronization source, secondary carriers dynamically update to match. This dynamic approach allows the system to maintain both unified synchronization and adaptability to changing local conditions.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart-city, smart-car, connected car, health care, digital education, smart retail, security and safety services.The present invention discloses a method for selecting a synchronization reference source for multi-carrier sidelink communication, including: selecting a synchronization reference source according to a status of a UE on multiple carriers; and using the selected synchronization reference source as a synchronization reference source for the UE on all carriers.