Carrier Selection for V2X Synchronization Signals
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Solution Overview
Problem
In V2X communication, achieving reliable synchronization between devices in the absence of traditional cellular network entities, such as base stations, is challenging, especially when devices are not synchronized and require additional synchronization information for effective data transmission.
Innovation Solution
User equipment (UE) is equipped with a determination unit to select appropriate carriers for transmitting synchronization signals based on a mapping between services and carriers, allowing for Physical Sidelink Broadcast Channel (PSBCH) transmission, enabling reliable synchronization even without external synchronization mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If devices operate in decentralized communication without traditional cellular network entities, then communication independence and flexibility are improved, but synchronization reliability deteriorates
Solution Approach 1:
The user equipment performs self-synchronization by selecting carriers based on service-carrier mapping relationships without requiring external base station coordination. Each device independently determines appropriate carriers for synchronization signal transmission based on the service type being performed, enabling decentralized operation while maintaining synchronization reliability.
Solution Approach 2:
The system changes the parameter of carrier selection by introducing service-carrier mapping relationships. Different services are mapped to different carriers, and the user equipment selects carriers dynamically based on the current service being performed, thereby adapting synchronization parameters to match service requirements in a decentralized environment.
2Ease of operation
If user equipment selects carriers independently without external coordination, then communication flexibility is improved, but synchronization accuracy deteriorates
Solution Approach 1:
The invention introduces service-carrier mapping as a parameter change mechanism. The mapping relationships define which carriers are appropriate for which services, and the user equipment changes carrier parameters based on the current service being performed. This structured parameter change approach maintains synchronization accuracy while preserving operational flexibility.
Solution Approach 2:
The system uses predefined service-carrier mapping relationships that can be copied and applied across different user equipment devices. These mapping relationships serve as templates that ensure consistent carrier selection behavior across the decentralized network, maintaining synchronization accuracy through replicated knowledge rather than centralized coordination.
3Adaptability or versatility
If multiple carriers are used for synchronization signal transmission, then synchronization coverage is improved, but device complexity increases
Solution Approach 1:
The service-carrier mapping relationship provides a systematic parameter change approach. Instead of requiring complex real-time analysis of multiple carriers, the system uses pre-defined mappings that directly associate services with appropriate carriers. This reduces the computational complexity of carrier selection while still enabling multi-carrier synchronization coverage when services require it.
Solution Approach 2:
The service-carrier mapping relationship acts as an intermediary between the service requirements and carrier selection. Rather than directly complex carrier selection logic, the mapping serves as a mediator that translates service types into appropriate carrier choices, simplifying the decision-making process while achieving comprehensive synchronization coverage.
Data Source
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Figure 3A~4B
Figure 4C~4D
AI summary
A user equipment, UE, comprising a selection unit configured to select one or more carriers for transmitting synchronization signal from a carrier set, and a transmission unit configured to convey the synchronization signal over the one or more selected carriers.