Sidelink Message Carrier Selection for V2X Reliability
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Solution Overview
Problem
In next-generation Vehicle-to-Everything (V2X) communication, there is a need for an efficient carrier selection method and frequency band usage technique to effectively transmit sidelink messages, especially in scenarios where LTE V2X coexists with other technologies like dedicated short-range communication and Wi-Fi on unlicensed frequency bands, and user equipment (UE) has limited transmission and/or reception capabilities.
Innovation Solution
A method where user equipment (UE) selects sidelink messages based on their importance levels and chooses carriers with prioritized communication, preferring carriers with high priority for messages of high importance, while avoiding congested or competing radio access technology carriers, and transmitting low-resolution information on lower-priority carriers when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple carriers are used for sidelink message transmission, then the capacity and reliability of communication are improved, but the device complexity and resource management difficulty increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting carrier selection based on message importance levels. Different importance levels (e.g., safety-critical vs. non-critical messages) are mapped to different carrier priorities, allowing the system to optimize communication reliability for critical messages while managing overall system complexity through structured parameter-based decision making.
Solution Approach 2:
The patent segments the carrier selection process into distinct priority levels corresponding to message importance. Carriers are categorized into different priority groups, and messages are routed to appropriate carrier segments based on their importance level, simplifying the overall selection complexity through structured segmentation.
2Reliability
If high-priority carriers are used for all messages, then message transmission reliability is improved, but the loss of time due to carrier congestion increases
Solution Approach 1:
The patent applies local quality by matching the quality level of the carrier to the quality requirement of the message. High-importance messages are transmitted on high-priority carriers with higher reliability, while low-importance messages use lower-priority carriers, optimizing both reliability and timing based on local message characteristics.
Solution Approach 2:
The patent implements partial action by selectively applying high-priority carrier transmission only to messages that require it based on their importance level. Not all messages receive the excessive resource allocation of high-priority carriers, thus avoiding unnecessary delays for non-critical messages while maintaining reliability for critical ones.
3Productivity
If carrier aggregation is introduced for V2X communication, then the communication capacity and coverage are improved, but the coexistence issues with other technologies on unlicensed bands increase
Solution Approach 1:
The patent introduces carrier priority as an intermediary mechanism that mediates between V2X communication needs and coexistence requirements. By defining carriers with different priorities based on their interference characteristics and technology types, the system can select appropriate carriers that act as intermediaries between high-capacity requirements and low-interference constraints.
Solution Approach 2:
The patent applies parameter changes by modifying carrier selection based on importance levels and carrier priorities. The system dynamically adjusts which carriers are used for V2X messages based on current conditions, allowing capacity optimization while managing interference through parameter-based carrier differentiation.
4Adaptability or versatility
If UEs with limited transmission capabilities are considered, then the adaptability of the system is improved, but the productivity of message transmission decreases
Solution Approach 1:
The patent applies parameter changes by adjusting carrier selection based on UE capabilities and message importance. For UEs with limited transmission capabilities, the system selects from a restricted set of carriers appropriate for their capabilities, while still maintaining adaptability through importance-level-based prioritization. This ensures critical messages are transmitted reliably even with limited capabilities.
Solution Approach 2:
The patent implements partial action by applying full carrier aggregation and priority-based selection only where needed based on UE capabilities. For UEs with limited capabilities, a simplified subset of the full carrier selection mechanism is applied, maintaining adaptability while accepting reduced productivity for those specific devices.
Data Source
AI summary
Provided is a method for transmitting a sidelink message by a terminal in a wireless communication system. The method comprises: selecting at least one sidelink message among a plurality of sidelink messages, on the basis of the importance of each of the sidelink messages; selecting at least one carrier among a plurality of predetermined carriers, on the basis of the priority of each of the carriers and the importance of the selected at least one sidelink message; and transmitting the selected at least one sidelink message through the selected at least one carrier, wherein a sidelink message having relatively high importance among the selected at least one sidelink message is preferentially transmitted through a carrier having relatively high priority among the selected at least one carrier.