V2X Server Apparatus Sidelink Relay Range Extension
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Solution Overview
Problem
The limited communication range of V2X communication poses a constraint in enhancing user safety in road traffic scenarios.
Innovation Solution
A server apparatus that communicates with terminal apparatuses to configure them for receiving and relaying alarm messages via sidelinks, extending the communication range by instructing terminal apparatuses to relay messages across neighboring geographical areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If V2X communication is used for real-time road safety alerts, then user safety can be enhanced, but the limited communication range constrains the effectiveness
Solution Approach 1:
The patent introduces relay terminal apparatus as intermediary nodes that receive alarm messages from transmitting terminals and forward them to other terminals. This mediator mechanism extends the communication range beyond the direct sidelink limitation, allowing safety alerts to propagate across multiple geographical areas through a chain of relay nodes.
Solution Approach 2:
The patent transitions from direct one-to-one or one-to-many communication to multi-hop communication through relay nodes. This adds a temporal and spatial dimension to message propagation, where messages can travel through multiple nodes across different geographical areas, effectively extending the reach beyond the original communication range limit.
2Length of stationary object
If relay functionality is added to extend communication range, then alarm message reachability is improved, but system complexity increases
Solution Approach 1:
The relay terminal apparatus autonomously determines whether to relay alarm messages based on its current geographical area and the message's target area, without requiring complex centralized control. The terminal uses pre-configured area information and simple comparison logic to make relay decisions, keeping the individual device complexity low while achieving system-wide range extension.
Solution Approach 2:
The patent divides the extended communication range into multiple geographical areas, with each relay terminal responsible for specific area transitions. This segmentation allows the system to manage complexity by localizing relay decisions to specific geographical contexts rather than requiring global system coordination.
Data Source
AI summary
There is provided a server apparatus including a communication unit to communicate with terminal apparatuses operating as V2X application clients, and a server processing unit to operate as a V2X application server. The server processing unit can access a database indicating a neighbor relationship between predefined geographical areas in which first and second geographical areas being indicated as neighboring areas. The server processing unit configures each terminal apparatus to receive, via a sidelink, an alarm message regarding road safety from another terminal apparatus, receives location information of a first terminal apparatus, determines that the first terminal apparatus is located in the first geographical area, and instructs the first terminal apparatus to relay, via the sidelink, the alarm message received in the first geographical area so that a second terminal apparatus in the second geographical area can receive the relayed message.