In-Vehicle Terminal Relay Selection Using Connected-Terminal Information
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Solution Overview
Problem
Existing in-vehicle communication systems face challenges in selecting reliable relay stations for indirect communication when direct sessions are unavailable, leading to potential communication failures between vehicles and base stations.
Innovation Solution
The in-vehicle terminal employs a vehicle-to-vehicle communication control unit to manage neighboring vehicle information, a base station communication control unit to request connected terminal information, and a relay management unit to select a relay station based on this information, enabling indirect communication when direct connections fail.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay station selection is based only on position information and communication state of neighboring vehicles, then the selection process is simple and quick, but the reliability of indirect communication cannot be ensured because the selected relay may not actually be able to communicate with the destination base station
Solution Approach 1:
The system performs preliminary actions by having base stations proactively provide connected terminal information to neighboring base stations before relay selection is needed. This advance information sharing enables more reliable relay station selection without adding complexity to the actual relay selection process, as the necessary communication state data is already available when needed.
Solution Approach 2:
The patent introduces base stations as intermediaries that facilitate information exchange between relay candidate vehicles and destination base stations. The base station acts as a mediator that provides connected terminal information to help the source vehicle select an appropriate relay station, thereby improving reliability without requiring direct complex interactions between all vehicles.
2Reliability
If direct session is used for communication between base station and terminal, then the communication path is simple and direct, but reliability is reduced when direct sessions cannot be ensured simultaneously for multiple paths
Solution Approach 1:
The system dynamically switches between direct sessions and indirect sessions based on communication conditions. When direct sessions are available, they are used for simple and efficient communication. When direct sessions cannot be ensured, the system dynamically transitions to indirect sessions using relay stations, thereby maintaining communication reliability without permanently increasing system complexity.
Solution Approach 2:
The patent changes the communication mode parameter from exclusively direct sessions to a flexible combination of direct and indirect sessions. This parameter change allows the system to adapt to different communication scenarios, ensuring reliability when direct sessions are unavailable while maintaining simplicity when they are available.
Data Source
AI summary
An in-vehicle terminal includes: a V2X communication control unit controlling communication with a neighboring vehicle capable of vehicle-to-vehicle communication; a neighboring vehicle information management unit managing neighboring vehicle information acquired by the vehicle-to-vehicle communication; a V2N communication control unit performing control to provide a first base station connected via direct communication with information on a second base station unable to be connected via direct communication and to request the first base station to provide connected terminal information on the neighboring vehicle connected to the second base station; a relay management unit selecting a relay station that is the neighboring vehicle relaying indirect communication with the second base station based on the neighboring vehicle information and the connected terminal information; and a redundant system management unit instructing the relay management unit to perform indirect communication with the second base station when the second base station cannot be connected via direct communication.