Roadside Unit Handover via Predictive Path Construction
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Solution Overview
Problem
Existing communication systems for road-to-vehicle communication face challenges in smoothly switching between roadside units without interrupting communication and in reducing infrastructure costs, especially in wide-area systems with complex network topologies.
Innovation Solution
A communication system that includes roadside units, a terminal, and a server functioning as a control plane to predict the intended roadside unit and arrival time based on acquired travel information, constructing a communication path before the vehicle's arrival, using a PON access system and SDN controller to manage communication and reduce infrastructure costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a wide-area communication system is constructed for road-to-vehicle communication, then the coverage area is improved, but the infrastructure cost increases
Solution Approach 1:
The system performs preliminary actions by predicting the vehicle's future position and pre-establishing communication paths before the vehicle actually needs them. The server calculates predicted positions based on current position and movement information, then proactively sets up communication routes in advance, avoiding the need for immediate infrastructure deployment everywhere.
Solution Approach 2:
The server acts as an intermediary that coordinates between multiple roadside units and vehicles. It manages the prediction of vehicle positions, determines which roadside units will be needed, and orchestrates the pre-establishment of communication paths, thereby reducing the need for direct peer-to-peer infrastructure between all possible roadside units and vehicles.
2Reliability
If roadside units are switched to maintain communication with a traveling vehicle, then communication continuity is improved, but the switching complexity increases
Solution Approach 1:
The system performs preliminary actions by predicting which roadside unit will be needed next and pre-establishing the communication path before the vehicle actually reaches that area. This eliminates the need for rapid switching at the moment of handover, as the path is already prepared in advance based on predicted vehicle movement.
Solution Approach 2:
The system uses feedback from the vehicle's current position and movement information to continuously update predictions about future positions. This feedback loop allows the server to adjust which roadside units will be needed and when, enabling smooth transitions without complex real-time switching decisions.
3Ease of operation
If communication paths are established in advance for predicted vehicle positions, then the handover smoothness is improved, but the prediction accuracy requirement increases
Solution Approach 1:
The system applies partial action by establishing communication paths for a limited number of predicted positions rather than all possible positions. It focuses on predicting and preparing for the most likely future positions based on current movement trends, rather than exhaustively preparing for every possible scenario, thereby reducing the burden on prediction accuracy.
Data Source
AI summary
A communication system includes: a plurality of roadside units installed in respective areas that acquires travel information about a vehicle through radio communication; a first terminal connected to the plurality of roadside units; and a server that executes control as a control plane to acquire the travel information from the roadside unit, predict the roadside unit belonging to the plurality of roadside units and installed in an intended area where the vehicle is predicted to travel and predict arrival time at the intended area based on the acquired travel information, and manage communication through the roadside unit and the first terminal so as to construct a communication path between the predicted roadside unit and the first terminal before the arrival time.