Dynamic Map Relay During Fallback Handover for Level 4 Driving
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Solution Overview
Problem
In Level 4 automated driving systems, communication interruptions during base station handover lead to loss of dynamic map information, affecting the performance of automated driving, as existing techniques fail to ensure continuous dynamic map updates during fallback operations.
Innovation Solution
An application server delivers dynamic map information to vehicles via a first base station and a communication device capable of receiving the information from the first base station during fallback operations, using sidelink communication to relay dynamic information between mobile objects, ensuring continuous map updates during handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle performs base station switching by handover under fallback operation, then communication continuity is maintained, but dynamic map information is lost during handover timing
Solution Approach 1:
The system predicts handover timing in advance by monitoring base station signal levels and determines the timing when dynamic map information will be lost. This preliminary identification of the problem timing allows the system to prepare compensatory measures before the actual information loss occurs.
Solution Approach 2:
A communication device acts as an intermediary to relay dynamic map information from the application server to the vehicle. This intermediary maintains a buffer of dynamic map information and provides it to the vehicle during handover periods when direct communication is interrupted, thereby preventing information loss.
2Reliability
If redundant sessions are set up to avoid communication quality deterioration, then communication reliability is improved, but device complexity and resource consumption increase
Solution Approach 1:
The communication device serves as a mediator that simplifies the communication architecture during handovers. Instead of requiring the vehicle to maintain complex redundant sessions with multiple base stations, the communication device receives and buffers dynamic map information from the application server and delivers it to the vehicle, reducing the complexity of session management while ensuring continuous information delivery.
3Reliability
If the vehicle lowers the service level of travel assistance control during handover, then automated driving performance is maintained, but communication resource usage is reduced
Solution Approach 1:
The communication device maintains a buffer of dynamic map information received from the application server and provides this buffered information to the vehicle during handover periods. This allows the vehicle to maintain Level 4 automated driving performance without losing dynamic map updates, as the intermediary ensures continuous information supply even when direct communication is interrupted.
Solution Approach 2:
The communication device pre-receives and buffers dynamic map information before handover occurs. This preliminary accumulation of information ensures that the vehicle has access to up-to-date dynamic map data during and after handover, maintaining automated driving performance without requiring continuous real-time communication.
Data Source
AI summary
An application server delivers dynamic map information to a mobile object that receives the dynamic map information, the dynamic map information being information of a dynamic map that is used for execution of fully automated driving under a specific condition. When the mobile object executes a handover from a base station capable of transmitting the dynamic map information in a first area to a base station capable of transmitting the dynamic map information in a second area, in a case where the mobile object is in fallback operation in which simultaneous communication with the base stations is unavailable, the application server delivers the dynamic map information to the mobile object via the base station and a mobile object capable of receiving the dynamic map information from the base station.