Vehicle Dynamic Map TTL Checks to Cut Redundant Object Uploads
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Solution Overview
Problem
Connected vehicles transmitting redundant object data to a map server leads to unnecessary bandwidth consumption, as multiple vehicles detect the same objects, causing the server to receive redundant information.
Innovation Solution
Implementing a system where vehicles check a dynamic map's time-to-live (TTL) for detected objects and only transmit data if the TTL is close to expiration or if the object is not already on the map, thereby reducing redundant transmissions and conserving bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If every vehicle transmits object data to the map server, then the dynamic map remains accurate and up to date, but communication bandwidth is wasted due to redundant data transmission
Solution Approach 1:
Instead of every vehicle transmitting data for every detected object, only partial transmissions occur: vehicles transmit object data only when the object is new to the map or when existing map data is stale (TTL expired or approaching expiration). This partial action maintains map accuracy while reducing redundant bandwidth consumption.
Solution Approach 2:
The map server pre-assigns time-to-live (TTL) values to objects in the dynamic map, establishing expiration thresholds in advance. Vehicles use this pre-established TTL information to determine whether transmission is necessary, eliminating the need for continuous redundant transmissions and optimizing bandwidth usage.
2Loss of information
If vehicles continuously transmit detected object data, then the map server receives comprehensive updates, but unnecessary redundant data consumes valuable communication resources
Solution Approach 1:
Vehicles perform partial transmissions by sending only those object data packets that are necessary for maintaining map completeness. The TTL mechanism filters out redundant transmissions, ensuring that the map server receives sufficient information to maintain an accurate dynamic map without being overwhelmed by excessive duplicate data.
Solution Approach 2:
The map server provides feedback to vehicles through the dynamic map data it maintains, including TTL information for known objects. Vehicles use this feedback to make intelligent transmission decisions, sending data only when needed to update or refresh map information, thereby optimizing the balance between data completeness and transmission volume.
Data Source
AI summary
A method comprises receiving, at a vehicle system of a vehicle, sensor data from one or more sensors; detecting an object based on the sensor data; determining whether a dynamic map maintained by a remote computing device includes the detected object; upon determination that the dynamic map includes the detected object, determining a remaining time-to-live associated with the detected object based on data associated with the dynamic map; and transmitting data about the detected object to the remote computing device if the determined remaining time-to-live associated with the detected object is less than a predetermined threshold time.