V2X CAM Aggregation via Uu Interface
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In scenarios where Uu interface capable vehicles and non-capable vehicles coexist, there is a need for a method to determine which vehicle should collect and report information about surrounding vehicles to a Road Side Unit (RSU) or a central system.
Innovation Solution
A V2X communication method where a Uu interface capable vehicle transmits Cooperative Awareness Messages (CAM) information by aggregating data from surrounding vehicles through both Uu and ITS-G5 interfaces, and then uploads this aggregated information to a base station using the Uu interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each vehicle transmits its own CAM information independently, then every vehicle maintains its own situation awareness, but the overall system generates redundant data transmission and increases network load
Solution Approach 1:
The patent combines multiple CAM information messages from different vehicles into a single aggregated message. The base station collects CAM information from multiple vehicles and merges them into one consolidated message that contains information about all vehicles in the area, thereby reducing redundant transmissions and lowering network load while maintaining complete situation awareness.
Solution Approach 2:
The aggregated CAM message serves multiple vehicles simultaneously by containing information about all vehicles in the area. Instead of each vehicle receiving individual messages, a single universal message provides situation awareness for all participating vehicles, improving system efficiency.
2Loss of information
If Uu interface capable vehicles aggregate and upload CAM information from surrounding vehicles, then information coverage for non-Uu vehicles is improved, but the complexity of the communication protocol increases
Solution Approach 1:
The base station acts as an intermediary that receives CAM information from Uu interface capable vehicles and aggregates it with information from other sources. This intermediary function allows non-Uu vehicles to have their information propagated through the Uu interface without requiring complex protocol changes in the vehicles themselves, as the aggregation logic is centralized at the base station.
Solution Approach 2:
The system creates a consolidated copy of CAM information that includes data from both Uu and non-Uu vehicles. Instead of requiring non-Uu vehicles to directly use the Uu interface, their information is copied into the aggregated message structure that can be transmitted through the Uu interface, effectively extending coverage without increasing vehicle complexity.
3Loss of information
If multiple vehicles transmit CAM information simultaneously, then comprehensive situation awareness is achieved, but channel congestion and collision probability increase
Solution Approach 1:
Multiple individual CAM transmissions are merged into a single aggregated message at the base station. This combining approach maintains comprehensive situation awareness by including information from all vehicles while eliminating the channel congestion that would result from simultaneous independent transmissions by each vehicle.
Data Source
AI summary
The present invention provides a method for transmitting a plurality of pieces of CAM information in a V2X system. More specifically, the method, which is to be performed by a vehicle, includes: a step for transmitting a first message, including first information indicating whether a plurality of pieces of CAM information can be combined, to a base station through a first interface; a step for receiving, from the base station, a second message requesting that the plurality of pieces of CAM information be combined and transmitted; a step for receiving the plurality of pieces of CAM information from nearby vehicles through a second interface; and a step for transmitting a third message including the plurality of pieces of CAM information to the base station through the first interface.