Onboard Apparatus Communication Control for V2X Data Forwarding
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Solution Overview
Problem
In vehicle-to-vehicle communication systems, when a vehicle with an onboard unit travels outside the communication area of a roadside unit, there is a risk of unnecessary data transmission as the onboard unit may forward information to neighboring units even if they cannot communicate with the roadside unit, leading to data being repeatedly forwarded without reaching its intended destination.
Innovation Solution
The onboard apparatus includes a receiving means to gather surround information from neighboring units about the presence of units within the communication area and a processing means that controls the transmission of communication data based on this information, ensuring that data is only forwarded to units that can communicate with the roadside unit, thereby preventing unnecessary data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the onboard unit transmits information to neighboring onboard units when outside the roadside unit's communication area, then the information can potentially reach the roadside unit through multi-hop communication, but unnecessary data transmission occurs when no neighboring units can communicate with the roadside unit, leading to repeated forwarding without delivery
Solution Approach 1:
The system performs preliminary acquisition of surround information about neighboring onboard units' communication status before initiating data transmission. This allows the transmitting onboard unit to predict whether multi-hop communication can successfully reach the roadside unit, avoiding unnecessary transmission attempts in advance
Solution Approach 2:
The system uses feedback from surround information (communication status of neighboring units) to dynamically control transmission decisions. The transmitting unit adjusts its behavior based on the communication capabilities of surrounding units, ensuring transmission only when delivery is feasible
2Adaptability or versatility
If the onboard unit forwards data to multiple neighboring units, then the data may reach the roadside unit through one of them, but the data is repeatedly forwarded across the network without reaching the destination, causing network congestion and wasted bandwidth
Solution Approach 1:
The system acquires surround information about the communication environment before transmission, allowing the unit to identify which neighboring units can actually reach the roadside unit. This preliminary knowledge prevents blind multi-directional forwarding and reduces information redundancy
Solution Approach 2:
The system applies different transmission strategies to different neighboring units based on their individual communication capabilities with the roadside unit. Instead of uniform forwarding to all neighbors, transmission is selectively directed to units with confirmed communication capability
3Productivity
If the onboard unit transmits communication data when outside the communication area, then the data can be forwarded to the roadside unit if a neighboring unit is within range, but transmission control is insufficient leading to unnecessary transmissions when no neighboring units can communicate with the roadside unit
Solution Approach 1:
The system performs preliminary acquisition of surround information regarding neighboring units' communication status before transmission decisions are made. This advance preparation enables efficient transmission control by pre-identifying viable transmission paths to the roadside unit
Data Source
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AI summary
An onboard apparatus according to the present invention is an onboard apparatus which is installed in each of a plurality of vehicles so as to perform communication between vehicles and communication with a wireless station, comprising: a receiver that receives from neighboring onboard apparatuses, surround information that indicates the presence of onboard apparatuses in a communication area communicable with the wireless station; and, a processor that, upon receiving communication data, transmits the communication data addressed to the wireless station in accordance with the surround information.