Vehicle Communication Device Adaptive Geocast Forwarding
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Solution Overview
Problem
Existing communication systems face challenges in accurately forwarding packets to vehicles on curved roads due to deviations in the specified transmission areas set by geocast routing techniques, leading to inefficient packet forwarding and potential congestion.
Innovation Solution
A communication device and system that receive packets containing forwarding information based on a reference direction from a transmission source, acquire the running direction of the vehicle, and transmit the packet to the corresponding transmission area set up based on the vehicle's own running direction, allowing for accurate packet forwarding without the need for road trajectory information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If geocast routing technique is used to specify transmission area, then packet forwarding is restricted to reduce congestion, but transmission area deviates from expected area on curved roads
Solution Approach 1:
The patent applies dynamics by making the transmission area specification adaptive to changing road conditions. Instead of using a fixed geocast routing area, the system dynamically adjusts the transmission area based on the curvature of the road and the running direction of vehicles. This allows the transmission area to follow the road trajectory on curved sections while maintaining proper packet forwarding restrictions, resolving the contradiction between forwarding accuracy and operational efficiency.
2Area of stationary object
If forwarding vehicle repeats forwarding of packet, then transmission destination area is enlarged, but communication traffic increases and information transmission becomes inadequate
Solution Approach 1:
The patent applies local quality by making packet forwarding behavior location-dependent. Instead of uniform forwarding to all vehicles in an area, the system identifies vehicles that are actually located on the road trajectory within the transmission area. Only vehicles positioned on the curved road path receive and forward packets, while vehicles outside the road trajectory do not forward. This selective forwarding based on local position quality enlarges the effective transmission destination area while preventing unnecessary traffic increase.
Data Source
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AI summary
An object of the present invention is to forwards a packet corresponding to trajectories of roads without it being necessary to use road trajectory information. A communication device is mounted on a vehicle. The communication device includes a reception section that receives a packet containing forwarding information that represents a transmission area of the packet that is set up based on a reference direction from a transmission source; an acquisition section that acquires a running direction of its own vehicle; and a processing section that transmits the packet containing the forwarding information to at least the transmission area of the packet that has been set up based on the running direction of its own vehicle,