Directional Antenna Selection for Vehicle Message Relay
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Solution Overview
Problem
Existing vehicle-to-vehicle communication systems experience transmission delays due to computational processing in servers for determining distribution areas and selecting transmission targets, particularly with unicast transmissions.
Innovation Solution
A message relay apparatus with directional antennas and an antenna selection mechanism based on setting information to optimize message transmission paths, reducing delays by selecting the appropriate antenna for message distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the server determines the distribution area and selects transmission targets using computational processing, then the information can be accurately distributed to the correct vehicles, but transmission delay increases
Solution Approach 1:
The system performs preliminary actions by having vehicles report their location information to the base station in advance. The base station stores this location information and uses it immediately when hazardous event information needs to be distributed, eliminating the need for computational processing to determine distribution areas and select transmission targets at the time of event occurrence.
2Reliability
If unicast transmission is used to send hazardous event information to specific vehicles, then the information reaches the intended recipients, but transmission delay increases due to execution order constraints
Solution Approach 1:
The system segments the transmission process by dividing vehicles into multiple groups based on their location information and the direction of hazardous event occurrence. The base station transmits information to each group simultaneously through different antennas, rather than sequentially transmitting to individual vehicles, thereby reducing overall transmission delay while maintaining reliable delivery.
3Area of stationary object
If multiple antennas are used for message transmission, then the coverage area increases, but the complexity of antenna selection and configuration increases
Solution Approach 1:
The system applies local quality by assigning specific transmission directions to specific antennas. When hazardous event information needs to be distributed, the base station selects only the antenna that corresponds to the direction where the hazardous event occurred, rather than using all antennas. This reduces the complexity of antenna selection while maintaining wide coverage capability.
Data Source
AI summary
A message relay apparatus includes: a first antenna that has a directivity in a first direction; a second antenna that has a directivity in a second direction different from the first direction; a reception part that can receive a message from a first mobile body, the message being directed to a second mobile body and including distribution request area information; an antenna selection part that selects a selection antenna from the first antenna and the second antenna on a basis of setting information, the setting information defining a relationship between a distribution request area indicated in the distribution request area information and an antenna to be selected as the selection antenna; and a transmission part that transmits the message received by the reception part using the selection antenna.