Vehicle Device Antenna Direction Information Signal Source Identification
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Solution Overview
Problem
In bidirectional wireless communication systems, particularly in Bluetooth Low Energy (BLE) technology, there is a challenge in accurately determining the transmission source of signals between a vehicle device and a portable device due to potential signal interference or loss, leading to erroneous identification of the signal source.
Innovation Solution
The implementation of a vehicle device with a main antenna and multiple sub-antennas, which generates and transmits communication frames with direction information, allowing the determination unit to accurately identify the transmission source by distinguishing between communication frames sent in different directions using unique sequence numbers (NESN and SN) within the communication frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If bidirectional wireless communication is implemented between vehicle device and portable device, then convenience of operation is improved, but reliability of transmission source identification deteriorates due to signal interference or loss
Solution Approach 1:
The patent implements a feedback mechanism where communication direction information is embedded in each communication frame and acknowledged by the receiving device. The vehicle device transmits first direction information indicating the communication direction, and the portable device responds with second direction information, creating a closed-loop feedback system that confirms proper signal reception and identification.
Solution Approach 2:
The patent introduces communication direction information as an intermediary element that mediates the identification of transmission sources. This direction information acts as a marker or tag embedded in communication frames, enabling the receiving device to distinguish whether a signal was transmitted in the first direction (vehicle to portable) or second direction (portable to vehicle), thereby resolving the reliability issue.
2Measurement precision
If communication direction information is embedded in communication frames, then measurement precision of transmission source is improved, but device complexity increases
Solution Approach 1:
The patent segments the communication frame into distinct functional components, with communication direction information as a separate embedded element. This segmentation allows the direction information to be independently processed and identified without complicating the overall communication protocol, as it can be extracted and evaluated as a discrete component within the frame structure.
Solution Approach 2:
The patent utilizes parameter changes by embedding communication direction information that indicates different states (first direction vs. second direction). This parameter-based approach allows the receiving device to determine transmission source by evaluating the direction parameter value, providing a simple and efficient method for identification without requiring complex analytical processing.
Data Source
AI summary
The present disclosure provides a vehicle device that performs bidirectional wireless communication with a communication device. The vehicle device includes a main antenna and at least one sub-antenna. The vehicle device generates first direction information, which indicates a direction from the vehicle device to the communication device, and transmits a communication frame that includes the first direction information via the main antenna. The communication device is a portable device, and includes a transmission reception antenna. The communication device generates second direction information, which indicates a communication direction from the communication device to the vehicle device, and transmits a communication frame that includes the second direction information, in response to reception of signal including the first direction information. The vehicle device determines that a transmission source of the communication frame is the communication device when the communication frame received by the sub-antenna includes the second direction information.