Radio Communication System Active Scan Terminal Detection Speed
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional radio communication systems require a long time to detect other radio communication apparatuses, especially in high-speed vehicle-to-pedestrian communication scenarios, due to sequential scanning of frequency channels.
Innovation Solution
The system employs an active scan terminal that transmits probe request frames across multiple frequency channels without waiting for responses, then waits for a response on a designated response channel, while the passive scan terminal responds after an offset time, allowing for faster detection by superimposing offset and response channel information on the probe request frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sequential scanning of frequency channels is performed to detect other radio communication apparatuses, then detection accuracy is improved, but detection time increases significantly
Solution Approach 1:
The system performs preliminary actions by having the active scan terminal transmit probe request frames to multiple frequency channels in advance without waiting for responses. The passive scan terminal prepares to respond on a predetermined response channel after receiving the probe request, enabling faster mutual detection without sequential channel scanning
Solution Approach 2:
The detection process is segmented into two terminal types with different functions: active scan terminals that initiate probing and passive scan terminals that respond. This segmentation allows parallel operation across multiple frequency channels rather than sequential scanning, reducing overall detection time while maintaining detection accuracy
2Reliability
If the active scan terminal waits for response frames from other radio communication apparatuses before scanning the next frequency channel, then response reliability is improved, but scanning speed decreases
Solution Approach 1:
The passive scan terminal performs preliminary action by being in a ready state to respond on a predetermined response channel. When the active scan terminal transmits a probe request, the passive terminal can immediately respond after the offset time without requiring the active terminal to wait, thus maintaining reliability while improving scanning speed
Solution Approach 2:
A predetermined response channel acts as an intermediary where the passive scan terminal consolidates its response. This allows the active scan terminal to move to the next frequency channel without waiting for responses on each channel, improving scanning speed while the response channel ensures reliable communication
Data Source
AI summary
A radio communication system includes a plurality of radio communication apparatuses including an active scan terminal and a passive scan terminal. After transmitting a probe request frame from one frequency channel, the active scan terminal continuously transmits the probe request frame from other frequency channels without waiting for a response frame from the other radio communication apparatuses, thereafter transmits the probe request frame from a response channel, which is a waiting channel, and waits for a response from the passive scan terminal, and superimposes, on the probe request frame, information concerning an offset time to the response and information concerning the response channel, and, after receiving the probe request frame, after the elapse of the offset time to the response, the passive scan terminal transmits a response frame from a frequency channel designated by the response channel information.