Bluetooth Host Device HCI Inquiry Signal Power Restriction
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Solution Overview
Problem
Conventional Bluetooth communication systems waste time and are inconvenient by detecting and displaying all nearby Bluetooth devices, allowing users to connect only one device at a time, making it difficult to quickly find and connect to the desired device.
Innovation Solution
A device and method that restricts the transmission power of HCI inquiry signals to detect only the nearest Bluetooth device by comparing the intensity of response signals, allowing the host device to connect directly to the device with the strongest signal, thereby reducing unnecessary detection and improving user convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the host device transmits HCI inquiry signals with high transmission power to detect all nearby Bluetooth devices, then the detection range is expanded and more devices can be found, but the connection time is wasted and the user experience deteriorates due to having to manually select from unnecessary devices
Solution Approach 1:
The patent changes the transmission power parameter of HCI inquiry signals dynamically. Instead of using high transmission power to detect all devices, the system uses low transmission power to detect only nearby devices. This parameter change resolves the contradiction by maintaining sufficient detection range for intended devices while avoiding detection of distant unnecessary devices, thus reducing connection time.
Solution Approach 2:
The patent applies partial action by using just enough transmission power to detect the intended nearby device without exceeding the power level that would detect unnecessary distant devices. This partial action approach ensures the detection range is sufficient for the target device while avoiding the excessive detection of unrelated devices, thereby reducing manual selection time.
2Loss of information
If the host device displays all detected Bluetooth devices including unnecessary ones, then complete information is provided to the user, but the ease of operation deteriorates due to difficulty in finding the desired device
Solution Approach 1:
The patent extracts only the necessary device information from the complete set of detected devices. By using low transmission power, the system extracts information only from nearby relevant devices, excluding unnecessary distant devices from the detection list. This extraction principle resolves the contradiction by providing sufficient device information while improving ease of operation through a simplified, more relevant device list.
3Productivity
If the transmission power is restricted to detect only nearby devices, then the connection time is reduced and efficiency is improved, but the detection range is limited and may miss desired devices
Solution Approach 1:
The patent dynamically adjusts the transmission power parameter based on the operational context. For routine connections, low transmission power is used to maximize efficiency and minimize connection time. When needed, the system can increase transmission power to expand detection range and locate desired devices. This adaptive parameter change resolves the contradiction by optimizing connection efficiency while maintaining the capability to detect devices when necessary.
Data Source
AI summary
Disclosed are a device and method for searching and connecting to Bluetooth devices. A Host Device restricts the Bluetooth transmit power below a preset level, so as to limit the transmission range of an HCI inquiry signal output from the Host Device. When two or more Bluetooth devices are detected within the restricted transmit range, the Host Device compares the intensities of response signals received from the Bluetooth devices, and then selects a Bluetooth device having the response signal with the greatest intensity. Next, the Host Device attempts to connect to the selected Bluetooth device and starts to provide Bluetooth services. Thus, it is possible to restrict the Bluetooth devices detected according to the restricted transmission power. Further, the Host Device can connect to the Bluetooth device located at the nearest position, thereby making it possible for a user to easily and conveniently start a Bluetooth device service.