BLE Advertising PDU Type Bypass for Scan Request Interference
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Solution Overview
Problem
Bluetooth Low Energy (BLE) communication between multiple electronic devices can experience interference and connection failures due to simultaneous signal transmissions, leading to increased power consumption and prolonged scanning times.
Innovation Solution
An electronic device employs a new type of advertiser Packet Data Unit (PDU) and bypasses the transmission of scan requests during active scanning, allowing it to differentiate between predefined PDU types and avoid simultaneous transmissions, thereby reducing interference and improving connection success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple electronic devices perform active scanning and transmit scan requests simultaneously, then device discovery capability is improved, but signal interference increases causing connection failures
Solution Approach 1:
The patent implements periodic scanning intervals where devices alternate between transmitting and receiving states. By using duty cycles and time-division multiplexing, scan requests are sent at periodic intervals rather than continuously, allowing other devices to receive without interference. This resolves the contradiction by maintaining discovery capability through periodic actions while reducing simultaneous transmissions that cause interference.
Solution Approach 2:
The scanning process is segmented into distinct time slots and phases. Devices divide the scanning period into multiple segments where different devices take turns being the active transmitter. This segmentation of the scanning timeline ensures that not all devices transmit simultaneously, reducing signal interference while still enabling all devices to perform discovery functions.
2Reliability
If electronic devices continuously transmit scan requests to ensure connection, then connection reliability is improved, but power consumption increases
Solution Approach 1:
Instead of continuous transmission, the patent employs periodic scan request transmission with defined duty cycles. Devices transmit scan requests at specific intervals and remain in low-power listening mode between transmissions. This periodic approach maintains connection reliability by ensuring regular communication attempts while dramatically reducing average power consumption compared to continuous transmission.
Solution Approach 2:
The system implements self-service mechanisms where devices autonomously manage their transmission and listening schedules based on pre-defined protocols. Each device automatically enters sleep mode after transmission and wakes only when needed to receive responses or initiate the next periodic scan, eliminating the need for continuous high-power operation while maintaining reliable connection establishment.
3Loss of time
If scan requests are transmitted frequently to reduce scanning time, then connection speed is improved, but interference between devices increases
Solution Approach 1:
The patent segments the scanning process into coordinated time slots assigned to different devices. By dividing the scanning timeline into discrete segments where each device has designated transmission windows, the system enables frequent scanning attempts across the network while preventing simultaneous transmissions that would cause interference. This segmentation allows rapid connection establishment without the harmful effects of uncoordinated frequent transmissions.
Solution Approach 2:
Devices perform scanning at periodic intervals with synchronized timing across the network. This coordinated periodic action allows the system to achieve fast connection times through regular scanning cycles while the synchronization ensures that not all devices transmit at the exact same moment, thereby reducing signal interference despite the frequent scanning activity.
Data Source
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AI summary
An electronic device is provided. The electronic device includes a communication module supporting communication based on Bluetooth Low Energy (BLE), and a processor operatively coupled to the communication module. The processor is configured to transmit control information to request the communication module to operate in a first mode. Upon receiving an advertising Packet Data Unit (PDU) of predefined types from an external electronic device, the first mode corresponds to a mode of controlling the communication module so that a scan request is transmitted to the external electronic device in response to reception of the advertising PDU of the predefined types. The communication module is configured to receive the advertising PDU from the external electronic device, while operating in the first mode, on the basis of the control information, identify that a type of the received advertising PDU corresponds to a first type distinct from the predefined types, on the basis of a header included in the received advertising PDU, bypass transmission of the scan request on the basis of the identifying, and transmit to the processor an advertising notification for representing that the advertising PDU of the first type has been received.