RF Transceiver Testing via Simultaneous Multi-Channel Transmission
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Solution Overview
Problem
Testing of low power RF data packet signal transceivers, such as Bluetooth Low Energy devices, is complex and time-consuming due to the need for establishing a wireless communication link without a conductive signal path or wireless control channel, and the uncertainty of which channel the DUT will transmit on, delaying test time and requiring specific coding.
Innovation Solution
A method where a tester transmits data packets simultaneously across all available channels during the communication link initiation sequence, ensuring a proper DUT response, without the need for device-specific driver or testing software, by using advertisement, scan request, and scan response packets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wireless testing is performed without a conductive signal path or wireless control channel, then the device can be tested in its final encapsulated state, but the testing becomes complex and time-consuming due to the need to establish a wireless communication link
Solution Approach 1:
The DUT's own wireless communication capabilities are utilized to perform self-testing. The device under test uses its built-in advertisement and scan response functions to communicate test data back to the tester, eliminating the need for external control channels or conductive paths. This allows the device to test itself in its final encapsulated state without adding complexity to the testing setup.
2Measurement precision
If the tester waits to determine which channel the DUT will transmit on, then the testing can be accurate, but the test time is significantly delayed
Solution Approach 1:
The tester performs preliminary actions by transmitting scan request packets on all possible advertising channels simultaneously before the DUT has a chance to select and transmit on a specific channel. This preliminary multi-channel transmission ensures that the tester will receive a response regardless of which channel the DUT chooses, eliminating the need to wait and determine the channel in advance.
Solution Approach 2:
The testing method dynamically adapts to the DUT's random channel selection by using a wideband receiver that can detect packets across multiple channels. Instead of using a fixed single-channel approach, the system dynamically monitors all advertising channels (37, 38, 39) simultaneously, allowing the tester to capture the DUT's transmission wherever it occurs without delay.
3Ease of operation
If device-specific driver software and testing software are used to control the DUT, then the testing can be performed, but the testing requirements and costs increase
Solution Approach 1:
The testing method uses universal Bluetooth Low Energy packet types (advertisement packets, scan request packets, and scan response packets) that are defined by the Bluetooth specification and can be used with any BLE device. This universal approach eliminates the need for device-specific driver software or custom testing software, as the standard packet exchange protocols work across all BLE devices without modification.
Data Source
AI summary
Method for testing a radio frequency (RF) data packet signal transceiver device under test (DUT) including communicating via each one of multiple available signal channels. Data packets exchanged between a tester and DUT as a normal part of a communication link initiation sequence are exchanged in such a manner that the tester transmits via all available channels simultaneously, thereby ensuring that a properly working DUT will always transmit in response. For example, in the case of a Bluetooth low energy transceiver, advertisement, scan request and scan response data packets can be used in such manner.