ZigBee Touchlink Receiver Intermittent Channel Switching
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Solution Overview
Problem
The existing network discovery procedures for ZigBee Light Link (ZLL) networks interfere with each other, causing failures in touchlink commissioning, as devices need to scan multiple channels for MAC association while touchlinking requires devices to stay on a fixed channel, leading to user frustration and reduced product quality.
Innovation Solution
Implementing an intermittent switching mode that allows a device to listen on a predetermined channel for a specific duration to receive scan request commands, enabling concurrent network discovery and touchlinking without interference, by adapting the network discovery process to initiate sequential searches over primary and secondary channels and repeating the listening mode to ensure receipt of scan requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a device performs network discovery by scanning multiple channels for MAC association, then the device can find and join an open network, but the device cannot simultaneously receive scan request commands for touchlinking on a fixed channel
Solution Approach 1:
The device implements periodic channel switching during network discovery, alternating between scanning channels and listening on the fixed touchlink channel. This periodic action allows the device to perform both network discovery and touchlink reception without permanent conflict, resolving the contradiction by making the channel usage time-dependent rather than mutually exclusive
Solution Approach 2:
The device dynamically adjusts its channel behavior based on the operational phase - switching between network discovery mode (scanning multiple channels) and touchlink mode (listening on fixed channel). This dynamic adaptation allows the system to flexibly handle both functions, resolving the contradiction through state-dependent channel allocation
2Reliability
If a device stays on a fixed channel for touchlinking, then touchlink commissioning can be performed reliably, but the device cannot perform network discovery by scanning multiple channels
Solution Approach 1:
The device implements periodic interruptions of the fixed channel listening to perform brief channel scans for network discovery. This periodic action ensures that touchlink reliability is maintained while periodically enabling network discovery capability, resolving the contradiction through time-multiplexed operation
Solution Approach 2:
The device dynamically switches between touchlink listening state and network discovery scanning state based on operational requirements. This dynamic behavior allows the system to prioritize touchlink reliability when needed while maintaining network discovery capability, resolving the contradiction through adaptive state management
3Productivity
If network discovery and touchlinking procedures are executed concurrently, then both functions can be performed, but the procedures interfere with each other causing failures
Solution Approach 1:
The device uses periodic time-multiplexed operation where network discovery scans and touchlink listening are separated into alternating time slots. This periodic scheduling prevents simultaneous execution conflicts while maintaining both functionalities, resolving the contradiction by eliminating temporal overlap between interfering procedures
Solution Approach 2:
The device segments the commissioning process into distinct phases - network discovery phase and touchlink phase - preventing concurrent execution of interfering procedures. This segmentation resolves the contradiction by ensuring that only one procedure active at a time, eliminating interference while maintaining overall commissioning functionality
Data Source
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AI summary
The present invention relates to an apparatus, method, and computer program product for controlling network discovery of a wireless mesh network, wherein a modified implementation of the network discovery process is suggested. For a touchlink target device, it is sufficient to receive one of all scan request commands that a touchlink initiator node broadcasts for device discovery on a predetermined channel. It is thus enough for the touchlink target device to intermittently switch its receiver to the predetermined channel for a specific duration to receive at least one of those scan command commands.