Sleepy Node Channel Hopping Sync With Low-Power Wake Timing
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Solution Overview
Problem
IEEE 802.15.4e does not provide a solution for sleepy node device operation in asynchronous channel hopping networks, requiring sleepy nodes to remain awake to maintain hopping sequences, which contradicts the need for low power consumption.
Innovation Solution
Sleepy nodes utilize a real-time clock to track the coordinator's hopping sequence during sleep, changing their receive channel upon waking and communicating this change to the coordinator, allowing them to synchronize without maintaining their own hopping sequence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sleepy nodes remain awake to maintain hopping sequences in asynchronous channel hopping networks, then network compatibility and synchronization are improved, but power consumption increases
Solution Approach 1:
The coordinator node pre-calculates and stores the hopping sequence information before the sleepy node needs to communicate. When the sleepy node wakes up, it can immediately synchronize by retrieving pre-computed hopping sequence data from the coordinator, eliminating the need to maintain its own hopping sequence during sleep periods and reducing power consumption while maintaining network compatibility
Solution Approach 2:
The coordinator node acts as an intermediary that maintains the hopping sequence information and provides it to sleepy nodes upon request. Instead of each node maintaining its own hopping sequence, the coordinator serves as a central repository and synchronizer, allowing sleepy nodes to remain powered down while the coordinator manages the hopping sequence data and provides it when needed
2Measurement precision
If sleepy nodes maintain their own hopping sequence, then synchronization accuracy is improved, but device complexity increases
Solution Approach 1:
The hopping sequence maintenance function is extracted from the sleepy nodes and centralized in the coordinator node. Sleepy nodes no longer need to maintain their own hopping sequences, reducing their computational burden and device complexity. The coordinator node assumes responsibility for generating, storing, and providing hopping sequence information to all nodes, including sleepy nodes
3Productivity
If sleepy nodes stay awake for channel hopping, then network throughput is improved, but power consumption increases
Solution Approach 1:
The coordinator node pre-calculates the optimal hopping sequence and timing information before sleepy nodes need to transmit or receive data. This allows sleepy nodes to remain in low-power state until precisely when they need to communicate, maximizing their sleep duration while ensuring they can synchronize and participate in network throughput activities when activated
Data Source
AI summary
A storage medium stores instructions that, when executed by a processor, instruct the processor to receive, via a transceiver, a first frame from a wireless device and determine a reception time stamp of the first frame. The instructions include instructions to determine a first timing position of the wireless device within a hopping sequence; and after receiving the first frame, instruct an electronic device comprising the non-transitory computer readable storage medium to transition to a low power mode. The instructions include instructions to after the electronic device transitions to the low power mode, instruct the electronic device to transition to an active mode and after the electronic device transitions to the active mode, determine a listening channel of the wireless device based on the hopping sequence, the reception time stamp, and the first timing position, and to transmit, via the transceiver, a second frame in the listening channel.