LLDN Power Saving via Coordinator-Managed Sleep States
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Solution Overview
Problem
In Low Latency Deterministic Networks (LLDNs), devices must remain powered on during other devices' time slots even if they do not need to retransmit, leading to unnecessary energy consumption due to the current IEEE 802.15.4 standard's lack of efficient power saving mechanisms.
Innovation Solution
A method is introduced where wireless devices can communicate power save capability information with a coordinator, allowing them to enter a sleep state during inactive periods by receiving a beacon indicating a configuration state and sending configuration status information, enabling the coordinator to direct devices to enter a sleep state without additional command frames, and using a modified LL-beacon frame with a sleep control field to determine sleep durations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices remain powered on during other devices' time slots to ensure reliable data transmission, then transmission reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements dynamic power state transitions for LLDN devices. Devices can switch between active and sleep states based on whether they have data to transmit. The coordinator dynamically manages device states by sending commands to put devices to sleep when no transmission is needed, and waking them up when data needs to be sent. This dynamic adaptation resolves the contradiction by maintaining reliability only when necessary while saving energy during idle periods.
Solution Approach 2:
The patent changes the operational parameters of LLDN devices by introducing configurable power save modes. The coordinator can adjust device states (active, sleep, inactive) based on network conditions and data priority. This parameter change allows the system to optimize between reliability and energy consumption by adjusting device operational states rather than maintaining a fixed powered-on state.
2Reliability
If devices stay awake during all time slots to monitor for retransmission opportunities, then transmission reliability is improved, but device productivity decreases
Solution Approach 1:
The patent segments the monitoring duty among devices by allowing them to sleep during time slots when they are not the active transmitter or retransmitter. Instead of all devices continuously monitoring, each device is assigned specific active periods and can remain inactive during other devices' time slots. This segmentation improves productivity while maintaining reliability through coordinated monitoring.
Solution Approach 2:
The patent implements periodic wake-up and sleep cycles for LLDN devices. Devices wake up at scheduled intervals to check for data or retransmission opportunities, then return to sleep mode. This periodic action pattern allows devices to balance between monitoring for reliability and conserving productivity by not continuously staying awake.
3Use of energy by moving object
If the coordinator sends additional command frames to manage power save modes, then power saving capability is improved, but MAC control overhead increases
Solution Approach 1:
The patent merges the power save management function into existing MAC control mechanisms. The coordinator uses existing MAC frame structures to convey power save commands and status information, combining multiple functions (data transmission, acknowledgment, and power management) into unified communication flows. This merging reduces the need for separate dedicated power management frames, thereby limiting the increase in MAC control overhead.
Data Source
AI summary
Wireless communication in a wireless network comprises a wireless device communicating power save capability information with a coordinator during a discovery state. A beacon that indicates a configuration state is received by the wireless device. Configuration status information is sent to the coordinator. A configuration request is received by the wireless device from the coordinator for entering or exiting the power save mode.