Asymmetrical Hail Timing for AMI Network Energy Optimization
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Solution Overview
Problem
In Advanced Metering Infrastructure (AMI) networks, maximizing battery life in DC repeaters is challenging due to the limitations of existing energy storage solutions like Hybrid Layered Capacitors (HLCs) and Electrolytic Double Layer Capacitors (EDLCs, which are expensive and have short energy output durations, making it difficult to efficiently hail listening devices.
Innovation Solution
A method involving varying hail message transmission rates and listening intervals, where a first device transmits hail messages at a first rate and listens for responses at a second, lower rate, optimizing energy use and extending battery life by adjusting the duration and gaps between hail messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If a device listens intermittently with long sniffing windows (e.g., 3 seconds) to save power, then battery life is extended, but the hailing device must transmit more frequently increasing its energy consumption
Solution Approach 1:
The patent implements asymmetrical hailing timing where the first device transmits hail messages at a first rate with longer periods and gaps, while the second device listens at a second rate with shorter periods. This asymmetric arrangement allows the listening device to maintain lower power consumption while the hailing device compensates with optimized transmission timing, resolving the energy consumption imbalance between transmitting and receiving operations
2Reliability
If hail messages are transmitted frequently to ensure reliable detection, then communication reliability improves, but battery life deteriorates due to increased energy consumption
Solution Approach 1:
The patent employs dynamic hailing rates where the first device transmits at a first hailing rate and the second device listens at a second hailing rate, with the system adapting transmission and listening intervals based on network conditions. This dynamic approach maintains reliable communication detection while optimizing battery life by adjusting the frequency of transmissions and listening events according to actual operational needs rather than using fixed high-frequency intervals
3Volume of moving object
If EDLCs are used for energy storage due to their compact size, then device size is reduced, but their short energy output duration makes them unsuitable for hailing operations
Solution Approach 1:
The patent changes the operational parameters of EDLCs by implementing asymmetrical hailing timing with extended gaps between hail message transmissions. The first device transmits hail messages with longer periods and gaps compared to traditional symmetric approaches, allowing EDLCs to discharge energy over extended durations. This parameter change enables EDLCs to maintain their compact size while providing sufficient energy output duration for hailing operations in AMI networks
Data Source
AI summary
A method includes transmitting first hail messages from a first device at a first hailing rate, wherein a first time between beginnings of each consecutive first hail message is a first period, each first hail message transmitted for a first length of time, and a first gap extends between an end of each first hail message and a start of a next first hail message; listening at the first device for a second hail message repeatedly transmitted at a second hailing rate, wherein a second time between beginnings of each consecutive second hail message is a second period, each second hail message transmitted for a second length of time, and a second gap extends between an end of each second hail message and a start of a next second hail message; and performing, at the first device, a channel activity detection of a preamble in the second hail message.