Wireless Meter Link Management via Urgency-Based Downlink Prioritization

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Solution Overview

Problem

Dedicated meter reading systems face challenges in energy-efficient communication over long periods without battery recharging, while also managing interference and congestion within the limited duty cycle of license-free ISM radio bands.

Innovation Solution

A method for link management in wireless communication between measuring devices and data collection units, which involves sending uplink data frames with time-limited access opportunities, updating a counter value for unused access opportunities, and transmitting urgency indicators to prioritize downlink frames based on the counter value.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If dedicated meter reading systems use license-free ISM radio bands for wireless communication, then transmission power and bandwidth can be limited by regulations, but the duty cycle is strictly limited to a maximum of 10% or less

Engineering Contradiction:

Improvetransmission powerVSAvoidduty cycle

Core Design Contradiction:

PowerVSDuration of action of moving object

Solution Approach 1:

The system performs preliminary actions by sending uplink data frames that provide time-limited access opportunities for downlink frames. This allows the system to prepare and schedule communications in advance, ensuring that downlink transmissions occur within the limited duty cycle window while maintaining reliable communication with measuring devices.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements self-service through autonomous transmission where measuring devices autonomously determine transmission timing and the data collection unit autonomously manages the limited downlink duty cycle. This self-organizing approach optimizes communication within regulatory constraints without requiring centralized coordination overhead.

Inventive Principle:

Principle #25Self-service

2Reliability

If the data collection unit sends downlink frames to all measuring devices, then communication coverage is complete, but interference and congestion increase in the frequency bands

Engineering Contradiction:

Improvecommunication coverageVSAvoidinterference and congestion

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The system applies local quality by providing individualized access opportunities to each measuring device based on its specific needs and channel conditions. Instead of uniform communication patterns, each device receives tailored downlink frames within its allocated time windows, reducing overall network congestion while maintaining complete coverage.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The communication medium is segmented into time-limited access opportunities for different measuring devices. By dividing the downlink transmission into discrete, scheduled time windows rather than continuous transmission, the system reduces interference and congestion while ensuring all devices receive necessary communications.

Inventive Principle:

Principle #1Segmentation

3Loss of information

If the measuring devices transmit frequently to ensure data collection, then data freshness is improved, but energy consumption increases reducing battery life

Engineering Contradiction:

Improvedata freshnessVSAvoidenergy consumption

Core Design Contradiction:

Loss of informationVSUse of energy by moving object

Solution Approach 1:

The system implements periodic action through scheduled uplink data frame transmissions at optimized intervals. Measuring devices transmit data frames periodically rather than continuously, and the data collection unit provides downlink frames during scheduled access opportunities, maintaining data freshness while minimizing energy consumption from frequent transmissions.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentEP4268513B1Method for wireless communication in meter reading systems

Publication Date: 2025.01.22 KAMSTRUP

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AI summary

The present disclosure relates to a method for link management for wireless communication between - a plurality of measuring devices (7), wherein each of the measuring devices (7) is installed to measure or detect a value at a respective utility installation, and - at least one data collection unit (5) for collecting data from the plurality of measuring devices (7), wherein the method comprises: - sending uplink data frames from at least one of the measuring devices (7) to the data collection unit (5), - providing by at least some of the uplink data frames a time-limited access opportunity (AO) for receiving downlink frames from the at least one data collection unit (5), - updating a counter value (FC) in the at least one of the measuring devices (7) by adjusting the counter value (FC) for each non-used or unsuccessfully used access opportunity (AO), - transmitting an urgency indicator to the at least one data collection unit (5) by at least some of those uplink data frames that provide an access opportunity (AO), wherein the urgency indicator depends on the counter value (FC), - sending downlink frames from the data collection unit to the at least one of the measuring devices (7) according to a prioritization scheme being based on the urgency indicator.