Ambient IoT Interrogation Using Random IDs to Cut Power Drain
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Solution Overview
Problem
Existing Ambient Internet of Things (A-IoT) devices face power depletion issues during multiple interrogations, leading to incorrect information provision to the core network due to excessive energy expenditure, especially when processing unique identifiers.
Innovation Solution
A method where A-IoT devices are powered by an energy harvester and utilize an enhanced interrogation process that reduces message volume and data requirements by selectively sending unique identifiers based on request type, using initial and second messages to manage collisions and determine the number of devices present without requiring full responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If A-IoT devices respond to multiple interrogation messages with full unique identifiers, then the core network receives complete information, but the device power is depleted faster than the energy harvester can replenish it
Solution Approach 1:
The patent applies partial action by having A-IoT devices send only random numbers in the first message instead of full unique identifiers. The core network can then determine the number of devices present without requiring complete device identification data, thus reducing energy consumption while still achieving the discovery objective.
Solution Approach 2:
The patent extracts only the essential information needed for device discovery (random numbers for collision detection and counting) while leaving out the energy-intensive unique identifier transmission. This selective information extraction allows the system to achieve its goal with minimal energy expenditure from the A-IoT devices.
2Measurement precision
If A-IoT devices process and transmit encrypted unique identifiers, then accurate device identification is provided to the core network, but the processing time and energy expenditure increase
Solution Approach 1:
The patent uses disposable random numbers instead of valuable unique identifiers. Random numbers are computationally inexpensive to generate and transmit, and their temporary nature allows the system to achieve device counting functionality without the overhead of secure identifier handling, thus reducing processing time and energy consumption.
3Quantity of substance
If the reader device requests full inventory information from all A-IoT devices, then complete device data is collected, but the system resources and power consumption increase significantly
Solution Approach 1:
The patent implements partial action by having the core network request only the number of devices present rather than complete inventory data. The reader device transmits only random numbers from A-IoT devices, which are sufficient for counting purposes. This approach collects the minimum necessary data (device count) while maintaining high system efficiency by avoiding unnecessary data transmission and processing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach conserves energy in A-IoT devices by minimizing unnecessary processing and message transmission, ensuring accurate information delivery to the core network while extending device operation time.
Implementation Method 1
A-IoT devices face power depletion issues during multiple interrogations... A-IoT devices are powered by an energy harvester
Data Source
AI summary
Method and system for communicating with user equipment, UE, the method comprising the steps of a reader device receiving a request to interrogate one or more UE. In response to the request, the reader device transmitting an initial message to the one or more UE. The one or more UE responding to the initial message by transmitting a first message. The reader device responding to the first message by sending a second message to the one or more UE unless the request received by the reader device to interrogate the one or more UE comprises data indicating that the second message is not required. When a second message is sent by the reader device to the one or more UE, the one or more UE responding to the second message with a third message unless data is received from the reader device by the one or more UE indicating that a response to a second message is not required.