Ambient IoT Power Control for Reliable Uplink Transmission

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Solution Overview

Problem

Ambient IoT devices face issues with power imbalance and interference due to varying energy storage levels and communication distances, leading to unreliable UL transmissions and high power consumption, especially in scenarios where high-end and low-end devices share the same resources.

Innovation Solution

Implementing closed loop and open loop power control procedures, reducing DL transmission monitoring, and controlling transmit power through energizing signal duration and control signaling to manage interference and power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple ambient IoT devices with different energy storage levels share the same communication resources, then device complexity is reduced and deployment is simplified, but power imbalance and interference occur leading to unreliable transmissions

Engineering Contradiction:

Improvedevice deployment flexibilityVSAvoidtransmission reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies local quality by assigning different power control parameters and resource allocation strategies to devices based on their specific energy storage levels and communication distances. Low-end devices with limited energy use lower transmit powers and shorter transmission intervals, while high-end devices can utilize higher powers and more frequent transmissions, thereby resolving the power imbalance issue while maintaining deployment flexibility

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent dynamically adjusts transmission parameters including power level, transmission interval, and resource block allocation based on device energy storage status and channel conditions. This parameter adaptation ensures that devices operating in the same frequency resources do not create harmful interference while maintaining reliable communications for all device types

Inventive Principle:

Principle #35Parameter changes

2Reliability

If ambient IoT devices continuously monitor DL transmissions to maintain communication reliability, then transmission reliability is improved, but power consumption increases significantly

Engineering Contradiction:

Improvecommunication reliabilityVSAvoiddevice power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic monitoring where ambient IoT devices check for DL transmissions at predetermined intervals rather than continuously. The monitoring frequency is adapted based on device energy storage levels and traffic requirements, allowing low-end devices to reduce monitoring frequency and save power while still detecting important communications

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system enables devices to autonomously adjust their monitoring behavior based on their energy status and communication needs. Low-end devices with limited energy automatically reduce monitoring activities, while devices with sufficient energy can maintain higher monitoring rates, making each device self-adaptive to its power constraints

Inventive Principle:

Principle #25Self-service

3Length of moving object

If high-end ambient IoT devices transmit at high power levels, then communication distance and coverage are improved, but interference to low-end devices increases causing power imbalance

Engineering Contradiction:

Improvecommunication distanceVSAvoidinterference to low-end devices

Core Design Contradiction:

Length of moving objectVSObject-generated harmful factors

Solution Approach 1:

The patent employs feedback mechanisms where the base station monitors received signal strengths from devices at different distances and power levels. Based on this feedback, the base station sends power control commands to high-end devices to adjust their transmit power, ensuring sufficient coverage for distant devices while preventing excessive interference to low-end devices in closer proximity

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent implements dynamic power control where transmit power levels are not fixed but continuously adjusted based on real-time channel conditions, device locations, and interference levels. This dynamic adaptation allows the system to optimize coverage distance while minimizing harmful interference, with power levels changing in response to varying operational conditions

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP4626091A1Apparatus and method for power saving and transmission power control in ambient IoT systems

Publication Date: 2025.10.01 SAMSUNG ELECTRONICS CO LTD

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AI summary

A system and a method are disclosed for power saving and power control in ambient IoT systems. A method performed by an ambient IoT device includes receiving, from a reader, a control indication to trigger a D2R transmission and an indication of a target transmission power; determining if the target transmission power is within a power budget of the ambient IoT device; and in response to determining that the target transmission power is within the power budget of the ambient IoT device, performing the D2R transmission at the target transmission power.