Ambient IoT Power Control for Reliable Uplink Transmissions
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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 monitoring bandwidth, and controlling transmit power through energizing signals and DL control signaling to manage interference and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If devices with different energy storage levels share the same communication resources, then system resource utilization is improved, but power imbalance and interference occur leading to unreliable UL transmissions
Solution Approach 1:
The patent applies local quality by enabling devices to have different transmission power levels based on their individual energy storage capabilities. High-energy devices can transmit at higher powers while low-energy devices use lower powers, allowing each device to operate optimally for its local conditions rather than being constrained to a uniform power level for all devices in the system.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting transmission power as a controllable parameter. The network can modify power levels based on device energy storage status, and devices can adapt their transmission power to match their available energy, thereby resolving power imbalance issues while maintaining system resource utilization efficiency.
2Reliability
If devices transmit at higher power to ensure reliable communication, then transmission reliability is improved, but power consumption increases reducing operational lifetime
Solution Approach 1:
The patent uses parameter changes to dynamically adjust transmission power levels. Devices can transmit at lower power when energy storage is limited, extending operational lifetime, and increase power when energy is available to ensure reliable transmissions, thus optimizing the trade-off between reliability and duration.
Solution Approach 2:
The patent implements dynamics by making transmission power adjustable rather than fixed. Power levels can change based on real-time conditions including device energy storage status and communication requirements, allowing the system to adaptively balance between extending operational lifetime and ensuring transmission reliability.
3Use of energy by moving object
If monitoring bandwidth is reduced to save power, then power consumption is reduced extending operational lifetime, but detection capability deteriorates
Solution Approach 1:
The patent applies periodic action by implementing discontinuous monitoring where devices monitor the downlink signal at specific intervals rather than continuously. This periodic monitoring reduces the total energy consumed by the monitoring function while still providing sufficient detection capability to identify available resources and transmission opportunities.
Solution Approach 2:
The patent uses partial action by having devices monitor only a portion of the available bandwidth rather than the entire spectrum. This selective monitoring reduces power consumption while maintaining adequate detection capability for the resources that need to be monitored, accepting that some bandwidth areas may not be monitored as thoroughly.
Data Source
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.