ZE Receiver Cell Reselection Under Energy Harvesting Limits
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Solution Overview
Problem
Existing cellular network technologies are not suitable for user devices equipped with passive zero-energy (ZE) receivers, as they struggle to efficiently perform cell measurements and cell re-selection procedures while maintaining low power consumption.
Innovation Solution
A wireless transmit/receive unit (WTRU) operating in idle mode uses a zero-energy (ZE) receiver to detect and harvest energy from ZE reference signals, calculating energy consumption and switching to a Uu interface idle mode operation if energy harvesting is insufficient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing cell measurement and cell (re-) selection procedures are applied to user devices with passive receivers, then cell selection functionality is achieved, but power consumption increases significantly
Solution Approach 1:
The system segments the receiver functionality into two distinct parts: a passive zero-energy receiver for detecting wake-up signals and harvesting energy, and a main transceiver for full communication operations. This segmentation allows the device to perform essential functions with minimal power consumption while maintaining full capability when needed.
Solution Approach 2:
The passive receiver performs preliminary actions by detecting wake-up signals and harvesting energy before the main transceiver is activated. This preliminary energy harvesting enables the main transceiver to be turned on only when necessary, reducing overall power consumption while ensuring cell selection functionality is available.
2Use of energy by moving object
If the main transceiver remains off to maintain low power consumption, then energy efficiency is improved, but the device cannot perform tracking area update procedures
Solution Approach 1:
The passive receiver serves itself by autonomously detecting wake-up signals and harvesting energy without requiring the main transceiver to be active. This self-service capability allows the device to maintain energy efficiency while still being able to initiate tracking area update procedures when the main transceiver is activated based on detected signals.
3Measurement precision
If the passive receiver operates continuously to enable cell measurements, then measurement capability is maintained, but energy harvesting becomes insufficient
Solution Approach 1:
The system employs periodic action by activating the main transceiver only when wake-up signals are detected, rather than operating continuously. The passive receiver periodically monitors for wake-up signals and harvests energy, maintaining cell measurement capability while ensuring sufficient energy harvesting by limiting active operation to necessary intervals.
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 allows WTRUs with passive receivers to efficiently perform cell measurements and cell re-selection while maintaining low power consumption, thereby extending battery life and reducing network interference.
Implementation Method 1
such a device may harvest energy from the received RF waveform to run the necessary circuitry to process received signals
Data Source
AI summary
Approaches for idle mode operations for wireless transmit/receive units (WTRUs) with zero-energy (ZE) receivers are disclosed herein. A WTRU operating in idle mode, may receive using the main transceiver over a Uu interface, an energy harvesting (EH) configuration for use over a ZE air interface. The main transceiver may be turned off, and the ZE receiver as part of a ZE idle mode operation, may detect, over the ZE air interface, and harvest energy from ZE reference signals. The WTRU may calculate an amount of energy harvested from the ZE reference signals over a first time period. The WTRU may calculate a ZE idle mode operation energy consumption over the first time period. On a condition that the ZE idle mode operation energy consumption is greater than the harvested energy, the main transceiver may be turned on and the WTRU may enter a Uu interface idle mode operation.