Energy-Harvesting WTRU Off-Time Scheduling for Data Continuity
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing power consumption and data transfer during energy harvesting (EH) operations, particularly in maintaining intermittent connections due to battery shortages.
Innovation Solution
A wireless transmit/receive unit (WTRU) associated with EH is configured to send a request for a requested off time, allowing it to enter a lower power operation. The WTRU receives a response with information on the off length of time, configured grant resources, and their validity time, enabling it to transmit a power recovery indication when conditions are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the WTRU enters lower power operation to harvest energy, then energy consumption is reduced, but data transmission is interrupted
Solution Approach 1:
The network pre-configures grant resources and validity time before the WTRU enters lower power operation. This preliminary configuration ensures that when the WTRU returns from energy harvesting, it can immediately resume data transmission without delay, resolving the contradiction between energy saving and continuous data transmission
Solution Approach 2:
The system implements periodic operation cycles where the WTRU alternates between active transmission mode and lower power harvesting mode. The network manages these periodic transitions by configuring off duration and validity time, allowing the WTRU to harvest energy periodically while maintaining overall data transmission productivity
2Loss of energy
If the WTRU stops or pauses UL transmission and DL reception to perform EH, then energy is harvested, but communication continuity is lost
Solution Approach 1:
The network provides preliminary configuration of configured grant resources and validity time before the WTRU pauses transmission. This ensures that when the WTRU resumes communication after energy harvesting, the communication continuity is maintained without interruption or data loss
Solution Approach 2:
The WTRU sends an indication message to the network when it has sufficient energy to resume transmission. This feedback mechanism allows the network to track the WTRU's energy status and maintain communication continuity by knowing when the WTRU will be available again
3Loss of information
If the WTRU transmits data immediately when energy is available, then data loss is prevented, but power consumption increases
Solution Approach 1:
The network pre-configures grant resources with validity time before the WTRU needs to transmit data. This allows the WTRU to transmit data immediately when energy is available without waiting for network scheduling, preventing data loss while managing power consumption through pre-planned resource allocation
Solution Approach 2:
The system dynamically adjusts the WTRU's transmission behavior based on energy availability. The WTRU monitors its energy status and transmits data when sufficient energy is available, otherwise it enters lower power mode. This dynamic adaptation prevents data loss while optimizing power consumption
Data Source
AI summary
Systems, methods, and instrumentalities are described herein for data transfer with energy harvesting (EH). EH may offer zero-energy consumption data communication. EH may impose intermittent connection drops due to battery shortage. If a certain condition is met (e.g., battery shortage), the RRC state or DRX/DTX configuration may be switched and data transfer operation may be suspended. EH may be performed to charge the battery/capacitor of the WTRU in the changed RRC state (e.g., new RRC state) or in a changed DRX/DTX operation (e.g., new DRX/DTX operation). If the state is transitioned or the DRX/DTX configuration is changed, protocol times (e.g., via all protocol timers) may be suspended and the user data maintained so that the transmitter and the receiver entities may resume data communication without any data loss or with very small loss of data.