Backscatter Wake-Up Radio Scheduling for Energy Efficiency
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Solution Overview
Problem
Conventional wake-up radio systems face challenges in energy efficiency and network throughput due to high energy consumption and channel contention collisions, especially as the number of wake-up radio terminals increases.
Innovation Solution
The implementation of a backscatter wake-up radio system that uses a communication module with a wake-up radio transmitter for low-power channel contention and a main radio transmitter for data transmission, where a processor sets an arbitrary receiving window period and determines a back-off value based on the reception time of a contention signal to minimize energy consumption and prevent collisions during data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional wake-up radio terminals use a secondary transmitter for low-power operation in sleep mode, then energy consumption is reduced, but channel contention collisions increase as the number of terminals increases
Solution Approach 1:
The patent applies preliminary action by having wake-up radio terminals perform channel contention and obtain scheduling information while in low-power sleep mode, before transitioning to active data transmission mode. This allows terminals to secure their transmission slot in advance, eliminating the need for repeated contention when activated, thus reducing collisions while maintaining low energy consumption during idle periods.
2Adaptability or versatility
If the number of wake-up radio terminals increases, then network coverage and utility improve, but channel contention collisions increase
Solution Approach 1:
The patent implements feedback through a base station that receives scheduling requests from multiple wake-up radio terminals, determines optimal scheduling information for each terminal, and feeds back this scheduling information to the terminals. This centralized coordination mechanism allows the network to scale to many terminals while preventing collisions by ensuring each terminal transmits in its assigned time slot without interfering with others.
3Speed
If wake-up radio terminals periodically interrupt sleep mode to check for signals, then communication responsiveness improves, but energy consumption increases
Solution Approach 1:
The patent applies preliminary action by enabling wake-up radio terminals to perform essential channel contention and receive scheduling information while remaining in low-power sleep mode. This preliminary action during sleep mode eliminates the need for periodic wake-ups to check for communication opportunities, thereby maintaining communication responsiveness while minimizing energy consumption by keeping the terminal in sleep mode as long as possible.
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 enables low-power channel contention and high-efficiency data transmission by scheduling data transmission based on a set scheduling order, improving energy efficiency and network throughput while reducing collisions and energy consumption.
Implementation Method 1
Backscatter communication can transmit data without power by reflecting an external signal
Data Source
AI summary
Provided are wake-up radio systems and methods based on backscatter wake-up radio. The wake-up radio method based on backscatter wake-up radio includes setting an arbitrary receiving window period in a window setting period by receiving a beacon signal from a data collection apparatus, transmitting a backscatter response message to the data collection apparatus based on a reception time of a contention signal received from the data collection apparatus in the set receiving window period, in the window setting period, and receiving a wake-up signal from the data collection apparatus in the data transmission period to set as a wake-up period and transmitting data to the data collection apparatus based on a scheduling time according to a backscatter response message.