Optical Wireless Access Point Triggered Low Power State
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Solution Overview
Problem
Existing optical wireless communication systems face a tradeoff between energy efficiency and system performance, as methods to reduce energy consumption, such as duty cycling, lead to increased latency and potential performance degradation.
Innovation Solution
The system operates in at least two states: a low power state for detecting optical signals and a normal operation state for establishing high-speed data links. The access point and end point device switch between these states based on the presence of an end point device, reducing unnecessary energy consumption and maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If duty cycling control is used to reduce energy consumption of the access point, then energy efficiency is improved, but average latency increases and system performance degrades
Solution Approach 1:
The access point dynamically switches between low power state and normal operation state based on the presence of end point devices. When no devices are detected, the access point enters low power state to save energy. When devices are detected, it transitions to normal operation state to provide high-speed data links, thus adapting its operational characteristics to real-time conditions and resolving the contradiction between energy saving and performance maintenance.
Solution Approach 2:
The access point performs preliminary detection of end point devices before transitioning to normal operation state. This preliminary action allows the system to prepare for high-speed data transmission only when needed, avoiding unnecessary energy consumption during idle periods while ensuring rapid response when devices are present, thereby balancing energy efficiency with access latency.
2Reliability
If the access point operates continuously in normal operation state, then system performance is maintained, but energy consumption increases
Solution Approach 1:
The access point employs dynamic state management, transitioning between low power state and normal operation state based on detected device presence. This dynamic approach ensures the system maintains high performance reliability when end point devices are present while significantly reducing energy consumption during idle periods, thus resolving the contradiction between continuous performance maintenance and energy efficiency.
Solution Approach 2:
The access point autonomously monitors for end point devices and self-manages its operational state without external control. It automatically transitions to normal operation state when devices are detected and returns to low power state when devices are absent, enabling the system to serve itself in optimizing the balance between performance reliability and energy consumption.
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 balances energy efficiency with access latency, reducing energy waste while maintaining high-speed data link performance, thereby enhancing the overall efficiency and effectiveness of the optical wireless communication system.
Implementation Method 1
an optical wireless communication (OWC) receiver comprising a photodetector device configured to receive light and to produce a detection signal in response to the received light
Data Source
AI summary
High-speed optical communication is very attractive to satisfy high throughput applications. In the meanwhile, it is also desirable to reduce the energy waste resulted from an idle state of the optical transceivers of the communication system. The present invention discloses that both the access point (1200) and the end point device (1100) can operate in at least two different operation states, a normal operation state and a low power state. The low power state is a default state, and the normal operation state is enabled only when a valid trigger is detected. To establish a high-speed optical link (60), the end point device (1100) first sends an optical trigger signal (50) to the access point (1200) in the low power state. The access pint (1200) switches to the normal operation state only when a valid trigger signal is identified after detecting the optical trigger signal (50).