Wireless Terminal Preamble Detection for Power Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In existing wireless communication systems, terminal devices that receive an activation instruction frame often transition to an activated state unnecessarily, leading to increased power consumption as they must detect and confirm the payload to determine if they are the target, even if they are not.
Innovation Solution
Implementing a wireless communication system where terminal devices detect the activation instruction frame at a longer interval than its transmission and only transition to an activated state upon confirming a matching preamble signal sequence, reducing unnecessary state transitions and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminal devices transition to activated state upon detecting activation instruction frame, then they can receive and process data, but power consumption increases due to unnecessary state transitions for non-target devices
Solution Approach 1:
The terminal device performs preliminary action by detecting the preamble signal before fully transitioning to the activated state. The preamble detection occurs in a low-power intermediate state, allowing the device to identify activation instructions without committing to full activation. Only devices that detect their matching preamble signal proceed to the activated state, eliminating unnecessary power consumption for non-target devices while maintaining reliable data reception for target devices.
2Measurement precision
If terminal devices detect and confirm payload contents to determine activation target, then activation accuracy is ensured, but detection time and power consumption increase
Solution Approach 1:
The activation instruction frame is segmented into two distinct parts: a preamble signal and a payload. The preamble signal contains identification information that can be quickly detected and matched by terminal devices. Terminal devices only need to detect and compare the preamble signal to determine if they are the activation target, without needing to process the entire payload. This segmentation enables rapid identification with high accuracy while minimizing detection time and power consumption.
3Reliability
If terminal devices monitor all frequency channels at short intervals, then activation instruction detection is reliable, but power consumption increases
Solution Approach 1:
The terminal device employs periodic action by monitoring frequency channels at extended intervals rather than continuously. The device wakes up at predetermined intervals to detect preamble signals across frequency channels, then returns to sleep mode. This periodic monitoring maintains reliable detection capability for activation instructions while dramatically reducing power consumption compared to continuous monitoring, as the device remains in low-power state for most of the time.
Data Source
AI summary
An aspect of the present invention provides a wireless communication system including: one or more terminal devices that transitions between a first state in which a wireless signal can be intermittently detected and a second state in which a wireless signal can be transmitted and received; and a gateway device that transmits an instruction frame instructing the one or more terminal devices to transition to the second state at a predetermined transmission interval. Each of the one or more terminal devices includes: an instruction frame detector that detects the instruction frame at a detection interval longer than an interval at which the gateway device transmits the instruction frame; a preamble signal detector that detects a preamble signal at a predetermined time interval and a predetermined frequency channel when the instruction frame is detected; and a control unit that causes a subject terminal device to transition from the first state to the second state based on a detection result of one or more preamble signals in one or more frequency channels.