Wake-Up Signal Control for IoT Power Saving
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Solution Overview
Problem
Current wireless communication systems, particularly in IoT applications, face challenges in power saving as devices need to periodically wake up to check for data, leading to inefficiencies and increased power consumption, especially when mobility across cells is required.
Innovation Solution
A control information transmission method and apparatus that uses a secondary module to receive and decode wake-up signals, allowing a terminal device to remain in a sleep state unless specifically instructed to wake up, optimizing operations and reducing unnecessary power usage by carrying control information that indicates state updates, sleep mode transitions, and operations post-wake-up.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If terminal devices periodically wake up to check for data in traditional power saving mechanisms, then devices can receive data notifications, but power consumption increases and access delays occur
Solution Approach 1:
The patent applies preliminary action by having the secondary module pre-configure wake-up conditions, control information formats, and communication parameters before the terminal device enters sleep state. This allows the device to wake up only when necessary with minimal processing delay, reducing both power consumption and access delay simultaneously
Solution Approach 2:
The patent segments the terminal device into a primary module (main processor) and a secondary module (low-power controller). The secondary module handles wake-up signal reception and control information parsing in low-power state, while the primary module remains in deep sleep. This segmentation enables the device to respond to wake-up signals faster without requiring the full system to wake up periodically, thus reducing both power consumption and access delay
2Use of energy by moving object
If terminal devices wake up actively to query data in 802.11ah mechanism, then power saving is improved, but network access efficiency decreases when mobility is required
Solution Approach 1:
The patent introduces control information as an intermediary mechanism that carries wake-up indications, mobility management data, and network access parameters from the network side to the terminal device. This control information allows the device to wake up selectively and access the network efficiently without blind communication attempts, improving both power saving and network access efficiency
Solution Approach 2:
The patent applies preliminary action by pre-configuring the terminal device with mobility management parameters, wake-up conditions, and network access information through control information before the device needs to access the network. This eliminates the need for blind communication attempts and enables fast network access when mobility is required, while maintaining power saving benefits
3Use of energy by moving object
If a low-power-consumption module is added to listen for wake-up signals, then power saving is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the secondary module to perform multiple functions: receiving wake-up signals, parsing control information, managing wake-up timing, and coordinating with the primary module. This multi-functional design reduces the need for separate dedicated components for each function, thereby improving power saving while minimizing the increase in device complexity
Data Source
AI summary
A control information transmission method includes that: a first station sends a wireless signal including control information, where the control information is used for instructing a specified second station in a sleep state to perform one or more of following operations: state update, sleep mode transition, leaving the sleep state, and an operation after leaving the sleep state. A secondary module of the second station receives and decodes a wake-up signal to obtain control information and identity identifier information, and sends the control information and the identity identifier information to a control module; and the control module of the second station determines, according to the identity identifier information, whether the second station is a target second station of the wake-up signal, and parses and completes an operation indicated in the control information.