Wakeup Frame Transmission for M2M Power Management
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Solution Overview
Problem
In Machine-to-Machine (M2M) systems, STAs often inadvertently stay in sleep mode when they should be active or vice versa, leading to inefficient battery usage and communication failures due to independent power-saving mode switching protocols, which complicates management and data transmission.
Innovation Solution
A method involving the transmission of paging and wakeup frames with specific headers and fields to manage power save mode switching, ensuring STAs stay in active mode only when necessary by determining priorities and optimizing communication between STAs and APs, including a waiting time for response and addressing buffered data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If STAs independently switch between power save mode and sleep mode according to their own protocols, then battery management flexibility is improved, but communication reliability deteriorates due to mode mismatches
Solution Approach 1:
The patent implements a feedback mechanism where the AP monitors STA power modes and sends control frames (power save poll frames, wake-up frames) to regulate STA behavior. The AP receives status information from STAs and adjusts power management decisions based on this feedback, ensuring communication reliability while maintaining flexibility.
Solution Approach 2:
The AP acts as an intermediary between multiple STAs, centralizing power management control. Instead of STAs independently managing their own power modes, the AP mediates by receiving power mode indications from STAs and sending control frames to coordinate their sleep and active states, preventing mode mismatches and ensuring reliable communication.
2Use of energy by moving object
If STAs stay in sleep mode to conserve battery power, then energy consumption is reduced, but data transmission efficiency deteriorates due to mode mismatches
Solution Approach 1:
The patent employs preliminary action by having STAs indicate their power mode preferences in advance to the AP before actual data transmission occurs. The AP uses this advance information to proactively send control frames that prepare the network for efficient power management, ensuring that STAs wake up at appropriate times for data transmission while minimizing unnecessary battery consumption.
Solution Approach 2:
The patent implements periodic action through scheduled wake-up intervals and periodic transmission of control frames between AP and STAs. STAs periodically wake up to check for buffered data, and the AP periodically sends power save poll frames or wake-up frames at scheduled intervals, creating a rhythmic pattern that balances energy conservation with data transmission efficiency.
3Reliability
If the AP transmits wake-up frames to all STAs, then communication reliability is improved, but network overhead increases
Solution Approach 1:
The patent applies local quality by making wake-up frame transmission targeted rather than universal. Instead of sending wake-up frames to all STAs indiscriminately, the AP selectively transmits wake-up frames only to specific STAs that have indicated they are in power save mode and have buffered data, reducing network overhead while maintaining communication reliability for relevant devices.
Solution Approach 2:
The patent segments the network management by dividing STAs into different power mode groups (active mode and power save mode). The AP applies different management strategies to each segment, using conventional communication for active STAs and specialized power save mechanisms (power save poll frames, wake-up frames) for sleeping STAs, thereby reducing overall network overhead while ensuring reliable communication with each segment.
Data Source
AI summary
This document discloses a method and an apparatus for transmitting a paging frame and wakeup frame. The An AP comprises a transceiver receiving a paging frame from an STA; and a processor generating a wakeup frame for informing of existence of buffered data to be transmitted to the STA in response to the paging frame, where the paging frame includes a PLCP (Physical Layer Convergence Protocol) header and the PCLP header includes a waiting time field indicating a waiting time during which an STA is operated in the active mode to receive the wakeup frame; and the wakeup frame includes a PLCP header and the PLCP header includes a wakeup indication indicating the wakeup frame and a wakeup STA identification having information specifying the STA. Therefore, an STA can reduce power consumption wasted in the active mode.