Implicit WLAN Power Management Mode Transitions
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Solution Overview
Problem
Existing wireless communication technologies require explicit frame exchanges for power management mode and state transitions in WLAN stations, leading to increased power consumption and network congestion due to the need for signaling messages and delayed entry into more power-efficient states.
Innovation Solution
Implementing implicit power management mode and state transitions, where stations transition without explicit indication to the access point based on agreed mechanisms, using traffic indication maps, beacon signals, and pre-negotiated times to manage power states efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If explicit frame exchanges are used for power management mode and state transitions, then the access point can accurately track station status, but power consumption increases and network congestion worsens
Solution Approach 1:
The station autonomously manages its own power state transitions without requiring explicit signaling to the access point. The station independently transitions between active and power save modes based on local conditions, eliminating the need for bidirectional frame exchanges and reducing overall power consumption while maintaining reliable tracking through implicit state changes.
2Reliability
If explicit frame exchanges are used for power management mode and state transitions, then the access point can accurately track station status, but network congestion increases
Solution Approach 1:
The station autonomously manages its own power state transitions without requiring explicit signaling to the access point. The station independently transitions between active and power save modes based on local conditions, eliminating the need for bidirectional frame exchanges and reducing overall power consumption while maintaining reliable tracking through implicit state changes.
3Reliability
If explicit signaling is used for power management transitions, then the access point is informed of state changes, but the station must delay entering power-efficient states
Solution Approach 1:
Instead of the station signaling the access point about its power state changes, the access point infers the station's state by observing the absence of signaling frames. This inversion of the communication paradigm allows the station to transition immediately to power-efficient states without waiting for explicit acknowledgment, while the access point maintains awareness through implicit observation of frame patterns.
4Reliability
If explicit frame exchanges are used for power management transitions, then state changes are communicated, but additional signaling messages increase traffic loading
Solution Approach 1:
The patent extracts and eliminates the unnecessary explicit signaling frames from the power management transition process. By removing the bidirectional frame exchanges that were previously required for state change communication, the system reduces network traffic loading while maintaining reliable state change communication through the implicit mechanism of frame presence and absence.
Data Source
AI summary
A station (STA) of a wireless local area network (WLAN) transitions implicitly between power management (PM) modes or PM states, without providing an explicit indication of the PM mode/state change to an access point (AP) of the WLAN. Transitions include changes between an active mode and a power save (PS) mode, or between an awake state and a doze state of the PS mode. Transitions occur immediately after receipt of a beacon indicating pending data for the STA, after an offset time indicated in the beacon, or at a specific wake time negotiated with the AP. After data reception is complete, the STA transitions implicitly to the PS mode or a doze state of the PS mode, after a power save inactivity timeout period or after receiving an indication that data transmission is complete.