STA Power Save Mode via Cross-BSS Frame Detection
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Solution Overview
Problem
In wireless LANs, station (STA) devices face challenges in power save mode operations, particularly in determining when to transition between awake and doze states to manage power consumption effectively while handling pending frames across different basic service sets (BSS), leading to inefficiencies in power management and extended battery life.
Innovation Solution
A method and apparatus for power save mode operation in wireless LANs that involves receiving a beacon frame with a traffic indication map, transmitting a power saving poll frame, and determining the TXOP power save mode operation based on acknowledgement frames, allowing STA to transition between states based on frame transmission from another BSS, thereby optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the STA operates in the doze state for power saving, then power consumption is reduced and battery life is extended, but the STA cannot receive or transmit frames and cannot detect pending frames from the AP
Solution Approach 1:
The patent introduces another BSS frame transmission as an intermediary signal that allows the STA in doze state to indirectly detect channel activity and infer the presence of pending frames without actively monitoring its own BSS, thus resolving the contradiction between power saving and frame detection
Solution Approach 2:
The STA performs preliminary transition to awake state based on detection of another BSS frame transmission before actually needing to communicate, allowing it to proactively check for pending frames from its associated AP before the doze state would prevent detection
2Reliability
If the STA periodically transitions to awake state to check for pending frames, then the STA can receive information about downlink data, but power consumption increases and battery life is reduced
Solution Approach 1:
The patent modifies the periodic awake state transitions by triggering them based on external events (detection of another BSS frames) rather than fixed intervals, allowing the STA to maintain reliability while reducing unnecessary periodic wake-ups that consume power
Solution Approach 2:
The STA uses the naturally occurring transmissions from another BSS as free signals to trigger its own awake state transitions, effectively using environmental events to service its frame detection needs without requiring dedicated polling or fixed scheduling
3Productivity
If the STA monitors another BSS frame transmission to determine TXOP power save mode operation, then the STA can optimize power management, but the device complexity increases due to additional frame processing requirements
Solution Approach 1:
The patent extracts only the essential information from another BSS frames (presence/absence detection, basic frame type identification) needed to trigger power save mode decisions, discarding the rest of the frame processing complexity while maintaining power management efficiency
Data Source
AI summary
Disclosed are a method and an apparatus for power save mode operation on the basis of a frame transmitted from another BSS in a wireless LAN. A method for operating an STA in a wireless LAN in a power save mode comprises: a step in which the STA receives a beacon frame from an AP, the beacon frame comprising a TIM element indicating downlink data pending in the STA; a step in which the STA transmits a PS-poll frame to the AP in response to the beacon frame; a step in which the STA receives, from the AP, an ACK frame transmitted by the AP in response to the PS-poll frame; and a step in which the STA determines the operation of the another BSS in a TXOP power save mode on the basis of the ACK frame.