Group Owner Power Management via Beacon Interval Adjustment
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Solution Overview
Problem
Scanning operations in wireless local area networks (WLANs) consume significant power, particularly for battery-powered devices, as they need to constantly search for nearby access points, leading to increased power consumption and reduced device discoverability.
Innovation Solution
A wireless device operates in a mode that switches between a low power mode and an active mode based on the association status of paired client devices, reducing power consumption when all devices are associated and increasing discoverability when not all are associated by adjusting beacon transmission intervals and transceiver activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If the group owner continuously transmits beacons and maintains active transceiver state, then device discoverability is improved, but power consumption increases
Solution Approach 1:
The group owner transmits beacons periodically at specific intervals rather than continuously, and transitions between active and low-power states in periodic cycles. This allows the device to be discoverable at regular intervals while consuming less power during intervals when beacon transmission is suspended and the transceiver enters low-power mode.
Solution Approach 2:
The system dynamically adjusts the transceiver operational state based on whether paired client devices are associated. When all paired devices are associated, the group owner enters low-power mode; when devices are unassociated, the group owner becomes active. This dynamic adaptation resolves the contradiction by matching power consumption levels to actual discoverability needs.
2Duration of action of moving object
If the group owner enters low power mode to reduce consumption, then battery life is extended, but device discoverability deteriorates
Solution Approach 1:
The group owner monitors the association status of paired client devices and uses this feedback to determine transceiver operational mode. When unassociated devices are detected, the system receives feedback that discoverability is needed, triggering a transition from low-power mode to active mode. This feedback mechanism ensures battery life is maximized without compromising discoverability when actually needed.
3Difficulty of detecting and measuring
If the transceiver is kept active to respond to scanning devices, then discoverability is maintained, but power consumption increases
Solution Approach 1:
Paired client devices perform scanning operations to locate the group owner, eliminating the need for the group owner to continuously broadcast beacons for their own discovery. The group owner can enter low-power mode while paired devices handle the scanning and discovery process, reducing the group owner's power consumption while maintaining discoverability through the clients' scanning activities.
Data Source
AI summary
A wireless device configured as a group owner determines whether all client devices paired with the group owner are currently associated with the group owner. If all paired client devices are currently associated with the group owner, the group owner enters a first mode in which the group owner is in an active mode (powered up to communicate) during a first portion of a beacon interval and is in a low power mode (in which no communication occurs) during a second portion of the beacon interval. If not all paired client devices are currently associated with the group owner, the group owner enters a second mode in which the group owner is in the active state during the first portion and at least part of the second portion of the beacon interval. The group owner and client devices are configured to operate as master and slave.