Access Point Power Save Handover for Continuous Connectivity

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Solution Overview

Problem

AP power save operations in wireless communication networks can negatively impact communication performance by causing lower throughput, dropped packets, increased latency, and reduced transmission range due to sparse client connectivity and unplanned power downs.

Innovation Solution

Implement techniques for seamless transition of communications by notifying clients of upcoming AP power save operations and coordinating link transfers to neighboring APs, ensuring continuous connectivity and improved performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If AP performs power save operations to reduce energy consumption, then energy efficiency is improved, but communication reliability deteriorates due to dropped packets and disconnected clients

Engineering Contradiction:

Improveenergy consumptionVSAvoidcommunication reliability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The system performs preliminary actions by notifying clients of upcoming power save operations in advance and pre-establishing backup links on neighboring APs before the power save event occurs. This allows seamless transition without dropping packets or disconnecting clients, resolving the contradiction between energy saving and communication reliability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system introduces intermediary elements including notification messages that mediate between the AP's power save intent and client awareness, and backup link mechanisms that serve as intermediaries to maintain communication continuity. These intermediaries enable the AP to enter power save mode while preserving reliable communication through alternative paths.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Use of energy by moving object

If AP enters power save mode to conserve energy, then energy efficiency is improved, but transmission performance deteriorates due to lower throughput and increased latency

Engineering Contradiction:

Improveenergy efficiencyVSAvoidthroughput

Core Design Contradiction:

Use of energy by moving objectVSProductivity

Solution Approach 1:

The system establishes backup communication links on neighboring APs before the AP enters power save mode. This preliminary action ensures that throughput is maintained by redirecting traffic through pre-configured alternative paths, eliminating the trade-off between energy saving and productivity.

Inventive Principle:

Principle #10Preliminary action

3Use of energy by moving object

If AP performs unplanned power downs to save energy, then energy consumption is reduced, but communication stability deteriorates due to sparse client connectivity

Engineering Contradiction:

Improveenergy consumptionVSAvoidcommunication stability

Core Design Contradiction:

Use of energy by moving objectVSStability of the object's composition

Solution Approach 1:

Even for unplanned power downs, the system performs preliminary notifications to clients and pre-establishes backup links before the power save operation. This ensures stable client connectivity is maintained through alternative paths, resolving the contradiction between energy reduction and communication stability.

Inventive Principle:

Principle #10Preliminary action

4Use of energy by moving object

If AP reduces power to save energy, then energy efficiency is improved, but transmission range deteriorates due to reduced transmission range

Engineering Contradiction:

Improveenergy efficiencyVSAvoidtransmission range

Core Design Contradiction:

Use of energy by moving objectVSLength of moving object

Solution Approach 1:

The system uses neighboring APs as intermediary relay points to extend transmission range. When an AP reduces power, clients can communicate through backup links to neighboring APs, effectively maintaining the transmission range despite reduced power consumption at the original AP.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20250294450A1Seamless transition procedures for access point power save

Publication Date: 2025.09.18 CISCO TECHNOLOGY INC

AI summary

Techniques and apparatus for facilitating seamless transition of communications within a wireless network during access point (AP) power save operations are described. An example technique includes transmitting a power save schedule for the first AP MLD to a client MLD. The power save schedule indicates time period(s) during which the first AP MLD will perform an AP power save operation. An AP power save notification for the first AP MLD is transmitted to the client MLD and indicates an amount of time after which the first AP MLD will perform the AP power save operation. A determination is made that the client MLD is connected to the first AP MLD within a predetermined amount of time of the AP power save operation. In response to the determination, link(s) for the client MLD are set up on the second AP MLD prior to the AP power save operation.