Access Control Signal Rate Adjustment for Energy Reduction

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Solution Overview

Problem

Existing access control systems face challenges in determining when a mobile device is proximate to a room, leading to continuous energy consumption in projecting wireless signals for detection.

Innovation Solution

The method involves projecting a first wireless signal at a specific rate to detect the mobile device's proximity, obtaining credentials, and adjusting the signal rate for a selected time period, with authorized access controls increasing their signal rate and unauthorized ones reducing it to conserve energy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the access control continuously projects a wireless signal for detection, then the mobile device can be reliably detected when proximate to the room, but energy consumption increases

Engineering Contradiction:

Improvedetection reliabilityVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The access control device projects wireless signals at different rates based on detected proximity. When a mobile device is detected at a first distance, the system transitions from a first signal rate to a second signal rate for a selected time period, creating periodic variations in signal projection that reduce average energy consumption while maintaining detection reliability

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The wireless signal projection rate is dynamically adjusted based on the detected location of the mobile device. The system changes the signal rate from a first rate to a second rate when proximity is detected, and further adjusts to a third rate based on authorization status, making the energy consumption adaptive to actual operational needs

Inventive Principle:

Principle #15Dynamics

2Measurement precision

If the access control increases the signal rate to track mobile device location and movement, then location tracking precision improves, but energy consumption increases

Engineering Contradiction:

Improvelocation tracking precisionVSAvoidenergy consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The system implements periodic signal rate adjustments rather than continuous high-rate projection. By projecting at a second rate for a selected time period after detection, then potentially reducing to a third rate, the system achieves location tracking precision only when necessary, reducing overall energy consumption while maintaining measurement precision during active tracking phases

Inventive Principle:

Principle #19Periodic action

3Speed

If all access controls in the group project wireless signals at a high rate, then credential propagation speed increases, but overall system energy consumption increases

Engineering Contradiction:

Improvecredential propagation speedVSAvoidsystem energy consumption

Core Design Contradiction:

SpeedVSLoss of energy

Solution Approach 1:

Different access controls in the group project wireless signals at different rates based on their authorization status. Authorized access controls project at a second rate while unauthorized ones project at a third rate (lower than or equal to the first rate), creating local differentiation in signal projection intensity that reduces overall system energy consumption while maintaining fast credential propagation where needed

Inventive Principle:

Principle #3Local quality

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach effectively tracks the mobile device's location and movement, optimizing energy consumption by adjusting signal rates based on proximity and authorization, thereby enhancing access control efficiency.

Implementation Method 1

projecting a first wireless signal at a first rate; detecting the first wireless signal indicating that a mobile device is located at a first distance away from a first access control

Methodology Applied

Scientific EffectWireless signal propagation: Electromagnetic Induction

Implementation Method 2

projecting a second wireless signal at a second rate for a selected time period... the second rate is greater than the first rate... projecting a third wireless signal at a third rate less than the second rate

Methodology Applied

Scientific EffectEnergy optimization through variable rate signaling:

Data Source

PatentUS11470445B2Methods for access latency reduction through phone pre-connection based on user location

Publication Date: 2022.10.11 HONEYWELL INTERNATIONAL INC

AI summary

A method including: projecting a first wireless signal at a first rate; detecting the first wireless signal indicating that a mobile device is located at a first distance away from a first access control; obtaining a credential from the mobile device; transmitting the credential to a group of access controls; and projecting a second wireless signal at a second rate for a selected time period.