Sensor Node Connection Cycle Adaptation for Wireless Power and Latency

Solution Overview

Problem

Existing wireless communication systems face challenges in reducing the power consumption of slave devices while minimizing long reconnection times.

Innovation Solution

The proposed wireless communication system employs an aggregate node and multiple sensor nodes, where the sensor nodes adjust their connection request transmission cycles based on whether the disconnection is intentional or unintentional, using different coefficients to manage power consumption and reconnection time.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If the slave device transmits connection requests at a short cycle to reduce reconnection time, then the reconnection time is reduced, but the power consumption increases

Engineering Contradiction:

Improvereconnection timeVSAvoidpower consumption of slave device

Core Design Contradiction:

Loss of timeVSUse of energy by moving object

Solution Approach 1:

The slave device dynamically adjusts the connection request transmission cycle based on the disconnection state. When an unintentional disconnection is detected, the device switches to a short transmission cycle to enable rapid reconnection. When the disconnection is intentional, the device uses a long transmission cycle to minimize power consumption. This dynamic adaptation resolves the contradiction by making the transmission cycle flexible rather than fixed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes the parameter of connection request transmission cycle based on the detected disconnection state. By detecting whether the disconnection is intentional or unintentional, the system modifies the transmission cycle parameter accordingly - using a first cycle (short) for unintentional disconnections and a second cycle (long) for intentional disconnections. This parameter change allows the system to optimize between reconnection speed and power consumption.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the slave device transmits connection requests frequently to ensure quick reconnection, then the reconnection reliability is improved, but the power consumption and communication load increase

Engineering Contradiction:

Improvereconnection reliabilityVSAvoidpower consumption of slave device

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The slave device dynamically adjusts the connection request transmission cycle based on the disconnection state. When an unintentional disconnection is detected, the device switches to a short transmission cycle to enable rapid reconnection. When the disconnection is intentional, the device uses a long transmission cycle to minimize power consumption. This dynamic adaptation resolves the contradiction by making the transmission cycle flexible rather than fixed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The slave device detects the disconnection state (intentional or unintentional) and uses this feedback information to adjust the connection request transmission cycle. The detection mechanism provides feedback about the nature of the disconnection, allowing the device to make informed decisions about transmission frequency. This feedback loop ensures high reconnection reliability when needed while avoiding unnecessary transmissions that would waste power.

Inventive Principle:

Principle #23Feedback

3Use of energy by moving object

If the slave device uses a long connection request transmission cycle to reduce power consumption, then the power consumption is reduced, but the reconnection time increases

Engineering Contradiction:

Improvepower consumption of slave deviceVSAvoidreconnection time

Core Design Contradiction:

Use of energy by moving objectVSLoss of time

Solution Approach 1:

The slave device dynamically adjusts the connection request transmission cycle based on the disconnection state. When an unintentional disconnection is detected, the device switches to a short transmission cycle to enable rapid reconnection. When the disconnection is intentional, the device uses a long transmission cycle to minimize power consumption. This dynamic adaptation resolves the contradiction by making the transmission cycle flexible rather than fixed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes the parameter of connection request transmission cycle based on the detected disconnection state. By detecting whether the disconnection is intentional or unintentional, the system modifies the transmission cycle parameter accordingly - using a first cycle (short) for unintentional disconnections and a second cycle (long) for intentional disconnections. This parameter change allows the system to optimize between reconnection speed and power consumption.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12219621B2Wireless communication system

Publication Date: 2025.02.04 DENSO CORP

AI summary

A wireless communication system includes an aggregate node and sensor nodes wirelessly communicable with the aggregate node. The sensor nodes each transmit data to the aggregate node in a respective scheduled data transmission cycle whenever in a connected state which enables wireless communication therewith. The sensor nodes each cyclically transmits a connection request for wireless communication to the aggregate node whenever in a disconnected state. Then, the sensor nodes each set a request transmission cycle for transmission of the connection request. As to the request transmission cycle, in a situation of being put in a disconnected state unintentionally, the sensor nodes each shorten the request transmission cycle relative to a cycle used in a situation of being intentionally put in a disconnected state.