Asynchronous Repeater Wakeup Protocol for Wireless Networks

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Solution Overview

Problem

The existing frequency hopping communication protocols in wireless communications systems experience significant delays due to the need for repeater request and acknowledgement sequences, which increase the time required to establish communication between an originating device and a target device, especially when using multiple repeaters.

Innovation Solution

The method involves transmitting a communication from an originating device to a target device through a repeating device before receiving a repeater request or acknowledgement sequence, allowing immediate retransmission upon receipt of the communication, thereby reducing the overall delay in the communication setup process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If repeater request and acknowledgement sequences are used to establish communication through a repeater, then communication reliability is improved, but communication establishment time increases significantly

Engineering Contradiction:

Improvecommunication establishment reliabilityVSAvoidcommunication establishment time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system performs preliminary actions by having the repeater continuously monitor for communications and pre-establish readiness to repeat. When a communication is detected, the repeater immediately begins repeating it without waiting for request/acknowledgement sequences, thereby eliminating the time delay while maintaining reliable communication establishment.

Inventive Principle:

Principle #10Preliminary action

2Stability of the object's composition

If traditional frequency hopping protocol with repeater sequences is used, then protocol robustness is improved, but communication speed deteriorates

Engineering Contradiction:

Improveprotocol robustnessVSAvoidcommunication speed

Core Design Contradiction:

Stability of the object's compositionVSSpeed

Solution Approach 1:

The invention extracts and removes the time-consuming repeater request and acknowledgement sequences from the frequency hopping protocol while retaining the essential frequency hopping robustness. This allows the system to maintain protocol stability through frequency hopping without the detrimental effect of extended establishment sequences, thereby improving communication speed.

Inventive Principle:

Principle #2Taking out (Extraction)

3Area of stationary object

If multiple repeaters are used to extend communication range, then coverage area is improved, but delay in communication establishment increases

Engineering Contradiction:

Improvecommunication coverage areaVSAvoidcommunication establishment delay

Core Design Contradiction:

Area of stationary objectVSLoss of time

Solution Approach 1:

Each repeater in the network independently monitors for communications and automatically begins repeating detected signals without requiring request/acknowledgement coordination with other repeaters. This self-service approach allows multiple repeaters to operate autonomously, extending coverage area while eliminating the coordination delays that would otherwise occur in multi-repeater scenarios.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS8565145B2Fast access asynchronous repeater wakeup protocol

Publication Date: 2013.10.22 MOTOROLA SOLUTIONS INC

AI summary

A method for transmitting a communication generated by an originating device to a target device using a repeating device is provided. In the method the communication is transmitted from the originating device and received at the repeating device. A repeater request sequence is transmitted from the originating device and retransmitted from the first repeating device to the target device before the repeater request sequence is received at the first repeating device.