Frequency Hopping Data Transmission for Wireless Sensor Networks

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Solution Overview

Problem

Wireless sensor networks face challenges in ensuring reliable data transmission due to interference and energy consumption, particularly in environments requiring high reliability and low delay, where existing methods like retransmission and increased signal power are inadequate.

Innovation Solution

Implementing a frequency hopping data transmission method, where a frequency hopping time period and frequency hopping information are acquired and used for transmitting important data, reducing system overhead and interference while maintaining reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If retransmission is used to improve reliability, then reliability is improved, but transmission delay increases and energy consumption increases

Engineering Contradiction:

Improvedata transmission reliabilityVSAvoidtransmission delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by performing frequency hopping in advance before data transmission. The transmitting device and receiving device pre-synchronize the frequency hopping sequence, so when data transmission occurs, they are already operating on the same frequency channel. This eliminates the need for retransmission due to frequency conflicts, thereby improving reliability without increasing delay.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If signal transmission power is increased to improve reliability, then reliability is improved, but energy consumption increases

Engineering Contradiction:

Improvedata transmission reliabilityVSAvoidtransmission energy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies parameter changes by dynamically switching the frequency channel parameter during transmission. Instead of increasing power, the system changes the frequency parameter to avoid interference. The transmitting device monitors channel quality and switches to alternative frequencies when interference is detected, maintaining reliability through parameter variation rather than power increase.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If signal transmission power is increased to improve reliability, then reliability is improved, but interference to other devices increases

Engineering Contradiction:

Improvedata transmission reliabilityVSAvoidinterference to other devices

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent applies segmentation by dividing the frequency spectrum into multiple channels and time slots. Instead of using high power on a single channel, the system segments transmission across multiple frequency channels and time periods. This frequency-time segmentation reduces the power density on any single channel, thereby reducing interference to other devices while maintaining overall transmission reliability through diversity.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS8335244B2Data transmission method, network device, and communication system

Publication Date: 2012.12.18 HUAWEI TECH CO LTD

AI summary

A data transmission method, a network device, and a communication system are provided. The method includes: acquiring a frequency hopping time period and frequency hopping information when reliable transmission is required; transmitting data according to the frequency hopping information in the frequency hopping time period. Thus, the reliability of data transmission is ensured, the original network is not changed significantly, and the system overhead and resources are saved.