Wireless Transmitter Hidden Channel Collision Prevention

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Solution Overview

Problem

In wireless network environments, data collisions occur when two wireless senders with different communication ranges simultaneously transmit data to a receiver, leading to inefficient resource consumption and communication quality deterioration, as one sender cannot detect the transmission state of the other.

Innovation Solution

A data collision prevention method where one wireless sender detects the transmission state of another nearby sender and checks the channel idle state before transmitting, using Pre-CCA and Post-CCA checks, and adjusts transmission channels if a hidden channel problem is detected to prevent collisions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If wireless senders transmit data simultaneously without detection, then communication speed increases, but data collision occurs and communication quality deteriorates

Engineering Contradiction:

Improvecommunication speedVSAvoidcommunication quality

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent implements preliminary channel detection actions (CCA checks) before data transmission. The first wireless sender performs Pre-CCA before transmitting and Post-CCA after transmitting to detect channel occupancy. This preliminary detection mechanism prevents simultaneous transmission by identifying hidden channel problems before they cause data collisions, thereby maintaining both high communication speed and reliable quality.

Inventive Principle:

Principle #10Preliminary action

2Area of stationary object

If wireless senders increase transmission power to extend range, then coverage area increases, but hidden channel problem worsens as senders cannot detect each other

Engineering Contradiction:

Improvecoverage areaVSAvoidtransmission state detection

Core Design Contradiction:

Area of stationary objectVSDifficulty of detecting and measuring

Solution Approach 1:

The patent implements a feedback mechanism where the first wireless sender transmits data and receives feedback about channel occupancy status through Pre-CCA and Post-CCA detection. The system continuously monitors whether the channel is occupied by other senders and adjusts transmission accordingly. This feedback loop enables reliable detection of hidden channel problems even when coverage areas are extended, preventing data collisions while maintaining broad coverage.

Inventive Principle:

Principle #23Feedback

3Reliability

If wireless senders perform continuous channel detection, then data collision prevention improves, but communication resource consumption increases

Engineering Contradiction:

Improvecollision preventionVSAvoidcommunication resource consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic channel detection rather than continuous detection. The first wireless sender performs CCA checks at specific intervals: Pre-CCA before transmission and Post-CCA after transmission. This periodic action pattern maintains effective collision prevention by detecting channel occupancy at critical moments while minimizing unnecessary detection operations, thereby balancing reliability with reduced communication resource consumption.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS11019661B2Method and wireless transmitter for preventing data collision involving hidden channel problem

Publication Date: 2021.05.25 SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION

AI summary

The present invention relates to a data collision prevention method that is capable of solving a so-called hidden channel problem that may arise when there are two wireless senders with different communication ranges. More particularly, the present invention relates to a data collision prevention method and a wireless sender enabling such prevention, wherein a data collision may occur when two wireless senders simultaneously transmit data to a receiver in a situation where only one wireless sender can detect a data transmission state of the other wireless sender.