To calculate the Network Mean Opinion Score (MOS) in OMNeT++ has needs to evaluate the perceived quality of a network service like voice or video transmission. The MOS is a particular parameter that rates the quality of the service on a scale usually from 1 (poor) to 5 (excellent). In simulation aspects like OMNeT++, MOS can be calculated based on objective network parameters like packet loss, latency, and jitter, which relate with user experience. The below is the brief structure to execute the MOS in OMNeT++:
Steps to Calculate MOS in OMNeT++
A simplified method can includes the following formula:
MOS=1+4×(R−0)Rmax−0MOS = 1 + \frac{4 \times (R – 0)}{R_{\text{max}} – 0}MOS=1+Rmax−04×(R−0)
Where:
The quality rating RRR can be estimated as:
R=R0−Iloss−Idelay−IjitterR = R_0 – I_{loss} – I_{delay} – I_{jitter}R=R0−Iloss−Idelay−Ijitter
double packetLossPercentage; // Calculated during the simulation
double latency; // Calculated during the simulation
double jitter; // Calculated during the simulation
double R0 = 94.2; // Base quality rating
double Iloss, Idelay, Ijitter, R, MOS;
// Calculate impairment due to packet loss
Iloss = 20 * log10(1 + 10 * packetLossPercentage);
// Calculate impairment due to delay
Idelay = 0.024 * latency;
if (latency > 177.3) {
Idelay += 0.11 * (latency – 177.3);
}
// Optionally calculate impairment due to jitter separately
Ijitter = 0.01 * jitter; // Example factor
// Calculate the quality rating
R = R0 – Iloss – Idelay – Ijitter;
// Calculate MOS
MOS = 1 + 4 * (R – 0) / (100 – 0);
EV << “Mean Opinion Score (MOS): ” << MOS << endl;
Example Application
In a VoIP scenario, we can use the MOS to measure how several network configurations like different routing protocols, traffic loads can affect the user experience. By running multiple simulations with varying conditions we need to determine which configurations offer the preeminent user experience.
In this module, we had successfully calculate and implement the mean option score in the network using OMNeT++ and also we plan to elaborate on the Network Mean Opinion Score procedure in other simulation scenarios.
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