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How to Calculate Network Transmission Quality in omnet++

To calculate the network transmission quality in OMNeT++ encompasses evaluating several metrics that reflect the effectiveness and reliability of data transmission through the network. Transmission quality can be estimate using a grouping of metrics like Packet Delivery Ratio (PDR), latency, jitter, throughput, and error rates. Based on the particular focus of the study, we may select to join these metrics into a unique quality score or assess them separately.

Common Metrics for Network Transmission Quality

  1. Packet Delivery Ratio (PDR):
    • Definition: The ratio of the number of packets effectively received by the end to the number of packets sent by the source.
    • Calculation: PDR=Number of Packets ReceivedNumber of Packets Sent×100\text{PDR} = \frac{\text{Number of Packets Received}}{\text{Number of Packets Sent}} \times 100PDR=Number of Packets SentNumber of Packets Received​×100
  2. Latency (Delay):
    • Definition: The time taken for a packet from the source to the destination to travel.
    • Calculation: Note that the time when a packet is sent and the time when it is received. The latency is the variance among these two times.
  3. Jitter:
    • Definition: The difference in packet arrival times. High jitter can manage to poor transmission quality, particularly in real-time applications like VoIP.
    • Calculation: Assess the variance in latency among successive packets.
  4. Throughput:
    • Definition: The rate at which data is effectively transferred through the network.
    • Calculation: Throughput=Total Data Received (in bits)Total Time (in seconds)\text{Throughput} = \frac{\text{Total Data Received (in bits)}}{\text{Total Time (in seconds)}}Throughput=Total Time (in seconds)Total Data Received (in bits)​
  5. Bit Error Rate (BER):
    • Definition: The rate at which errors happen in the transferred data.
    • Calculation: BER=Number of Bit ErrorsTotal Number of Bits Transmitted\text{BER} = \frac{\text{Number of Bit Errors}}{\text{Total Number of Bits Transmitted}}BER=Total Number of Bits TransmittedNumber of Bit Errors​

Implementing in OMNeT++

Given below details is to calculate these metrics in an OMNeT++ simulation:

  1. Packet Delivery Ratio (PDR) Calculation:

int packetsSent = 0;

int packetsReceived = 0;

// When a packet is sent

packetsSent++;

// When a packet is received

packetsReceived++;

// Calculate PDR at the end of the simulation

double pdr = (double)packetsReceived / packetsSent * 100;

recordScalar(“Packet Delivery Ratio (%)”, pdr);

EV << “Packet Delivery Ratio: ” << pdr << ” %” << endl;

  1. Latency Calculation:

simtime_t sendTime; // Record the time when a packet is sent

// When a packet is sent

sendTime = simTime();

// When a packet is received

simtime_t receiveTime = simTime();

simtime_t latency = receiveTime – sendTime;

recordScalar(“Packet Latency (s)”, latency.dbl());

EV << “Packet Latency: ” << latency << ” s” << endl;

  1. Jitter Calculation:

simtime_t previousLatency = 0;

simtime_t currentLatency;

simtime_t jitter = 0;

// When a packet is received

currentLatency = simTime() – sendTime;

if (previousLatency != 0) {

jitter = fabs(currentLatency – previousLatency);

recordScalar(“Packet Jitter (s)”, jitter.dbl());

EV << “Packet Jitter: ” << jitter << ” s” << endl;

}

previousLatency = currentLatency;

  1. Throughput Calculation:

long totalBytesReceived = 0;

simtime_t startTime = simTime();

// When a packet is received

totalBytesReceived += packet->getByteLength();  // or getBitLength() for bits

// At the end of the simulation

simtime_t endTime = simTime();

simtime_t totalTime = endTime – startTime;

double throughput = (totalBytesReceived * 8) / totalTime.dbl();  // in bps

recordScalar(“Throughput (bps)”, throughput);

EV << “Throughput: ” << throughput << ” bps” << endl;

  1. Bit Error Rate (BER) Calculation:

int totalBitsTransmitted = 0;

int bitErrors = 0;

// When a packet is received

// Assume we have a function to calculate the number of bit errors in the packet

bitErrors += calculateBitErrors(receivedPacket);

totalBitsTransmitted += receivedPacket->getBitLength();

// At the end of the simulation

double ber = (double)bitErrors / totalBitsTransmitted;

recordScalar(“Bit Error Rate (BER)”, ber);

EV << “Bit Error Rate: ” << ber << endl;

Combining Metrics for a Transmission Quality Score

If we need to combine these metrics into an only one quality score, we can regularise each metric and then calculate a weighted sum. For example:

double qualityScore = w1 * pdr + w2 * (1 / latency.dbl()) + w3 * (1 / jitter.dbl()) + w4 * throughput – w5 * ber;

// Normalize each metric to a common scale, typically between 0 and 1

// Adjust the weights (w1, w2, w3, w4, w5) according to the importance of each metric

recordScalar(“Network Transmission Quality Score”, qualityScore);

EV << “Network Transmission Quality Score: ” << qualityScore << endl;

Here, we had provided much more details and methods is helps to compute the Network Transmission Quality using in OMNeT++. We will offer further informations according to your requests.

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