How to Begin Implement Network Achievable Sum Rate in NS3

To begin implementing and analyzing the Network Achievable Sum Rate in NS3, we follow these structured steps. The achievable sum rate is the overall data rate, which could be supported by entire dynamic connections within network in provided conditions with channel quality, interference, and resource allocation.

Steps to Begin Implement Network Achievable Sum Rate in NS3

1. Understand Achievable Sum Rate

The achievable sum rate is determined as:

Rsum=∑i=1NRiR_{\text{sum}} = \sum_{i=1}^N R_iRsum​=i=1∑N​Ri​

where RiR_iRi​ is the rate of the iii-th link, which is computed by:

• Modulation and coding scheme.
• Channel bandwidth.
• Signal-to-Interference-plus-Noise Ratio (SINR).

For only one link, RiR_iRi​ is computed as:

Ri=B⋅log⁡2(1+SINRi)R_i = B \cdot \log_2(1 + \text{SINR}_i)Ri​=B⋅log2​(1+SINRi​)

where:

• BBB: Channel bandwidth within Hz.
• SINRi\text{SINR}_iSINRi​: SINR for the iii-th link.

2. Set Up Your Environment

Make sure that we have installed ns3 properly. We can utilize suitable components like Wi-Fi, LTE, or 5G according to the needs of network.

3. Create the Network Topology

Example: Wireless Network Topology

NodeContainer nodes;

nodes.Create(3); // Create a base station and two user equipment (UE)

MobilityHelper mobility;

mobility.SetPositionAllocator(“ns3::GridPositionAllocator”,

“MinX”, DoubleValue(0.0),

“MinY”, DoubleValue(0.0),

“DeltaX”, DoubleValue(50.0),

“DeltaY”, DoubleValue(50.0),

“GridWidth”, UintegerValue(2),

“LayoutType”, StringValue(“RowFirst”));

mobility.SetMobilityModel(“ns3::ConstantPositionMobilityModel”);

mobility.Install(nodes);

YansWifiChannelHelper channel = YansWifiChannelHelper::Default();

YansWifiPhyHelper phy = YansWifiPhyHelper::Default();

phy.SetChannel(channel.Create());

WifiHelper wifi;

wifi.SetStandard(WIFI_PHY_STANDARD_80211n);

WifiMacHelper mac;

mac.SetType(“ns3::AdhocWifiMac”);

NetDeviceContainer devices = wifi.Install(phy, mac, nodes);

4. Set Up the Internet Stack

We should install the Internet stack for IP-based interaction:

InternetStackHelper stack;

stack.Install(nodes);

Ipv4AddressHelper address;

address.SetBase(“10.1.1.0”, “255.255.255.0”);

Ipv4InterfaceContainer interfaces = address.Assign(devices);

5. Generate Traffic

For generating traffic and replicating the network load we need to install applications.

Example: UDP Traffic

UdpEchoServerHelper echoServer(9);

ApplicationContainer serverApps = echoServer.Install(nodes.Get(0)); // Base station

serverApps.Start(Seconds(1.0));

serverApps.Stop(Seconds(10.0));

UdpEchoClientHelper echoClient(interfaces.GetAddress(0), 9);

echoClient.SetAttribute(“MaxPackets”, UintegerValue(100));

echoClient.SetAttribute(“Interval”, TimeValue(Seconds(0.01))); // 10ms interval

echoClient.SetAttribute(“PacketSize”, UintegerValue(1024)); // 1KB packets

ApplicationContainer clientApps = echoClient.Install(nodes.Get(1)); // UE 1

clientApps.Add(echoClient.Install(nodes.Get(2))); // UE 2

clientApps.Start(Seconds(2.0));

clientApps.Stop(Seconds(10.0));

6. Measure SINR

In the network, we can assess SINR for every single link.

Using Channel Conditions

Determine SINR with the support of ns3’s PHY and channel models:

Ptr<WifiPhy> phy = DynamicCast<WifiNetDevice>(devices.Get(1))->GetPhy();

phy->TraceConnectWithoutContext(“Snr”, MakeCallback([](double snr) {

double sinr = std::pow(10, snr / 10); // Convert SNR from dB to linear

std::cout << “SINR: ” << sinr << std::endl;

}));

7. Calculate Achievable Sum Rate

Compute Individual Rates

For every single dynamic link, we can determine individual rates:

double bandwidth = 20e6; // 20 MHz channel bandwidth

double sinr = …;       // SINR from channel model

double rate = bandwidth * std::log2(1 + sinr);

std::cout << “Rate: ” << rate / 1e6 << ” Mbps” << std::endl;

Sum Up Rates

Combine the rates for every active links:

double sumRate = 0.0;

for (auto& link : activeLinks) {

sumRate += link.rate;

}

std::cout << “Achievable Sum Rate: ” << sumRate / 1e6 << ” Mbps” << std::endl;

8. Enable Tracing

Packet-Level Tracing

Record all packets for in-depth analysis:

AsciiTraceHelper ascii;

phy.EnableAsciiAll(ascii.CreateFileStream(“sum_rate_analysis.tr”));

PCAP Tracing

Make PCAP tracing files for packet-level inspection:

phy.EnablePcapAll(“sum_rate_analysis”);

9. Visualize Results

• Apply MATLAB or Excel tools to transfer SINR, individual rates, and the sum rate for graphing to a file.
• Envision the network using NetAnim:

AnimationInterface anim(“sum_rate_analysis.xml”);

10. Experiment with Parameters

• Experiment diverse bandwidths like10 MHz, 20 MHz.
• Replicate the mobility for monitoring their influence over SINR and rates.
• Fine-tune traffic models such as packet size, interval, making diverse network loads.

11. Run the Simulation

Finally, we can execute the simulation and then examine:

Simulator::Run();

Simulator::Destroy();

We have presented the Network Achievable Sum Rate implementation in a clear and step-by-step manner with sample coding in NS3. More advanced explanation can be added on request.