Simulate an 802.11ax Network with Full MAC and Abstracted PHY
This example shows how to create, configure, and simulate an IEEE® 802.11ax™ network with a full or abstracted model of medium access control (MAC) and the physical layer (PHY). At the transmitter and receiver, modeling full MAC processing involves complete MAC frame generation at the MAC layer. Similarly, modeling full PHY processing involves complete operations related to waveform transmission and reception through a fading channel. When you simulate large networks, full MAC and PHY processing is computationally expensive. In an abstracted MAC, the node does not generate or decode any frames at the MAC layer. Similarly, in an abstracted PHY, the node does not generate or decode any waveforms at the PHY. MAC and PHY abstraction enables you to minimize the complexity and duration of the system-level simulations.
Using this example, you can:
Create and configure a two-node 802.11ax network consisting of one access point (AP) and one station (STA).
Associate the STA with the AP and add full buffer uplink (UL) application traffic.
Configure the AP and STA to implement full MAC and an abstracted PHY.
Simulate the 802.11ax network and visualize the statistics.
Check if the Communications Toolbox™ Wireless Network Simulation Library support package is installed. If the support package is not installed, MATLAB® returns an error with a link to download and install the support package.
Set the seed for the random number generator to
1. The seed value controls the pattern of random number generation. The random number generated by the seed value impacts several processes within the simulation including backoff counter selection at the MAC layer and predicting packet reception success at the PHY. To improve the accuracy of your simulation results, after running the simulation, you can change the seed value, run the simulation again, and average the results over multiple simulations.
Specify the simulation time in seconds.
simulationTime = 0.3;
Initialize the wireless network simulator.
networkSimulator = wirelessNetworkSimulator.init;
Specify the number of nodes in the network. Set the positions of the nodes as a vector. Units are in meters. Each row of the vector specifies the x-, y-, and z- Cartesian coordinates of a node, starting from the first node.
numNodes = 2; nodePositions = [0 0 0;20 20 20];
PHYAbstractionMethod properties of the
wlanNode object enable you to configure MAC and PHY layer abstraction. The valid values for these properties are:
true. To use the full MAC, set this property to
"none". To use the abstracted PHY, set this property to
"tgax-mac-calibration". If you set this property to
"tgax-evaluation-methodology", the PHY estimates the performance of a link with the TGax channel model by using an effective signal-to-interference-plus-noise-ratio (SINR) mapping. If you set this property to
"tgax-mac-calibration", the PHY assumes a packet failure due to interference without actually calculating the link performance. To use the full PHY, set this property to
MACFrameAbstraction = true; PHYAbstractionMethod = "tgax-mac-calibration";
Set the configuration parameters of the AP and the STA by using the
accessPointCfg = wlanDeviceConfig(Mode="AP",MCS=2,TransmitPower=15); % AP device configuration stationCfg = wlanDeviceConfig(Mode="STA",MCS=2,TransmitPower=15); % STA device configuration
Create an AP and a STA from the specified configuration by using the
accessPoint = wlanNode(Name="AP", ... Position=nodePositions(1,:), ... DeviceConfig=accessPointCfg, ... PHYAbstractionMethod=PHYAbstractionMethod, ... MACFrameAbstraction=MACFrameAbstraction); station = wlanNode(Name=["STA"], ... Position=nodePositions(2,:), ... DeviceConfig=stationCfg, ... PHYAbstractionMethod=PHYAbstractionMethod, ... MACFrameAbstraction=MACFrameAbstraction);
Create an 802.11ax network consisting of an AP and a STA.
nodes = [accessPoint station];
Associate the STA with the AP and add full buffer UL application traffic.
Add nodes to the wireless network simulator.
Run the network simulation for the specified simulation time.
Custom channel model is not added. Using free space path loss (fspl) model as the default channel model.
At each node, the simulation captures the statistics by using the
statistics object function. The
stats variable captures the application statistics, MAC layer statistics, physical layer statistics, and mesh forwarding statistics for each node. For more information about these statistics, see the WLAN System-Level Simulation Statistics topic.
stats = statistics(nodes)
stats=1×2 struct array with fields: Name ID App MAC PHY Mesh