LTE MIMO

You simulate the example configuration for MIMO in an LTE network Energy model to understand the impact of SISO and MIMO Transmission modes on the throughput of the applications transferred in SISO and MIMO Transmission modes.

The LTE network you model from the example configuration file meets the following specifications:

  • A network with 1 eNB, 1EPC, 1 UEs, 1 router, 1 wired node, and 1 > unicast application running on the wired node.

  • Set Transport Protocol to UDP in Application icon present in the top > ribbon/toolbar.

NetSim uses the following defaults for this example:

  • Each one the unicast applications transmit data at a constant > bit-rate from Wired_Node_4 to the UEs.

  • Simulation runs for 2 seconds.

To simulate the example for SISO and MIMO in an LTE network in NetSim:

Open NetSim and Select Examples > LTE and LTE-A > LTE MIMO then click on the tile in the middle panel to load the example as shown in below screenshot Figure 4‑1.

Graphical user interface, application Description automatically generated

Figure 4‑1: List of scenarios for the example of LTE MIMO

The following network diagram illustrates what the NetSim UI displays when you open the example configuration file as shown Figure 4‑2.

Figure 4‑2: Network set up for studying the LTE MIMO

  1. See that by default, NetSim has set all the wired link speeds to 1000 Mbps. To do so:
  1. Right-click the wired link between the eNB and the EPC and click > Properties.

The Link Properties pop-up window appears.

  1. NetSim has specified a value of 1000 in the > Max_Uplink_Speed(Mbps) and the Max_Downlink_Speed(Mbps) > fields and set Uplink and Downlink BER is 0.0000001

  2. Click OK.

  3. Repeat steps (a) to (c) for the wired links between the EPC and the > router and the router and the wired node.

  1. See that by default, NetSim has created unicast applications and specified some default settings. To do so:
  1. Click the Application icon located on the toolbar.

The Configure Application pop-up window appears.

  1. Click Application1 in the left area.

  2. Source_ID drop-down list is set to 5.

  3. Destination_ID drop-down list is set to 3.

  4. Application Strat time is 1 Sec.

  5. Scroll down and see that NetSim has specified 1460 in the > Value (Bytes) in the PACKET SIZE area.

  6. Set Transport Protocol to UDP

  7. NetSim has specified 129.78 in the Value (micro sec) in the > INTER ARRIVAL TIME area.

  8. Click OK.

Figure 4‑3: Application properties Window

  1. Go to eNB properties Interface (LTE) PHYSICAL_LAYER.
Properties
CA1

DL: UL Ratio – 4:1

Bandwidth – 5 MHz

CA2

DL: UL Ratio – 4:1

Bandwidth – 10 MHz

TX Antenna Count

RX Antenna Count

1 For Both eNB and UE

1 For Both eNB and UE

Pathloss Model 3GPPTR38.901-7.4.1
Outdoor_Scenario RURAL_MACRO
LOS_NLOS_Selection USER_DEFINED
LOS_Probabillity 1
Shadow Fading Model None
Fading and Beamforming NO_FADING
O2I Building Penetration Model None

Table 4‑1: eNB >Interface (LTE) >Physical layer properties

  1. Simulate the LTE MIMO for LTE example. To do so:
  1. Click the Run icon located on the toolbar.

The Run Simulation pop-up window appears.

  1. Retain the default settings in the Simulation Configuration tab > (Simulation Time = 2 Sec).

  2. Click OK.

Results and Discussion

After NetSim simulates the LTE MIMO for LTE example, NetSim displays the Simulation Results window.

Interpret the results. To do so, see the values of the throughputs of the applications in the Throughput (Mbps) column, in the Application_Metrics_Table window.

You will see the following throughout values for Application_1 is 21.47 Mbps.

Figure 4‑4: Application Metrics Table in Result window

The Application_Throughput (Mbps) column in the table lists the values of throughput for the different values of Tx_Antennas_Count, and Rx_Antennas_Count values.

Number of Tx and Rx Antennas Count for eNB and UE Application_Throughput (Mbps)
LTE MIMO 1*1 1*1 21.47
LTE MIMO 2*2 2*2 42.94
LTE MIMO 4*1 2*4 85.81

Table 4‑2: Results Comparison

Note: The values of throughputs you see with the different values of Tx_Antennas_Count, and Rx_Antennas_Count values may change the position of the nodes.