Frequency Reuse

NetSim supports FR1 (\(N_{reuse} = 1)\ \)and FR3 (\(N_{reuse} = 3)\) configurations.

Figure 1a
Figure 1b
_images/Figure-1c.png

Figure-1: The 7-cell and 19-cell cases for FR1 and FR3

With NetSim GUI, users can configure the number of beams (1, 7, and 19) and select the frequency reuse factor (FRF) accordingly. When \(N_{reuse} > 1\), NetSim assigns virtual “channel IDs” (colors in the figure above) to the beams. The available resources and bandwidth are then equally divided among the channels, considering the guard band for accurate resource allocation per beam. The bandwidth per channel is calculated per the following expression

\[BW_{channel} = \ \frac{{BW}_{Total}\ - \left( N_{channels}\ - 1 \right) \times {BW}_{GuardBand}}{N_{channels}}\]

In NetSim, the centre frequencies of all channels remain the same, even though, in real-world deployments, each channel would have a different centre frequency.

Example: Consider an S-band system with a 2 GHz carrier frequency and 30 MHz bandwidth, using a frequency reuse factor (FRF) of 3. Each channel is allocated bandwidth while maintaining a 500 KHz guard band.

\(BW_{channel} = \frac{30 - (3 - 1) \times 0}{3} = \frac{30}{3} = 10\ MHz\).

Based on the number of beams and the FRF, the NetSim automatically configures the beam IDs, beam center coordinates, and assigned channel IDs.