Table 2 System parameters.

Cell size

500 m × 500 m

Nodes

[50, 100, 150, 200, 250]

Mobility

Static

Number of CUEs

10–20

Number of DUEs

15–30

Number of relays

5–25

Number of resource blocks

1–5

Carrier frequency

2.1 GHz

Bandwidth per RB

180 kHz

Minimum data rate requirements

20–30 kbps

Transmission power (BS)

45–55 dBm

Transmission power (D2D)

23 dBm or 0.2 W

Transmission power (Relay)

20 dBm or 0.1 W

SINR threshold

5 dB

Channel model

Rayleigh fading + Log-normal shadowing

Pathloss model

3GPP urban macrocell (TR 38.901)

Noise power density

− 174 dBm/Hz

Mobility model

Random waypoint model