Figure 1: A D2D-enabled cellular network with three cellular pairs (PU2, PU5, and PU7) and five D2D pairs (PU1, PU3, PU4, PU6, and PU8). Three of the D2D pairs (PU1, PU3, and PU4) use inband access and two D2D pairs (PU6, PU8) are allocated with the unlicensed channels. In this example, different cellular and D2D pairs interfere with each other when transmitting over RB2 (where PU2 interferes with PU1), RB3 (PU1 interferes with PU5), RB4 (PU5 interferes with PU3), RB5 (PU7 interferes with PU3), and RB6 (PU4 interferes with PU7).