Performance Comparison of Practical Resource Allocation Schemes for Device-to-Device Communications

Figure 2

An example of a D2D transmission with dedicated resource. The D2D Tx node selects the transmission mode (cellular mode or D2D mode) according to the channel gain measurements towards the D2D Rx node and towards the BS. If the channel gain between the D2D pair is higher than the one towards the BS, then the D2D mode is selected.