| BS maintains variables and as explained below |
| BS maintains (from e.g. D2D discovery algorithms) the |
| D2D candidates for mode selection and |
| the value of large scale fading (path gain) |
| between each D2D candidate, which |
| can be updated on the slow time scale (e.g. 500 ms). |
| for all resource blocks PRB- () |
| if there are cellular UEs in the cell then |
| Allocate orthogonal resources (PRB) to cellular-UEs |
| (using legacy algorithms) |
| Set for PRB:s assigned to UEs |
| For CPA: Store , where is the path gain |
| between cellular UE using PRB- and the serving |
| BS |
| end if |
| for each D2D candidate do |
| where is the total number of |
| resource blocks |
| if then |
| there is an orthogonal resource- left: Schedule |
| D2D on orthogonal resource- |
| if then |
| D2D candidate transmits in D2D-Mode on |
| resource- |
| else |
| D2D candidate transmits in Cellular-Mode on |
| resource- |
| For CPA: Store , where is the path |
| gain between the D2D transmitter in cellular |
| mode using PRB- and the serving BS |
| end if |
| else |
| Resource Reuse |
| Select a resource- out of the resources for which |
|
| For the CPA algorithm: Substitute the above by: |
| Pick the resource- out of the resources for which |
| for which , where |
| is the path gain between the cellular |
| transmitter using PRB- and the BS |
| D2D candidate transmits in D2D-Mode on |
| resource- |
| end if |
| Increment |
| end for |
