A15.4 OFDMA DL ALGORITHM

The following describe the OFDMA DL algorithm presented in Section ‎9.7.

For i=1:# of snapshots

1. Distribute sufficiently many UEs randomly throughout the system area such that to each cell within the HO margin of 3 dB the same number K of users is allocated as active UEs.

• • Calculate the pathloss from each UE to all cells and find the smallest pathloss
  • Link the UE randomly to a cell to which the pathloss is within the smallest pathloss plus the HO margin of 3 dB
  • Select K UEs randomly from all the UEs linked to one cell as active UEs. These K active UEs will be scheduled during this snapshot.
  • Note: a full load system is assumed, namely, all available resource blocks (RBs) will be allocated to active UEs. And each UE is scheduled with the same number N of RBs. Thus, the BS transmit power per UE is fixed.
    •  Let  denote the maximum transmit power of BS
    •  is the number of all available RBs in each cell
    •  is the transmit power from BS to the active UE, and
    • .

2. Calculate DL C/I for all active UEs in all cells.

• • Loop over all cells from j=1 to  (the number of cells in the system area e.g. 57 for 19 sites with tri-sector antennas)
  • Loop over all active UEs from  to 
  • For the k-th active UE in the j-th cell (i.e. ) its C/I is denoted by ,

3. Determine the throughput for each UE with its C/I according to the link-to-system level mapping.

4. Collect statistics.