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A15.5
A15.5
The following describe the OFDMA UL algorithm presented in Section ‎9.8.

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  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 by default, namely, all available RBs will be allocated to active UEs. And each UE is scheduled with the same number N of RBs. This behaviour can be overridden (see 9.3.6) and the system can be partially loaded, each UE is still scheduled with the same number (
      Mathinline
      body$N$
      ) of RBs.  
  2. Perform UL power control 
  3. Calculate UL C/I for all active UEs in all cells.
    • Loop over all cells from j=1 to Image Removed
      Unit
      body$j=1$
       to 
      Unit
      body${{N}_{cell}}$
       (the number of cells in the system area e.g. 57 for 19 sites with tri-sector antennas)
    • Loop over all active UEs from k=1 to K
      Unit
      body$k=1$
       to
      Unit
      body $K$
    • For the k-th active UE in the j-th cell (i.e. UE_
      Unit
      body $U{{E}_{j,k}}$
      ) its C/I is denoted by Image Removed
      Unit
      body$\frac{C(j,k)}{I(j,k)}$
      .
  4. Determine the throughput for each UE with its C/I according to the link-to-system level mapping.

  5.  Collect statistics.