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A15.4
A15.4
The following describe the OFDMA DL algorithm presented in Section ‎9.7.

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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  of 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  active 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  of N of RBs. Thus, the BS transmit power per UE is fixed.
      •  Let  denotes
        Unit
        body$P_{BS}^{Max}$
         denote the maximum transmit power of BS
      • Unit
        body$M=N\times K$
         is the number of all available RBs in each cell
      • Unit
        body$P_{BS}^{UE}$
         is the transmit power from BS to the active UE, and
      • Unit
        body$P_{BS}^{UE}=P_{BS}^{Max}\frac{N}{M}$
        .

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

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    • Loop over all cells from  to 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  tofrom 
      Unit
      body$k=1$
       to 
      Unit
      body$K$
    • For the k-th active UE in the j-th cell (i.e. 
      Unit
      body$U{{E}_{j,k}}$
      ) its C/I is denoted by
      Unit
      body$\frac{C(j,k)}{I(j,k)}$
      ,

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

4. Collect statistics.

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