The following describe the OFDMA DL algorithm presented in Section 9.7.
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- 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 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
Unit |
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body | $P_{BS}^{UE}=P_{BS}^{Max}\frac{N}{M}$ |
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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 (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 to
- For the k-th active UE in the j-th cell (i.e. ) its C/I is denoted by
Unit |
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body | $\frac{C(j,k)}{I(j,k)}$ |
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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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