| LTE | Long Term Evolution |
| LTE-M | Long Term Evolution for Metro |
| CBTC | Communication Based Train Control |
| TAU | Train Access Unit |
| ICI | Inter-Cell Interference |
| PL | Path Loss |
| FFR | Fractional Frequency Reuse |
| SFR | Soft Frequency Reuse |
| OI | Overload Indicator |
| HII | High Interference Indicator |
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