| Parameter | Definition |
| S | Successful slots in a TDMA frame |
| C | Collided slots in a TDMA frame |
| I | Idle slots in a TDMA frame |
| F | Power adjustment factor |
| P0 | Minimum transmission power of a reader |
| Pn | Transmission power in the n-th frame |
| Pn+1 | Transmission power in the (n + 1)-th frame |
| d0 | Radius of a reader’s minimum coverage |
| dn | Radius of a reader’s coverage in the n-th frame |
| dn+1 | Radius of a reader’s coverage in the (n + 1)-th frame |