Basic definitions
RSSI - received signal strength indicator
SINR - signal to interference plus noise ratio
\[ \mathsf{SINR(x)=\frac{P}{I+N}} \]
| Signal quality | RSSI | SINR (dB) | RSRQ (dB) | RSRP (dB) | EC/Io (dB) |
|---|---|---|---|---|---|
| Excellent | > -65 | > 12.5 | > -5 | > -84 | > -2 |
| Good | -65 — -75 | 10 — 12.5 | -6 — -10 | -65 — -102 | -2 — -5 |
| Fair | -75 — -85 | 7 — 10 | -6 — -10 | -103 — -111 | -5 — -10 |
| Poor | < -85 | 7 | -11 | < -112 | < -10 |
1 Table source
\[ \begin{align} \nabla \times \vec{\mathbf{B}} -\, \frac1c\, \frac{\partial\vec{\mathbf{E}}}{\partial t} & = \frac{4\pi}{c}\vec{\mathbf{j}} \newline \nabla \cdot \vec{\mathbf{E}} & = 4 \pi \rho \newline \nabla \times \vec{\mathbf{E}}\, +\, \frac1c\, \frac{\partial\vec{\mathbf{B}}}{\partial t} & = \vec{\mathbf{0}} \newline \nabla \cdot \vec{\mathbf{B}} & = 0 \end{align} \]