  In the paper energy dependence of space-time extent of emission region
obtained from Bose - Einstein correlations is studied for charged pions in
various ion collisions for all experimentally available energies. There is no
dramatic change of HBT parameters with increasing of collision energy per
nucleon-nucleon pair, $\sqrt{s_{NN}}$, in domain of energies $\sqrt{s_{NN}}
\geq 5$ GeV. Energy dependence of estimations for emission duration is almost
flat for all energy domain under study within large error bars. Analytic
function is suggested for smooth approximation of energy dependence of main HBT
parameters. Fit curves demonstrate reasonable agreement with experimental data
for most HBT parameters in energy domain $\sqrt{s_{NN}} \geq 5$ GeV.
Estimations of some observables are obtained for energies of the LHC and FCC
project.
