  In TeV scale B-L extension of the standard model with inverse seesaw, the
Yukawa coupling of right-handed neutrinos can be of order one. This implies
that the out of equilibrium condition for leptogenesis within standard
cosmology is not satisfied. We provide two scenarios for overcoming this
problem and generating the desired value of the baryon asymmetry of the
Universe. The first scenario is based on extra-dimensional braneworld effects
that modify the Friedman equation. We show that in this case the value of the
baryon asymmetry of the Universe constrains the five-dimensional Planck mass to
be of order O(100) TeV. In the second scenario a non-thermal right-handed
neutrino produced by the decay of inflaton is assumed. We emphasize that in
this case, it is possible to generate the required baryon asymmetry of the
Universe for TeV scale right-handed neutrinos.
