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We consider the focusing $\dot H^{s_c}$-critical biharmonic Schr\"odingerequation, and prove a global wellposedness and scattering result for the radialdata $u_0\in H^2(\mathbb R^N)$ satisfying $M(u_0)^{\frac{2-s_c}{s_c}}E(u_0)<M(Q)^{\frac{2-s_c}{s_c}}E(Q) $ and $\|u_{0}\|^{\frac{2-s_c}{s_c}}_{2}\|\Deltau_{0}\|_{2}<\|Q\|^{\frac{2-s_c}{s_c}}_{2}\|\Delta Q\|_{2}, $ where$s_c\in(0,2)$ and $Q$ is the ground state of $\Delta^2Q+(2-s_c)Q-|Q|^{p-1}Q=0$.

Scattering for the focusing $L^{2}$ -supercritical and $\dot H^2$-subcritical biharmonic NLS Equations