This study proposes to jointly utilize virtual distributed unit (vDU) and central unit (vCU) hot backup and Packet Data Convergence Protocol (PDCP) filtering to shorten the fronthaul connection recovery time upon virtualized function failure and reduce the required backup capacity during normal working conditions. Experimental results show that the proposed method achieves about three seconds fronthaul recovery time and reduces up to 95% the fronthaul backup connection capacity requirements.
