The second phase of the Unified MPLS for Mobile Transport system architecture continues to evolve the mobile backhaul infrastructure design first outlined in UMMT 1.0. The UMMT 2.0 system continues to provide the architectural baseline for creating a scalable, resilient, and manageable mobile backhaul infrastructure that is optimized to seamlessly interwork with the mobile core. The system is designed to concurrently support multiple generations (2G/3G/4G) of mobile services on a single converged network with pseudowire emulation (PWE) for 2G GSM and 3G UMTS/ATM transport, L2VPNs for 3G UMTS/IP, and L3VPNs for 3G UMTS/IP and 4G LTE transport. It supports essential features like network synchronization (physical layer and packet based), H-QoS, OAM, performance management, and fast convergence. It is optimized to cater to advanced 4G requirements like IPSec and authentication, direct eNodeB communication through the X2 interface, multicast for optimized video transport, virtualization for RAN sharing, capability of distributing the EPC gateways, and traffic offload. The architecture is also extensible to a converged mobile and wireline deployment and supports wireline residential, business, retail/wholesale L2VPNs and L3VPNs, and IP services.
