MPLS is increasingly being used for mobile backhaul networks to support evolving 4G LTE and beyond networks. MPLS provides a unified transport solution for 2G, 3G and 4G networks through proven scalability, resiliency, manageability and quality of service. The Broadband Forum's MPLS in Mobile Backhaul Initiative (MMBI) specifies requirements and architectures for using MPLS in mobile backhaul networks, including support for small cell deployments. Upcoming work will address additional 3GPP releases and further optimize MPLS mobile backhaul networks.