QoS in transport — DiffServ and MPLS TE

DiffServ for Mobile Transport

Differentiated Services provides per-hop QoS treatment by classifying packets into behavior aggregates marked with a 6-bit DSCP value in the IP header or the 3-bit Traffic Class field in the MPLS label. Mobile transport typically defines four to six traffic classes: real-time voice and IMS signaling mapped to Expedited Forwarding, low-latency control plane traffic like N2/S1-AP to Assured Forwarding class AF41, user-plane data to AF classes based on 5QI priority, network synchronization to a dedicated high-priority class, and OAM traffic to a best-effort class. Each class receives specific…