Feng Gang National Laboratory of Communication,UESTC Aug 2017 Ver 1.4 TE from Control Perspective Optimization is network control Can be pro-active or reactive Input to the control system Network state variables,policy variables and decision variables Responses to network events are at several levels of temporal resolution Coarse temporal level S Capacity planning,days to years Intermediate level Routing,milliseconds to days Very fine level S Packet level processing (rate shaping,queue management,scheduling), picoseconds to milliseconds 2616009:Network Traffic Engineering Unit 9:Traffic Engineering Page.72616009: Network Traffic Engineering Feng Gang National Laboratory of Communication, UESTC Aug 2017 Ver 1.4 Unit 9: Traffic Engineering Page.7 TE from Control Perspective • Optimization is network control • Can be pro-active or reactive • Input to the control system - Network state variables, policy variables and decision variables • Responses to network events are at several levels of temporal resolution - Coarse temporal level §Capacity planning, days to years - Intermediate level §Routing, milliseconds to days - Very fine level §Packet level processing (rate shaping, queue management, scheduling), picoseconds to milliseconds