HUT Comms.
Lab, Timo O. Korhonen
12
UMTS and Differentiated
Services
nUMTS supports wide range of applications that posses different
quality of service (QoS) requirements.
nApplications and services can be divided in different groups, depending on QoS requirements. Four traffic classes
can been identified:
nConversational class (very delay-sensitive traffic)
nStreaming class
nInteractive class
nBackground class (the most delay insensitive)
nHence TCP (Connection-oriented transport-layer ) is not always applied - one may use also UDP (Connectionless transport-layer
protocol) - Why?