The main transport network in 2G systems
such as GSM networks relies on Time Division Multiplexing (TDM) technology.
As network evolution movement towards a
multimedia and data-centric solution is getting faster the current transport
backhaul cannot meet data service requirements.
TDM based transport technology was originally developed for circuit-switched
(CS) services and therefore, is too limited to fit the flexibility and
efficiency needed for data services.
On the other hand, the starting point for
developing the UMTS air interface was based on the assumption that the majority
of services will be bursty.
The above mentioned limitations drove the
development of alternative transport technologies for UMTS networks.
Two alternative solutions were considered
at the start of network development the favored choice was ATM
and IP
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