Inherit all the services and functions of 2G ( GSM and GPRS ) CN is composed of CS domain and PS domain Adopt WCDMA UTRAN Iu interface between RAN and CN is based on ATM
Inherit all the services and functions of R99 CS domain change: control is separated from bearer, the function of MSC can be fulfilled by MSC SERVER and MGW. Packet voice supported by CS domain, supporting ATM, IP, TDM bearer
Inherit all the services and functions of R4
IM domain is adopted
RAN evolved to IP
Enhanced IP QoS ability , supporting end to end IP multimedia service service
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