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After GSM mobile networks evolve to UMTS R99 networks, the connection modes and service types in an access network change a lot, but in corenetworks the combination of the UMG8900 and the MSC server is still used in the CS domain serving as (G)MSC.
In UMTS R99 networks, the access and core networks are connected by ATM connections through the Iu CS interface. The user plane (UP) transmits voice and narrowband data based on Iu UP , and the control plane (CP) transmits call control messages based on Iu CP .TDM connections exist between MSCs in the core network, and between the core network and PSTN.
The UMG8900 and MSC server function as one (G)MSC in the core network. The UMG8900 can communicate with the MSC server either through internal interfaces or through standard H.248 messages. In this networking mode, the UMG8900 accesses service flows through Iu interfaces. The control signaling from an access network can reach the MSC server directly or be forwarded to the MSC server through the signaling gateway function built in the UMG8900.
Between MSCs in the core network or between the core network GMSC and PSTN, voice services are accessed by the UMG8900, and signaling is transferred to the MSC server by the UMG8900 embedded signaling gateway or semi-permanent connections.
For the signaling of the access network, the UMG8900 adapts it based on MTP3B and M3UA. For the signaling between MSCs or between the core network and PSTN, the UMG8900 adapts it based on M2UA and M3UA.
As the UMG8900 is designed in the bearer independent call control structure and supports TDM/IP/A TMbearer modes, it can help the UMTS R99 network evolve into a UMTS R4/R5/R6 network smoothly .
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