CS PROTOCOL ARCHITECTURE DETAILS in - UTRAN LOGICAL INTERFACE,
• Circuit switched domain supports circuit switched services like voice and fax.
• It can also provide intelligent services such as voice mail and free phone.
• The circuit switched elements of the UMTS core network architecture include the following network entities:
• Mobile switching centre (MSC): This is essentially the same as that within GSM, and it manages the circuit switched calls under way.
• Gateway MSC (GMSC): This is effectively the interface to the external networks.
Iu- interface: CS Protocol Architecture
• Radio Network Control Plane
• Transport Network Control Plane
• User Plane
• In UMTS, the interface between RAN and CN is Iu. Iu- CS is the interface specified between the RAN and the 3G-MSC.
• The three planes in the Iu- CS interface share a common ATM ( Asynchronous Transfer Mode) transport.
• Physical layer is the interface to physical medium such
• Optical fiber
• Radio Link
Copper cable
• Control Plane :
• Control plane protocol stack consists of RANAP, on the top of broadband (BB), SS7 (Signaling system 7) protocols. The applicable layers are
• Signaling Connection Control Part (SCCP)
• Message Transfer Part (MTP3 – B)
• SAAL-NNI ( Signaling ATM Adaptation Layer for Network to Network Interfaces)
• The SAAL – NNI is further divided into
Service Specific Coordination Function (SSCF)
Service Specific Connection Oriented Protocol (SSCOP)
ATM Adaptation Layer 5 (AAL5) Layers
• The SSCF and SSCOP layers are designed for signaling transport in ATM networks and take care of signaling connection management. AAL5 is used for segmenting the data to ATM cells.
• Above the ATM layer, we have find an ATM adaptation Layer (AAL).
• The AAL process the data from higher layers for ATM transmission.
• It can segment the data into 48-byte chunks and reassemble the original data frames on the receiving side.
• There are five different AALs ( 0,1,2, 3/4, and 5). Among that, Iu interface uses only AAL2 and AAL5.
• Both are used in Iu – CS interface.
• The transport network control plane carries information for the control of transport network used within UCN.
• Transport network control plane protocol stack consists of
• Signaling protocol on TOP of BB SS7 protocols for setting up
AAL2 Connection (Q2630.1)
Adaptation Layer (Q2150.1[AAL2 signaling transport converter for MTP 3b])
The user plane carries user voice and packet data information.
A dedicated AAL2 connection is reserved for each individual CS service.
In Iu – CS interface, user plane protocol residing directly on TOP of AAL2.
AAL2 is used as the data bearer. AAL2 has been specifically designed to transport short length packets.
The AAL2 is used for the following services.
Narrowband speech.
Unrestricted digital information service.
Any low to average bit rate CS service.
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