![]() The SSCF and SSCOP layers are specifically designed for signaling transport in ATM networks, and take care of signaling connection management functions. The SAAL-NNI is divided into service-specific coordination function ( SSCF), the s ervice-specific connection-oriented protocol ( SSCOP), and ATM adaptation layer 5 ( AAL5) layers. The protocol layers are the signaling connection control part ( SCCP), the message transfer part ( MTP3-B), and signaling asynchronous transfer mode (ATM) adaptation layer for network-to-network interface (SAAL-NNI). The control plane protocol stack consists of RANAP on the top of signaling system 7 (SS7) protocols. CS protocol architecture on I u interface. The PS domain is expected to evolve from the GPRS PLMN.įigure 15.25. Since Internet connectivity is provided, all services currently available on the Internet such as search engines and e-mail are available to mobile users. Some examples of PS services are Internet access and multimedia services. The CS domain is expected to evolve from the existing 2G GSM PLMN. The CS domain connects to PSTN/ISDN networks. ![]() The CS domain can also provide intelligent services such as voice mail and free phone. ![]() Some examples of CS services are voice and fax. The CS domain supports circuit-switched services. The control plane serves two service domains in the core network, the packet-switched (PS) domain and circuit-switched (CS) domain. It carries user call control (CC) and mobility management (MM) signaling messages. It carries information for control of UTRAN in the context of each specific call. It carries information for the general control of UTRAN radio network operations. The RNCP performs the following functions: The I u interface consists of three different protocol planes - the radio network control plane ( RNCP), the transport network control plane ( TNCP), and the user plane ( UP). On the UTRAN side the I u interface is terminated at the RNC, and at the UCN side it is terminated at U-MSC. The UMTS I u interface is the open logical interface that interconnects one UTRAN to the UMTS core network (UCN). Also, the ALCAP protocols in the transport network control plane are not used to set up the signaling bearer for the application protocol or the ALCAP during real-time operation. This situation occurs when preconfigured data bearers are used. If there is no ALCAP signaling transaction, the transport network control plane is not required. The ALCAP may not be used for all types of data bearers. The independence of the control plane and user plane assumes that an ALCAP signaling occurs. There is a signaling transaction by application protocol in the control plane that initiates set-up of the data bearer by the ALCAP protocol specific for the user plane technology. With the transport network control plane, the transport bearers for data bearers in the user plane are set up in the following way. The addition of the transport plane in UTRAN allows the application protocol in the radio network control plane to be totally independent of the technology selected for the data bearer in the user plane. The transport plane lies between the control plane and the user plane. It also includes the signaling bearer needed for the ALCAP. It contains access link control application part ( ALCAP) required to set up the transport bearers (data bearers) for the user plane. It does not include radio network layer information. The transport network control plane carries all control signaling within the transport layer. Each data stream is characterized by one or more frame protocols specified for that interface. The user plane includes data stream(s), and data bearer(s) for data stream(s). User information is carried by the user plane. In the three-plane structure the bearer parameters in the application protocol are not directly related to the user plane technology, but rather they are general bearer parameters. The application protocol is used for setting up bearers to the UE. It includes the application protocol (i.e., radio access network application part (RANAP) in I u, radio network subsystem application part (RNSAP) in I ur and node B application part (NBAP) in I ub). The control plane is used for all UMTS-specific control signaling. General protocol model for UTRAN interfaces.
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