EC8004 wireless networks unit 3 UTRAN
- 1. OVERVIEW OF UMTS TERRESTRIAL RADIO ACCESS NETWORK (UTRAN)
- 2. OVERVIEW OF UMTS TERRESTRIAL RADIO ACCESS NETWORK (UTRAN) UTRAN consists of a set of radio network subsystems (RNSs) The RNS has two main logical elements: Node B RNC (Radio Network Controller) RNS is responsible for the radio resources and transmission/reception in a set of cells.
- 3. RNC (Radio Network Controller) An RNC is responsible for the use and allocation of all the radio resources of the RNS to which it belongs. The RNC also handles the user voice and packet data traffic, performing the actions on the user data streams that are necessary to access the radio bearers. A Node B is responsible for radio transmission and reception in one or more cells to/from the user equipment (UE). Node B
- 4. A. UTRAN LOGICAL INTERFACES APPLICATION PROTOCOL 1.Radio Access Network Application Part (RANAP) in Iu, 2.Radio Network Subsystem Application Part (RNSAP) in Iur 3.Node B Application Part (NBAP) in Iub).
- 5. A. UTRAN LOGICAL INTERFACES The protocol structure contains two main layers, Radio network layer (RNL) – allows communication between UTRAN and Core Network. Transport network layer (TNL) - allows communication between UE and UTRAN. Each of the layers is again divided into two planes. Control Plane User Plane The control plane is used for all UMTS-specific control signaling. The application protocol is used for setting up bearers to the UE. The user plane includes data streams, and data bearers for data streams.
- 6. Iu Interface
- 7. The control plane protocol stack consists of RANAP on the top of signaling system 7 (SS7) protocols. The protocol layers are, Signaling Connection Control Part (SCCP) Message Transfer Part (MTP3-B) Signaling Asynchronous Transfer Mode (ATM) Adaptation Layer for Network-to-Network Interface (SAAL-NNI). The SAAL-NNI is divided into 3 layers 1. Service-Specific Coordination Function (SSCF) 2. Service-Specific Connection-Oriented Protocol (SSCOP) 3. ATM Adaptation Layer 5 (AAL5) The IP-based signaling bearer consists of MTP3—User Adaptation layer (M3UA), Simple Control Transmission Protocol (SCTP) IP AAL5
- 8. Iur Interface: The connection between two RNCs (serving RNC (SRNC) and drift RNC (DRNC)) is the Iur interface.
- 9. Iub Interface: The connection between the RNC and Node B is the Iub interface. There is one Iub interface for each Node B.