009 WCDMA UTRAN Interface and Signaling Procedure

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Transcript of 009 WCDMA UTRAN Interface and Signaling Procedure

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    WCDMA UTRAN Interface and SignalingProcedure

    Huawei Technologies Co., Ltd.

    All rights reserved

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    Revision Record

    Date Version Change descriptionAuthor

    03-06-2007 1B Victor Toledo

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    Table of Contents

    1 UTRAN Network Overview .....................................................................................................71.1 The position of UTRAN in WCDMA Network.............................................................. 7

    1.2 UMTS Construction.....................................................................................................71.3 UMTS Structure...........................................................................................................91.4 Uu Interface...............................................................................................................101.5 General Protocol Model for UTRAN Terrestrial Interface .........................................161.6 Iu-CS Interface .........................................................................................................191.7 Iu-PS Interface...........................................................................................................211.8 Iub Interface...............................................................................................................221.9 Iur Interface ...............................................................................................................23

    2 Basic Concepts About UTRAN.............................................................................................242.1 SRNC and DRNC......................................................................................................242.2 CRNC .........................................................................................................................252.3 RAB, RB and RL ........................................................................................................262.4 UE Working Modes and States..................................................................................26

    2.5 UE states figure..........................................................................................................313 UTRAN Signaling Procedure................................................................................................333.1 Cell Setup ..................................................................................................................333.2 System Information Broadcast..................................................................................343.3 Paging ......................................................................................................................393.4 Call Process ..............................................................................................................413.5 Handover ..................................................................................................................55

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    Objectives

    Upon completion of this course, you will be able to:

    Understand UTRAN interface and structure

    Understand the definitions about UTRAN network elements

    Understand UTRAN signaling procedure

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    1 UTRAN Network Overview

    1.1 The Position of UTRAN in WCDMA Network

    Figure 1. - WCDMA Network.

    Service manager layer

    Service convergence layer

    Radio access layer

    1.2 UMTS Construction

    Figure 2. - WCDMA Network Architecture.

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    WCDMA network architectureshown in picture above

    UE (User Equipment)

    The User Equipment (UE) consists of two parts:

    1. The mobile equipment (ME) is the radio terminal used for radio communicationover the Uu interface

    2. The UMTS Subscriber Identity Module (USIM) is the equivalent smartcard toSIM in GSM. It holds the subscriber identity, performs authentication algorithm,stores authentication and encryption keys, etc.

    UTRAN (UMTS Terrestrial Radio Access network)

    The UTRAN consists of one or several Radio Network Subsystem (RNS), eachcontaining one RNC and one or several NodeB.

    1. NodeB

    The NodeB is the correspondent element to the BTS in GSM.

    2. RNC

    The Radio Network Controller (RNC) owns and controls the radio resources ofthe connected NodeB.

    CN (Core Network)

    Core network (CN) includes a lot of equipments such as MSC ,HLR,SGSN,GGSN,AUC,VLR etc.

    Interfaces

    Iu interface

    The Iu interface connects the UTRAN to the CN and is split in two parts. TheIucs is the interface between the RNC and the circuit switched domain of the CN.The Iups interface is the interface between the RNC and the packet switched domainof the CN.

    Uu interface

    The Uu interface is the WCDMA radio interface with in UMTS. It is the interfacethrough which the UE accesses the fixed part of the network.

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    1.3 UMTS Structure

    Figure 3. - UMTS Structure.

    UTRAN (UMTS Terrestrial Radio Access network) structure

    The UTRAN consists of one or several Radio Network Subsystem ( RNS ) ,eachcontaining one RNC and one or several NodeB.

    Interfaces

    Iu interface

    The Iu interface connects the UTRAN to the CN and is split in two parts. TheIucs is the interface between the RNC and the circuit switched domain of the CN.The Iups interface is the interface between the RNC and the packet switched domainof the CN.

    Uu interface

    The Uu interface is the WCDMA radio interface with in UMTS. It is the interfacethrough which the UE accesses the fixed part of the network.

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    Iub interface

    The Iub interface connects the NodeB and the RNC. Contrarily to GSM, thisinterface is fully open in UMTS and thus more competition is expected.

    Iur interface

    This RNC-RNC interface was initially designed in order to provide inter RNC softhandover, but more features were added during the development.

    1.4 Uu Interface

    Figure 4.- Protocol Stack for Uu.

    The radio interface (Uu) is layered into three protocol layers:

    The physical layer (L1).

    The data link layer (L2).

    The network layer (L3).

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    The layer 1 supports all functions required for the transmission of bit streams onthe physical medium. It is also in charge of measurements function consisting inindicating to higher layers, for example, Frame Error Rate (FER), Signal toInterference Ratio (SIR), interference power, transmit power, It is basicallycomposed of a layer 1 management entity, a transport channel entity, and a

    physical channel entity.

    The layer 2 protocol is responsible for providing functions such as mapping,ciphering, retransmission and segmentation. It is made of four sublayers: MAC(Medium Access Control), RLC (Radio Link Control), PDCP (Packet DataConvergence Protocol) and BMC (Broadcast/Multicast Control).

    The layer 3 is split into 2 parts: the access stratum and the non access stratum.The access stratum part is made of RRC (Radio Resource Control) entity andduplication avoidance entity. The non access stratum part is made of CC, MM parts.

    Not shown on the figure are connections between RRC and all the other protocollayers (RLC, MAC, PDCP, BMC and L1), which provide local inter-layer controlservices.

    The protocol layers are located in the UE and the peer entities are in the node Bor the RNC.`

    The radio interface (Uu) is spitted into 2 pla