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HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential 2

Object

You will be able to:

WCDMA Network Overview (Basic

Functions)

RAB (Radio Access Bearer)

Network Interfaces, Protocols,

Adaptation Layers

Traffic Handling Examples


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HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

Contents

WCDMA Network Overview (Basic Functions)

Core Network CS Domain (MSC) PS Domain (SGSN, GGSN)

UTRAN (UMTS Terrestrial Radio Access Network) Asynchronous Transfer Mode (ATM)

RAB (Radio Access Bearer)

Network Interfaces, Protocols, Adaptation Layers

OSI Model UMTS Planes

Transport, User, Control Plane Protocols

Traffic Handling Examples


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WCDMA/UMTS Network Architecture


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Security Level:

Core NetworkOverview


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CORE NETWORK ELEMENT OVERVIEW

The CN is responsible for switching and routing calls and data connectionsto external networks.

The CN contains the physical entities that provide support for the networkfeatures and telecommunications services.

It is also responsible for providing the mobility and location on the highest

level of the UE. The SGSN and GGSN are located in the packet switched domain.

There are also some network elements, which are shared by the packetswitched and circuit switched domain. The common network elementscomprise the HLR, AuC and EIR.

A set of network elements were specified for application provisioning, whichcan be also found in the CN. Examples are the Camel Service Environmentand WAP.


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CORE NETWORK ELEMENT OVERVIEW

The CN handles both packet-oriented services (such as data) and circuit-oriented services (such as speech). The UMTS CN can be organised into two main domains:

CS domainThis domain offers circuit switched bearer services. The cs domain is

mainly used for real time data services, including speech and videotransmission. The network entities MSC, GMSC and VLR can be found here.

PS domainThis domain offers packet switched bearer services. It is based on theGSM feature GPRS. This domain was developed for non-real time packet

switched applications, such as file transfer, email, access to the Internet. But there are tendencies to improve its offered QoS, so that real time

services can be offered, too.


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WCDMA/UMTS Network ArchitectureCore Network Interfaces

CIRCUIT SWTICHED CORE

PSTN/Legacy/External

PACKET SWTICHED CORE

SGSN GGSNMultimedia IP

NetworksGn Gi

MGW

MSC GMSC

HLREIR

D

F

AuCC

H

GcGrGf

Gs

RNSTE MT Node B RNCUu Iub

Iur

TE MT Node B RNCUu Iub

R

R

Iu-ps

Iu-cs

MGWIu-cs

Iu-ps


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MSC SERVER FUNCTIONALITY Services

Services Supported by the MSC

Teleservices Telephony (Originating & Terminating), Emergency calls, SMS

Bearer Services The MSC server supports circuit based data up to 64 kbit/s. It is also

possible to use lower bit rates. Supplementary Services

Examples include: Line Identification, Call Forwarding, Call Waiting and CallHold, Multi Party, Closed User, Group, Advice of Charge, Call Barring, Callcompletion to Busy Subscriber, EMLPP (Enhanced Multi-level Precedenceand Preemption).

Unstructured Supplementary Service Data (USSD), as specified in3GPP

IN in CAMEL Customized Applications for Mobile Network Enhanced Logic. The main application of CAMEL is the support of prepaid charging, also

referred to as real-time or on-line charging. Positioning Service

This service indicates the position of the mobile. Positioning is based on thetransfer of geographical coordinates stored in the MSC Server that uses theMAP and CAP protocols. A translation is performed internally between theposition of the cell and the geographical coordinates.

Dynamic Trucking


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MSC SERVER FUNCTIONALITYControl Functions

Connection management The MSC Server handles circuit-based connection management. Iu control

signaling is performed between the MSC Server and UTRAN, while the userplane is set up.

In the event that tones, announcements, connection of transcoders, etc., arerequired, the MSC Server orders the devices to be connected.

Mobility management Roaming: The MSC Server supports mobility management in order to enable

attachment/detachment and roaming within the UMTS network, betweenUMTS networks, and between UMTS and GSM networks.

Handover: The MSC Server supports intra-MSC SRNS relocation, inter-MSCand intra-MSC handover from UMTS to GSM

Security Subscriber authentication, Key agreement, Ciphering, Data integrity,

Negotiation of algorithm

Charging


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MSC SERVER FUNCTIONALITYMedia Streaming

Coding/decoding The Transcoder Unit will provide coding/decoding between UTRAN and the

UMTS circuit-based Core Network and between UTRAN and the externalnetwork.

Echo cancellation Echo cancellers are provided to attenuate echo generated at the conversion

between the 4-wire and 2-wire transmissions in the PSTN and acoustic echogenerated in the user equipment.

Tone handling Devices are provided to send and receive DTMF tones as requested by push-

button signals originating in the user equipment. Devices are provided forsending tones such as ringing tones and busy tones, to the mobile subscriber.

Conference Calls The Conference Call Device (CCD) is provided for bridging multiparty calls.

Announcement machine Announcement Service Terminals (AST) are provided to make announcements

to end-users. Data Transmission Interworking (DTI)

This unit provides a modem pool for circuit-based data leaving the analoguenetworks and for establishing connections


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MSC SERVER FUNCTIONALITY Transport

Transport

The transport functionality controls the physical user plane resources andswitching, and provides interworking between different transport domains.It is also responsible for establishing and releasing user planeconnections.

The transport functionality is as follows: Exchange terminals for STM transport Bearer Control, the Media Gateway function establishes and releases

user plane connections when ordered by the MSC Server. ATM Link Interface (ALI), the ATM Link Interface provides termination

of ATM and AAL2 bearers on the Iu-interface


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SGSN Server

The SGSN handles the communication with MSs and the establishmentof the connection between an MS and the Packet Data Network. It forwards IP packets between all GPRS attached MSs within that SGSN

service area and the GGSN

SGSN Main Functions

Session management Mobility management Subscriber data management Security GGSN control signaling Charging Admission Control MAP and RANAP control signaling SMS


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SGSN SERVER FUNCTIONALITY Description

Session management:SGSN functionality for session management is responsible for establishment,maintenance and release of end user PDP contexts.This includes inter-working with the GGSNs for IP address allocation if dynamicIP addresses are used.Session management also includes functionality for establishment and releaseof WCDMA Radio Access Bearers (RAB) for end user IP data transportation.

Mobility management:Functionality supports intersystem handover within and roaming betweenmobile networks

Subscriber data management:SGSN supports the standardized interface to the HLR for management of end

user subscriber data such as International Mobile Subscriber Identity (IMSI),Access Point Names, Subscribed QoS etc.

Security:It includes subscriber authentication for attach/detach and location updateprocedures.


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SGSN SERVER FUNCTIONALITY Description

GGSN control signaling:

The GTP-C (GPRS Tunneling Protocol ) for control signaling between SGSN andGGSN is supported. GTP-C is transported by UDP/IP and contains functionalityfor SGSN - GGSN tunnel management and control.

Charging:SGSN supports off-line charging with generation of CDRs, and on-line chargingaccording to CAMEL prepaid is supported.

Admission Control:function is handling the control of the following: maximum number of simultaneously attached users in the SGSN maximum bit-rate in the SGSN

The Admission Control function also includes a control of the MS requested QoSprofile against the subscribed QoS profile.

MAP and RANAP control signaling:SGSN supports the RANAP (Radio Access Network Application Part)protocolfor control signaling over the RNC-SGSN interface for establishment and releaseof Radio Access Bearers.

SMS:SGSN treats SMS messages as control traffic, SMS messages can be sent assoon as a control connection has been established and no dedicated RAB isrequired


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SGSN SERVER Interfaces


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GGSN Server

GGSN is effectively the gateway to external data networks.

It forwards uplink and downlink IP packets between the SGSN and thePDN (Public Data Network)

The GGSN handles session management, that is, activation,modification, and deactivation of PDP contexts for sessions between theGGSN and the SGSN, and between the GGSN and the PDN.

Session management also includes dynamic IP address allocation andQoS negotiation.

Supports control signaling towards external IP networks forauthentication and IP address allocation,

Supports mobility within the mobile network. It communicates with one orseveral SGSNs.

The GGSN provides functions for forwarding and handling userinformation (IP packets) to and from external networks(Internet/intranets).


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GGSN Functionality

The main functions of the GGSN are as follows: Session and Mobility management

The GGSN handles establishment, maintenance and release of PDPcontexts that are initiated on request by an SGSN.

The GGSN includes functionality for intra-PLMN and inter-PLMN routing of IPpackets.

IP address allocation

The GGSN is responsible for allocation of dynamic IP addresses. The GGSN can either allocate the IP addresses itself, or interact with a

RADIUS server for end user authentication and retrieval of IP addresses. Dynamic address allocation enables the use of IP addresses from a common

pool of addresses.


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UMTS Terrestrial RadioAccess Network

(UTRAN)


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UTRAN & System Architecture

Logical Architecture


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Logical Architecture

UTRAN & System Architecture


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Hierarchical Architecture

UTRAN Elements: Radio Network Controller Node B (Base Station)

UTRAN consists of a set of Radio Network Subsystems (RNS) connected toCN through Iu

Node B connects to RNC through Iub New Iur interface between RNC for soft handover

UTRAN Architecture


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RNC roles

Concerning one connection between UTRAN and one UE, the following roles

of RNC exists:Serving RNC (SRNC) that control the connections to a UEDrift RNC (DRNC) that lends its resources for the Serving RNC for a particular UE

Each RNC also has the controlling role towards its Node Bs (CRNC). One UE connected to UTRAN has one and only one SRNC One UE may have zero, one or more DRNCs

C


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Responsible for processing of user data Responsible for Radio Resource Management Comparable to Base Station Controller in GSM Key RNC Functions:

Closed loop power control Handover control Admission control Code allocation Packet scheduling Macro diversity combining/splitting over number of Node Bs

RNC Key Functions

N d B K F i


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Comparable to Base Transceiver Station in GSM Responsible for Air Interface Layer 1

Key Node B Functions: Modulation and spreading RF Processing Inner-loop power control Rate matching Macro diversity combining/splitting inside Node B

Node-B Key Functions


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Iucs and Iups provide the control relationships between each of the RNCs and

the CS servers (MSC) and PS servers (SGSN) For IuCS, an RNC can only be controlled by one MSC.

One MSC can control several RNCs. For IuPS, an RNC can only be controlled by one SGSN.

One SGSN can control several RNCs.

The Iu interface, normally uses two parallel STM-1 links connecting the RNC to

the RNSGW in the Core Network. The two links are configured as a redundant pair to protect against both equipment and

transmission link faults. A core network based on Ericsson products uses the Ericsson Media Gateway for Mobile

Networks (M-MGw) to perform the role specified for the RNSGW

Iuc/ps Key Function


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Iur Key Functions

Iur is the Interface connecting 2 RNCs

Supports Inter-RNC Mobility, Soft Handovers Dedicated channel traffic, (user data transfer with dedicated connection) Allow anchoring of SRNC when UE is in Dedicated channel (DCH) state

Common channel traffic Allow anchoring of SRNC and also when UE is in common channel

(RACH/FACH) state

Flow control between SRNC and DRNC Transfer of positioning parameters between controller Transfer of Node B timing information between two RNCs

Anchoring

Iur

The scheduling ofDL data

transmission isperformed inthe DRNC


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Radio AccessBearer


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The user traffic, known as the user plane, is carried through the networkfrom the mobile to the core network on a bearer. In GSM, the traffic channel was the bearer. In UMTS, a bearer is a varied bit rate and is allocated depending on the

needs of the subscriber. The actual data in the bearer is transparent to the network.

Bearer


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Bearer Characteristics

Conversational class

Voice and video

Streaming class

Streaming video

Interactive class

Web browsing

Background class

Mail downloading


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A bearer has different parameters, such as variable data rates,

protection and delay. The bearer is dependent on the service required.

Voice

Voice Messages

Messaging

Transactional

Info services

WWW browsing

Intranet access

Downloading

Audio/Video Streaming

0 8 16 32 48 64 80 96 112 128 256 384 kbit/s

Video telephony

Bearer Types

Relationship between the RAB and Signaling


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Relationship between the RAB and SignalingProtocols

As the bearer is passing through the network elements, we need to control its

activities. One network element must be capable of sending and receiving messages to

other network elements (Node B to RNC, RNC to CN and RNC to RNC). This is called signaling. Standardized signaling protocols specify how two pieces of equipment can

communicate and understand messages.

The figure below illustrates the user plane information between the terminal andthe core network through the network by use of the RAB.


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InterfacesProtocolsAdaptation Layers


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OSI Seven Layer Model

The Open Systems Interconnection (OSI) is a layered Basic Reference Model,

developed for communications and computer network protocol

SDHATMIPTCPRTPHTTPFTP

Example


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UMTS Pl


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Transport plane protocols:Transport plane provides the means how the physical connection is establishedbetween the User Equipment (UE) and the network.Provides a reliable connection between two end nodes. Is responsible for thetransport of higher layer data

User plane protocols:

Protocols implementing the radio access bearer service carrying user data throughthe access stratum (parallel layers).

Control plane protocols:Protocols for controlling the radio bearers and the connection between the UserEquipment (UE) and the network from different aspects (including requesting theservice, controlling different transmission resources, handover, and so on).

UMTS Planes

T t Pl I PS I CS I & I b


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Transport Plane Iu-PS, Iu-CS, Iur, & Iub

Physical Layer

ATM

AAL2Service: Variable bit rate Source & destination

synchronised connection orientated

AAL5Service: Variable bit rate Source & destination

not synchronised connection orientated

control dataIu-CS, Iu-PS, Iur, Iub

user data

Iu-PS

user data

Iu-CS, Iur, Iub

T Pl I b I I I


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Transport Plane Iub, Iur, Iucs, Iups

In the Iub, Iur, Iucs, Iups interfaces the transport plane consists of ATM(Asynchronous Transfer Mode) and its adaptation layer(s) located on top of thephysical layer.

The physical layer could be any media providing constant bit rate with adequatebandwidth, that is, PCM(s), PDH or SDH.

T t l i th U i t f


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Transport plane in the Uu interface

RLC RLC RLC

RRCsignalling

CS RAB

(speech)

PS RAB

(data)

MAC

L1

Iub/IurMAC forCommon

Channels

SegmentationRetransmission across the airCiphering of NRT dataBuffering

Iu

Selection of the data to beinserted in the Radio FrameSelection of common or dedicated channelsMultiplexing of logical channelsinto same transport channels

Ciphering for RT

2. Transport channels

3. Physical Channel(s) (Radio)

1. Logical Channels

RLC: Radio Link ControlMAC: Medium Access Control

RRC, RLC, MAC and Logical, Logical, Transport Channels in more detail when we discuss Air-Interface

Control plane


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Control plane protocols: Protocols for controlling the radio bearers and the connection between the User

Equipment (UE) and the network from different aspects (including requestingthe service, controlling different transmission resources, handover, and so on). Transparent for the transport plane

The following functionality is supported: Control plane functionality including addressing, routing, and connection

admission control to support dynamically (on-demand) establishment andrelease of AAL2 connections.

For each network connection, a CPP-based node can act as an originatingnode, a transit node, or as a destination node.

Management plane functionality to establish and release AAL2 paths (ATMvirtual Channel connection, ATM VCC) Management plane functionality to establish and release permanent cross-

connected ATM VC links Management plane functionality to establish and release permanent ATM VP

terminations

Main protocols: NBAP Node B Application Part - Iub interface

RNSAP/Radio Network Subsystem Application Part

Iur interface RANAP/Radio Access Network Application Part Iu interfaces (CS and PS)

Control plane

Control plane lub interface (NBAP)


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RNCBS

Physical Layer Physical Layer

ATM ATM

AAL5

NBAP NBAP

Convergence Protocol(s) Convergence Protocol(s)

AAL5

Iub

Common NBAP procedures: Create UE contexts (needed

before dedicated signallingprocedures can take place).

Control BCCH informationDedicated NBAP procedures:

Related to specific UE context,examples: Radio link addition,

reconfiguration, deletion Downlink power control

Dedicated measurementsignalling

Control plane lub interface (NBAP)

Si lli l R di li k t


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Signalling example: Radio link setup

RACH-Short Initial Access RRC Connection Request

Radio Link Setup

RRC Conn. Request AckFACH - Access Granted

Radio Link Setup Response

Synchronisation IndicatedUL DPCCH

RNCBSUu Iub

Control plane Iur interface (RNSAP)


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Control plane Iur interface (RNSAP)

DRNCSRNC


ATM ATM

AAL5

RNSAP RNSAP


AAL5

Iur

RNSAP protocol functions Some examples: Radio link management and

supervision Physical channel reconfiguration Measurements, dedicated resources CCCH signalling transfer Paging in URA or cell Etc.

Control plane Iu interface (RANAP)


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Core NetworkDomains

RNC


ATM ATM

AAL5

RANAP RANAP


AAL5

Iu RANAP protocol functions Some examples: RAB management Controlling overload in Iu Paging users Controlling security in UTRAN Location reporting/control Etc.

Control plane Iu interface (RANAP)

User plane


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The user plane signalling takes place between the application(s) of the UE (user)and the destination over the physical connection established over the transportplane by using the facilities the control plane offers.

In the Uu interface the user plane consists of the DPDCHs (Dedicated PhysicalData Channels) allocated for the connection plus the data they carry.

User planes for other interfaces are shown in the following four figures.

User plane

User plane in the lub interface


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RNCBS


ATM ATM

AAL2

Frame Protocols for:

DCH, RACH and FACH

Frame Protocols for:

DCH, RACH and FACH

AAL2

Iub

User plane in the lub interface

User plane in the lur interface


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DRNCSRNC


ATM ATM

AAL2

Frame Protocols for

DCHFrame Protocols for

DCH

AAL2

Iur

User plane in the lur interface

User plane data on the lu CS interface


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Core Network

Circuit Switched Domain

RNC


ATM ATM

AAL2

User Data Streams User Data Streams

AAL2

Iu-CS

User plane data on the lu-CS interface

User plane data on the lu-PS interface


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Core NetworkPacket Switched Domain

RNC


ATM ATM

AAL5

IP

UDP

GTP

User Data Streams

IP

UDP

GTP

User Data Streams

AAL5

Iu-PS

User plane data on the lu-PS interface

Example: RAB establishment (simplified)


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Example: RAB establishment (simplified)

Uu Iub Iu

RAB Assignment Request

RAB Assignment Complete

SGSN

RNCNode B

Iub bearer set-up(AAL 5 virtual channel)

Iub bearer set-up(AAL 2 virtual channel)

Radio Bearer Set-up Complete

Radio Bearer Set-up

Radio Link Reconfiguration

Radio Link Reconfiguration Complete

UE

Summary of UMTS signalling and interfaces


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Summary of UMTS signalling and interfaces

The next two slides summarise the implementationof different interfaces with respect to:

RAN interfaces Core network interfaces

Iub Interface:


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RAN

interfaces

BS Functions:- Modulation- Rate Matching- Error Protection in Uu Interface- Uu Interface Channelisation- Macro Diversity (Softer Handover)

Uu Interface:Transport Plane

Control Plane

User Plane

Procedures

- WCDMA (Wideband CodeDivision Multiple Access)

- DPDCH and DPCCH Channels

- Optimised, application-relatedprotocols suitable for both

packet and circuit switchedtraffic

- Radio Link (RL) Setup- RL Reconfiguration- RL Addition- RL Deletion- Radio Access Bearer Mgmt

Iub Interface:Transport Plane

Control Plane

User Plane

Procedures

- ATM

- Communication Control Ports- Node B Control Ports

- RACH/FACH/DCH Data Portsforming UE Context(s)

- Radio Link (RL) Setup

- RL Reconfiguration- RL Addition- RL Deletion- Power Control Information- Handover Signalling- Measurement Reports

Iur Interface:Transport Plane

Control Plane

User Plane

Procedures

- ATM

- SCCP over CCS7

- Frame Protocols for DedicatedChannels over ATM

- Radio Link (RL) Setup- RL Reconfiguration- RL Addition- RL Deletion- Power Control Information- Handover Signalling- Measurement Reports

Iu Interface for CN Packet Domain:Transport Plane

Control Plane

User Plane

Procedures

- ATM

- RANAP over CCS7 or IP

- GTP (GPRS TunnellingProtocol) over UDP/IPover AAL5

- Radio Access Bearer Management- SRNC Relocation- Direct Transfer Procedures

(Direct Signalling between UEand the CN Packet Domain)

Iu Interface for CN Circuit Domain:Transport Plane

Control Plane

User Plane

Procedures

- ATM

- RANAP over CCS7

- Optimised, application-relatedprotocols over ATM AAL2


(Direct Signalling between UEand the CN Circuit Domain)

BS

BS RNC

RNC

RNC Functions:Radio Resource Management

Telecommunication Management

- Admission Control- Code Allocation- Load Control- Power Control- Handover Control (HO)- Macro Diversity (Soft HO)

- Radio Access Bearer (RAB)- RAB - Radio Link Mapping

Core Network


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Core NetworkInterfaces

HLR&AC&EIR

MSC&VLR GMSC (&VLR)

Iu PSTN

Gi

3G RAN

Iu Interface for CN Packet Domain:Transport Plane

Control Plane

User Plane

Procedures

- ATM

- RANAP over CCS7 or IP

- GTP (GPRS TunnellingProtocol) over UDP/IPover AAL5


(Direct Signalling between UEand the CN Packet Domain)

Iu Interface for CN Circuit Domain: Transport Plane

Control Plane

User Plane

Procedures

- ATM

- RANAP over CCS7

- Optimised, application-relatedprotocols over ATM AAL2


(Direct Signalling between UEand the CN Circuit Domain)

VLR - VLR MM:Transport Plane

Control Plane

User Plane

Procedures

- CCS7

- CCS7 MTP,SCCP and MAP

- Security ParameterTransfer

MSC - MSC Traffic & MM:Transport Plane

Control Plane

User Plane

Procedures

- CCS7

- CCS7 MTP & ISUPand MAP for MM

- Traffic Path Setup (ISUP)- MSC-MSC Handover (MAP)

MSC/VLR - HLR MM:Transport Plane

Control Plane

User Plane

Procedures

- CCS7

- CCS7 MTP,SCCP and MAP

- Location Enquiry- Roaming Nbr Allocation- Location Registration- Security Parameter Alloc.

SGSN - GGSN:Transport Plane

Control Plane

User Plane

- ATM

- IP (GTP)

- IP

GGSN - Public IP:Transport Plane

Control Plane

User Plane

- ATM

- IP

CN Service Domain:Transport Plane

Control Plane

User Plane

- CCS7

- CCS7, MTP,SCCP, MAP,INAP, CAMEL

Security Level:


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TRAFFICHANDLINGExamples

MOBILE ORIGINATED CALL


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MOBILE ORIGINATED CALL

1. A request from the UE for call setup is received in the MSC Server. The MSC Server selects a MGWinterfacing the PSTN.

2. Resources controlled by the MSC-server are reserved in the selected MGW. In this case an ATMinterface and some resources (echo cancellers and speech codec) for manipulating the speech data.

3. The MSC-server orders the RNC to setup a radio access bearer (RAB, a connection all the way up tothe core network).

4. The user plane is setup from the RNC to the MGW interfacing the PSTN.5. The MSC-server is informed by the RNC that the user plane setup to the chosen MGW has been

completed.6. The call setup to the transit server is initiated by the MSC7. Through connection of the equipment controlled by the MSC-server is ordered in the MGW. A chain

of resources for the traffic into the MGW is defined.8. Resources controlled by the transit server are reserved in the selected MGW. In this case a STM

interface where MGW connects to the PSTN9. Call setup to the selected PSTN switch is initiated by the transit server.10. Through connection of the equipment controlled by the transit server is ordered in the MGW. This

completes the chain through the MGW.

MOBILE TERMINATED CALL


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1. A request from PSTN for an incoming call is received in the GMSC-server.2. 2a. The GMSC interrogates the HLR in order to find out which MSC that is in charge of the called

party.2b. Routing data (location area) is obtained from the VLR of that MSCserver.

3. Resources controlled by the GMSC server are reserved in the selected MGW.4. The call setup towards the MSC server is initiated by the GMSCserver.5. Through connection of the equipment controlled by the GMSC server is ordered in the MGW.6. Paging request of the called party is sent from the MSC-server to the RNC. Paging procedures are

initiated by the RNC.7. Resources controlled by the MSC-server are reserved in the selected MGW.8. The MSC-server orders the RNC to setup a radio access bearer.9. The user plane is setup from the RNC to the MGW interfacing the PSTN.10. The RNC informs the MSC server that the user plane setup to the MGW has been completed.11. The MSC server is informed by the UE that alerting of the called party has started.12. The MSC server orders the MGW to start sending ringing tone towards the calling party.13. Answer is received from the called party.14. Through connection of the equipment controlled by the MSC-server is ordered in the MGW.

MOBILE TERMINATED CALL

PDP-CONTEXT ACTIVATION


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PDP-CONTEXT ACTIVATION

A PDP context activation is like logging on to the external IP network and the mobile subscribersidentity will be associated with an IP address.

1. An activate PDP context request is sent by the UE to the SGSN Server.2. The SGSN Server requests the RNC to setup a Radio Access Bearer.3. The RAB is setup including a GTP tunnel (between the RNC and the MGW) and an

acknowledgement is sent to the SGSN.4. The SGSN Server requests the MGW to create a GTP tunnel transfer point and a GTP tunnel to a

GGSN.5. A create PDP context request is sent from the SGSN Server to the GGSN. 6. The GGSN Server requests an IP address from an AAA server (or similar).7. GGSN sends a create PDP context response back to the SGSN Server.8. An activate PDP context response is sent back to the UE from the SGSN Server.

PACKET FORWARDING


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PACKET FORWARDING

1. A PDU is sent from the Ue.

2. The PDU is forwarded over the GTP-U tunnel between the RNC and the MGW.

3. The PDU is forwarded over the core network GTP-U tunnel to the GGSN.

4. The PDU is forwarded to the Internet/ISP-POP

Security Level:


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Back Up Reference

RRC Connection Establishment


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RRC Connection Establishment

Signaling Connection Release


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Signaling Connection Release

Applications/Functions in WCDMA/UMTS


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ppSystems


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Thank You!

01- TATA UMTS Network Overview

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Transcript of 01- TATA UMTS Network Overview