umts system architecture

7/28/2019 UMTS System Architecture

http://slidepdf.com/reader/full/umts-system-architecture 1/25

Presented by

Andrés Mauricio Ruiz GomezMagister in Electronic Engineer

January 2013



Aims of PresentationTo achieve a general understanding of UMTS system

To identify the different UMTS network elements andarchitectureUE: User EquipmentUTRAN: UMTS Terrestrial Radio Access Network

Core Network



UMTS: A Brief OverviewIt is a Universal Mobile Telecommunication System

designed to provide seamless telecommunicationservices with enhancement in quality, data, rate, reliability,connectivity, system interfaces adaptability, current andnext generation technologies.



UMTS Architecture

Figure 1. UMTS Basic Architecture [ 2.]



User Equipment (UE)It is made up by Mobile Equipment (ME) and UMTS SubscriberIdentity Module (USIM)

The USIM contains user-specific information and theauthentication and encryption keys that authenticates a user'saccess to a network. Whereas, in the ME are the protocol stack of the radio interface as well as the operating elements for the userinterface.



The USIM domain and the ME domain form theUser Equipment Domain. User Equipment Domain handles the access of the

user onto the UMTS services

User Equipment Domain

Figure 2 . User Equipment Domain [ 3.]



Radio Access Network: UTRANIt is the network infrastructure that contains the facilities for transmittingover radio.

The UTRAN contains two types of nodes:

The Radio Network Controller (RNC) , which controls resource managementin one or more base stations (Node B). Handoff decisions, congestion control,power control, encryption, admission control, protocol conversion

Node B performs the air interface processing (channel coding, rate adaptation,spreading, synchronization, power control). It is able to manage one or moreradio cells using WCDMA.

All nodes and functions of the Radio Access Network (RAN) are contained inthe Access Network domain . (See Figure 3)



Core Network (CN)The Core Network (CN) is the long-range network thattransports a user‘s data to its respective destination.

The CN contains a multitude of switching systems as wellas gateways to other networks such as PSTN/ISDNnetworks or the Internet.



The Serving Network domain contains the functions of the specific CN that a user uses at a specific point in timefor access to UMTS services.The Transit Network domain contains the functions of transit networks.The Home Network domain functionality and

information which is independent of actual userlocation .The Access Network Domain Physical entities managingthe resources of the access network

Core Network Domain (CN)



Core Network Domain (CN)

Figure 3 . Infrastructure Domain [ 3.]

These three domains are combined into the CoreNetwork domain. Together with the Access Networkdomain they form the Infrastructure domain.



Types of Switching

In UMTS networks exist mainly two possibilities forexchanging information:

Circuit Switched Domain.Packet Switched Domain.

UMTS networks support both types of switching, in eachcase with special nodes in the CN. Both parts of the CN use the same Radio Access Network ( RAN).



Circuit Switched Domain (CS)This channel remains operational for the entireduration of the transmission. After all informationhas been transmitted, the channel is released again.

Figure4. Circuit Switching [ 1].



Packet Switched Domain (PS)Each individual packet is provided with a destinationaddress so that it can be transmitted individually through the intermediate stations.

Figure5

. Packet Switching [ 1].



Architecture of The Access Plane

Figure 6 . UMTS Architecture [ 4].



Mobile Switching Center (MSC) and

Gateway Mobile SwitchingCenter(GMSC)The Mobile Switching Centre (MSC) is a switching node

that supports circuit-switched connections. It has thefollowing functions:

Routing of interlocutorsLocalization ProceduresHangover Procedures

The Gateway Mobile Switching Centre (GMSC) is ainterface to external networks.



Home Location Register (HLR)The database storing the master copy of a users profile.

It has the following functions:

Subscriber InformationCurrent Visitor Location Register (VLR), SGSN.Service-Specific informations/authorizations.



Serving GPRS Support Node (SGSN)The Serving GPRS Support Node (SGSN) carries out

tasks for packet-switched transmission. It has thefollowing functions:

Subscriber information

Micro mobility



Gateway GPRS Support Node (GGSN)

The gateways to other packet data networks, such asthe Internet, are connected to the Gateway GPRSSupport Node (GGSN). The GGSN usually incorporates a firewall.

Endpoint of the IP - Tunnel

Macro mobility



Radio Network Controller (RNC)The Radio Network Controller (RNC) is the central node in a radio accessnetwork and assumes the management of the resources in all attached cells(channel allocation, handover, power control). The main responsibilities of RNC are he following:

Call admission control.Radio resource management.Radio bearer setup and release.Code allocation.Power control.Packet schedulingHangover.Encryption.Protocol Conversion ATM switching



Node B Acts as the radio base station (BTS in GSM). Thereare three types of Node B corresponding to the twoUTRA modes: UTRA-FDD Node B, UTRA-TDDNode B and Dual-mode Node B.

The main functions of Node B are the following:

Inner loop power control, synchronizationLayer 1 task.(PHY)



In UMTS there are mainly three different types of handover.

Handover in UMTS

Figure 7. UMTS Basic Architecture [ 1.]



UMTS Protocol Stack for Packet

Switching

Figure 8. UMTS Protocol Stack for Packet Switching [ 4.]



UMTS Protocol Stack for Circuit

Switching

Figure 9. UMTS Protocol Stack for Circuit Switching [ 4.]



References

[1] . B Walke, R Seidenberg, M. P. Althoff. UMTS The fundamentals, Wiley 2003 .[2] . Singh M., UMTS: Universal Mobile Telecommunications System. Power Point

Presentation available onhttp://www.authorstream.com/Presentation/3627946-186342-umts-science-technology-

ppt-powerpoint/[3]. Communication Systems UMTS network architecture and interfaces, Power Point

Presentation available onhttps://www.google.com.co/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0CD8QFjAB&url=http%3A%2F%2Felectures.informatik.uni-freiburg.de%2Fportal%2Fdownload%2F15%2F8824%2F12_1_UMTS.ppt&ei=XM70UJemCITa8wSBl4DgAg&usg=AFQjCNHFWbJ5_fxU5DD-UnLSuvOmQ7-hPw&sig2=5GrOowqNgdivWVO62oLMIA&bvm=bv.41018144,d.eWU.

[4]. UMTS Protocols and architecture, PDF document available onhttp://www.cs.ucy.ac.cy/courses/EPL657/pitsillides_slides_2009/EPL%20657%20UMTS-protocols%20and%20architecture.pdf



THANK YOU

umts system architecture

Documents