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Ch3 umts network
 

Ch3 umts network

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umts network

umts network

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  • Synchronous Optical NETwork (SONETproposed the idea of an opticalcarrier-to-carrier interface that would allow the interconnectionof different manufacturers’ optical equipment.This was based on a hierarchy of digital rates, allformed by the interleaving of a basic rate signal
  • The new generation of UMTS phones will combine the advantages of wireless communication with the demand for multimedia applications. The continuous increase in transmission speed will bring enormous progress in data transfer. High definition colour screens will make it very easy to view internet graphics or play realtime video clips. UMTS will integrate state-of-the-art telecommunication technologies.
  • Depending on the UMTS network structure and its services, different kinds of UEs will be available: - single-mode FDD - single-mode TDD - dual-mode FDD / TDD - dual-mode FDD / another radio system (e.g. GSM) - dual-mode TDD / another radio system- tri-mode FDD/TDD/GSM

Ch3 umts network Ch3 umts network Presentation Transcript

  • UMTS NETWORK ARCHITECTURE RAN CN Radio Access Network Core Network GSM BSS CS Domain Entities common External to the CS & PS Domain NetworksUE UTRAN PS Domain
  • UMTS NETWORK ARCHITECTURE GSM BSS CS Domain T MSC / PSTN BTS B R GMSC A IWF/ VLR S ISDN U TC BTS C EIR HLR AUC UTRAN Node B R X.25 (n x BTS)UE N Node B C SGSN GGSN IP (n x BTS) PS R Domain Node B (n x BTS) N C
  • UMTS NETWORK ARCHITECTURE
  • 1-Core Network Domain Circuit Switching DomainMSC Function  switching and call routing to or from MS.  Charging.  Control of connected RNC’s.  One MSC controls more than one RNC.GMSC Function  Access to PSTN.  Provides the gateway functionality/Interface to other networks.
  • 1-Core Network Domain Circuit Switching DomainVLR Function  Associated with MSC  Subscriber Management in MSC area.  Authentication co-ordination.VLR Data. A temp data base that holding the following information  Services available and restrictions.  Temp subscriber information. TMSI; LAI; triples….etc. MSC/VLR The VLR hold these data for the subscriber included in the MSC area only.
  • 1-Core Network Domain Circuit Switching DomainSupercharger • Large database • Periodic Auditing • Dynamic subscription data deletation
  • 1-Core Network Domain Circuit Switching Domain B T R A VLR S A TC U B C Transcoding E & RAN IWF/ MSC Radio Access IWF Network TC CInterWorking Function Iu(CS) Gs F R N C BlaBla BlaBla Bla TC Bla Transcoding • CN function in UMTS: 4.75 – 12.2 kbit/s part of MSC or standalone 64 kbit/s (ISDN) AMR: Adaptive MultiRate • Conversion of Speech Data (CN  RAN): using AMR speech codec UTRAN • CN: 64 kbit/s CN • RAN: 4.75 – 12.2 kbit/s (AMR)
  • 1-Core Network Domain Circuit Switching Domain B T TC R A VLR S A Transcoding U B C & E IWF RAN IWF/ MSC Radio AccessInterWorking Function Network Iu(CS) TC Gs F C R N C • Interworking: TDM  ATM • all „classical“ CN-Interfaces (A-G): IWF TDM based (E1/T1  PCM30/PCM24) • Iu(CS): ATM based
  • 1-Core Network Domain Circuit Switching DomainATM “Asynchronous Transfer Mode”• cell-based switching technique if small: high header-to-data overhead if large: low utilization for small messages• ATM exposes properties from both circuit switched and small packet switchednetworking• ATM is a core protocol used over the SONET/SDH backbone• ATM uses a connection-oriented model and establishes a virtual circuit betweentwo endpoints before the actual data exchange begins• Special switches and routers which is faster can be used as we use fixed length 5 48 Cell = 53 Byte
  • 1-Core Network Domain Register and Service domainHLR FunctionThe HLR is a centralized (unique) network database that storesand manages all mobile subscriptions.  IMSI, MSISDN  Services subscribed  Service restrictions (e.g. roaming restrictions)  Parameters for additional services  Authentication data Temporary information  Current MSC/VLR address  MSRN (if user outside PLMN)
  • 1-Core Network Domain Register and Service domain2G AUC - It is a processor system that performs the authentication function AUC IMSI Ki Database RAND IMSI,Ki Request for Triplet from HLR,VLR A3 A8 Triplet RAND SRES Kc Triplet
  • 1-Core Network Domain Register and Service domainMS HLR/AUC IMSIKi RAND Ki A3 A3 SRES SRES VLR SRES =? Continue Yes ciphering “Authentication Refused" No message
  • 1-Core Network Domain Register and Service domainAuthentication Center AUCA Key of 128 bit is used K One way Function X RAND For a try to take 1usec it needs 10790283070806014188970529.15499 year to get K
  • Authentication Vector AV • consisting of 3 parts Used for user Used for data Used for • Used for network randomly generated, authentication i.e. non-predictable authentication encryption integrity check RAND XRES CK IK AUTN Random Number Expected Response Cipher Key Integrity Key Authentication Token 128 bit F2 F4 F3 F1+F5 USIM VLR / SGSN Authentication Request generate RES(i) = [RAND(i), AUTN(i)] f2(RAND(i),K) Authentication Response User Authentication: AUTN(i) for [RES(i)] Compare Network Authentication XRES(i) & RES(i)
  • Data Integrity Check Basic Principleprovides security against:• unauthorised modification of control data• change of data origin Transmitter Receiver Data check sum Data Control Datacheck sum check sum IK dependent Generator IK check sum generator IK F9 F9 Equal? check sum check sum
  • 1-Core Network Domain Register and Service domainUSSD “Unstructured Supplementary Service Data” Gateway •USSD is generally associated with real-time or instant messaging type phone services. •SMSC is not present in the processing path). A USSD Gateway routes USSD messages from the signaling network to service applications and back
  • Media GatewayMedia gateway server.  This translates media traffic between different types of network.
  • 1-Core Network Domain Packet switching domainSGSN Function  Provides packet routing and transfer to and from the SGSN service area.  Ciphering and authentication  Mobility management  Output of billing data. SGSN
  • 1-Core Network Domain Packet switching domainGGSN Function  The interface towards the external IP packet networks.  Acts as a router  Address mapping  Tunneling  Output of billing data.
  • 2. Access Network Domain
  • 2-Acess Network RNC functionFunction of the RNC. Channel request and assignment Code allocation Handover decision & type Power control (outer loop). Ciphering/deciphering. Admission (access) control. Node-B control
  • 2-Acess Network Node B functionFunction of the Node B. Contains the RF equipment Codes generation. spreading/dispreading channel coding power control (inner loop). Signal measurements Mapping of Transport channels intophysical channels Modulation and De-modulation
  • 2-Acess NetworkNode B function
  • 2-Acess Network Node B functionQuite widely referred to as the driver receiver (DRX). Basically does transmissionand reception of signalsAmplifies the signal from DRX for transmission through antenna; may be integratedwith DRX.Combines feeds from several DRXs so that they could be sent out through a singleantenna.For separating sending and receiving signals to/from antenna.This is also considered a part of the BTS.Collects working status alarms of various units in the BTS and extends them to(O&M)Frequency hopping, signal DSP, etc..
  • 2-Acess Network Node B function Cell’s Types Pico Cell Micro & Macro Repeater Cells CellsIndoor Street Level Outdoor Indoor Roof Top COW Green Field Stup tower Poles Tower Monopole
  • 2-Acess Network Node B function Outdoor repeater:
  • 2-Acess Network Node B function Indoor repeater:
  • 2-Acess Network Node B function Green filed: Equipment Equipment Antennas Antennas
  • 2-Acess Network Node B function• Roof top: Antennas
  • 2-Acess Network Node B function• COW (Cell on Wheels):Used as a temporary solution to provideCoverage or Capacity for certain duration(Events).
  • 2-Acess Network Node B function• Street level:
  • 2-Acess Network Node B function• Indoor:
  • 3- User Equipment domainFunction of the User Equipment domain .The end user node; that provide the services/application to the users.The new generation of UMTS phones will combine the advantages ofwireless communication with the demand for multimedia applicationsConsists of. User Terminal. UMTS Subscriber Identity Module (USIM) UE
  • 3- User Equipment domain User TerminalMultimode user equipment
  • 3- User Equipment domain User TerminalUSIM function.Stores user addresses IMSI,TIMSI, rooming, etcAuthentication and encryption features subscriber’s secret authentication key (Ki and K) Security Algorithm & Keys (for Authentication, Ciphering,..).Personalization SIM stores user profile (subscribed services) SMS, short numbers, etc  Protection codes PIN ,PUK
  • Vodafone Coverage
  • Mobinil 3G Coverage