Curs_9 comunicatii mobile

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  • Sisteme de Comunicatii

    Mobile (SCMB)

    - curs 9 -

  • Continutul prezentarii

    EDGE Principii

    Scheme de codare

    Parametri QoS

    Introducere in 3G Familia IMT 2000

    Servicii

    WCDMA

  • Evolutia 2G > 3G

    2+ = GSM Phase 2+

    HSCSD = High Speed Circuit Switched

    Data

    GPRS = General Packet Radio System

    EDGE = Enhanced Data for GSM

    Evolution

    UMTS = Universal Mobile

    Telecommunication System

  • EDGE - caracteristici

    Modificarea interfetei radio pastrand TDMA

    Se introduce modulatia 8-PSK (3 bit/simbol)

    Se combina cu operarea multislot

    Variante de EDGE: E-GPRS

    E-CSD

    Debit maxim teoretic: 384 Kbps Debit mediu: 100 Kbps / User

  • EDGE scheme de codare

    MCS Modulation Code rate User Rate/TS

    1 GMSK .53 8.8 kbps

    2 GMSK .66 11.2 kbps

    3 GMSK .80 14.8 kbps

    4 GMSK 1 17.6 kbps

    5 8PSK .37 22.4 kbps

    6 8PSK .49 29.6 kbps

    7 8PSK .76 44.8 kbps

    8 8PSK .92 54.4 kbps

    9 8PSK 1 59.2 kbps

  • EDGE performante (1)

    Debit in functie de raportul semnal / zgomot

    0 5 10 15 20 25 30 35 40 45 0

    10

    20

    30

    40

    50

    60

    SNR [dB]

    thro

    ug

    hpu

    t p

    er

    tim

    eslo

    t [k

    bp

    s]

  • EDGE performante (2)

  • Parametri QoS

    DOCUMENTTYPE 1 (1)

    TypeUnitOrDepartmentHereTypeYourNameHere TypeDateHere

    Traffic class ConversationalRT

    - guaranteedcapacity- no ARQ

    StreamingRT

    - guaranteedcapacity - ARQ (MAClevel) - Add. Buffering inapplication

    InteractiveNRT

    -best effort- ARQ- interactiveWWW, Telnet,- RT controlchannel

    BackgroundNRT

    -best effort- ARQ- backgrounddownload ofemails,calendarevents, etc.

    Delay 100ms, 200ms,400ms

    < 1 s 2 s N/A

    BER 10-3, 10

    -4, 10

    -5 10

    -5, 10

    -6, 10

    -7, 10

    -

    8 < 10

    -9 < 10

    -9

    Max bitrate Guaranteed Guaranteed bitrate isguaranteed, notthe maximum

    Notguaranteed

    Notguaranteed

    Serviceprecedence

    High, medium, low High, medium,low

    High, medium,low

    High, medium,low

  • 3G Origini, motivatie

    Previziuni 2015: 3 miliarde abonati mobili, venituri estimate la 350 miliarde $

    Motivatie: creste utilizarea serviciilor mobile de date

    Problema: incompatibilitatea sistemelor 2G: PDC (Personal Digital Cellular), PHS (Personal

    Handyphone System) Japonia

    AMPS (Advanced Mobile Phone Service), IS-136 (D-AMPS), IS-95 (cdmaOne) America, Asia

    GSM (Global System for Mobile Communications) Europa, Asia, America

  • IMT 2000

    Necesitati: un standard unic

    Problema: interesele economice diverse!

    ITU (International Telecommunication Union) propune

    familia de standarde IMT 2000 (International Mobile

    Telecommunications) - un membru al familiei:

    Ofera roaming altor membri

    Serviciile respecta niste capabilitati standard

  • Capabilitati IMT 2000

    Acces wireless mobil si fix prin retele diverse la debite 144K, 384K, 2M

    Roaming global

    Interoperare cu 2G

    Operare in mod pachet sau circuit

    Negocierea QoS

    VHE (Virtual Home Environment) portabilitate servicii/preferinte peste retele/terminale diverse

  • Interfete IMT 2000

    UIM (User Identity Module) MT

    MT RAN (Radio Access Network), bazata pe WCDMA, TDD/FDD

    RAN CN (Core Network)

    NNI (Network to Network Interface), intre diferite CN

  • Sisteme 3G

    Tendinta 1, 3GPP (3rd Generation Partnership

    Project), GSM -> UMTS

    Tendinta 2, 3GPP2, IS-95 -> Cdma 2000

    Benzi rezervate IMT 2000:

    1885-2025 MHz, 2110-2200 MHz

    806-960 MHz, 1710-1885 MHz, 2500-2690 MHz

  • Servicii 3G - domenii

  • UMTS - Acoperire

  • UMTS Retea acces si nucleu

    CORE

    (IP, ATM, SDH, DWDM, etc.)

    BRAN

    (Broadband

    Radio Access

    Network)

    SRAN

    (Satellite

    Radio Access

    Network)

    UTRAN

    (Univ. Terrestrial

    Radio Access

    Network)

    802.11 WCDMA

  • Arhitectura UMTS coexistenta cu

    2G

  • UMTS Release 2000 EDGE/IPT Mobile

    NEW !

    WCDMA/IPT

    Mobile

    EDGE (GSM) BSS

    BS

    BS

    BS

    BS

    BSC

    BSC

    Abis

    WCDMA UTRAN

    BS

    BS

    BS

    BS

    RNC

    RNC Iur

    Iub

    GGSN

    SCP HLR

    3G-SGSN Iu

    CSCF MGCF

    SGW

    MGW

    PSTN/ ISDN

    Internet

    Multimedia Service Control (IPTelephony)

    Packet Core (GPRS) with real time services

    NEW ! NEW !

    IP transport option for SS7

    GMSC MSC/VLR

    Circuit Core

  • Arhitectura UMTS

    Server

    Server

    ETC ETC

    ETC ETC

    GSW

    GSW

    GSW

    GSW

    ETC

    ETC

    ETC ETC

    CLA

    ETC ETC

    PDE

    DX 200

    ETC ETC

    ETC ETC

    GSW

    GSW

    GSW

    GSW

    ETC

    ETC

    ETC ETC

    CLA

    ETC ETC

    PDE

    DX 200

    PSTN/N-ISDN

    Data Network (Internet)

    SS7 Network

    Inter-PLMN Backbone Network

    Inter-PLMN Backbone Network

    Node B

    RNC

    Iur Iu MAP

    Iu

    3G-GGSN

    3G-SGSN

    Gn

    IP Gp Firewall

    Border Gateway Gn

    3G-MSC

    CS Domain

    PS Domain

    EIR

    HLR/AuC

    LAN

    LAN

    Firewall

    Router

    Router

    Corporate 2

    Corporate 1

    Iub

    Gi

  • UTRA - Reteaua de acces radio

    terestra 3G

  • UTRA alocare spectru

    1980 2010 2025 2110 2170 2200 MHz

    1900

    TDD

    UL/DL

    TDD

    UL/DL

    1920

    FDD / UL

    W-CDMA MSS

    UL

    FDD / DL

    W-CDMA MSS

    DL

    MSS Mobile Satellite System

  • UTRA: FDD versus TDD

    time

    frequ

    ency

    Frequency division duplex (FDD)

    (Full duplex in analog systems)

    time

    frequ

    ency Time division duplex (TDD)

    (Half duplex in analog systems)

  • Caracteristici WCDMA

    FDD/TDD

  • UTRA FDD Technical summary Frequency band:1920 MHz -1980 MHz and 2110 MHz - 2170 MHz (Frequency Division Duplex) UL and DL

    Minimum frequency band required: ~ 2x5MHz Frequency re-use: 1 Carrier Spacing: 4.4MHz - 5.2 MHz Maximum number of (voice) channels on 2x5MHz: ~196 (spreading factor 256 UL, AMR 7.95kbps) / ~98 (spreading factor 128 UL, AMR 12.2kbps) Voice coding: AMR codecs (4.75 kHz - 12.2 kHz, GSM EFR=12.2 kHz) and SID (1.8 kHz) Channel coding: Convolutional coding, Turbo code for high rate data Duplexer needed (190MHz separation), Asymmetric connection supported Tx/Rx isolation: MS: 55dB, BS: 80dB Receiver: Rake Receiver sensitivity: Node B: -121dBm, Mobile -117dBm at BER of 10-3 Data type: Packet and circuit switch Modulation: QPSK Pulse shaping: Root raised cosine, roll-off = 0.22 Chip rate: 3.84 Mcps Channel raster: 200 kHz Maximum user data rate (Physical channel): ~ 2.3Mbps (spreading factor 4, parallel codes (3 DL / 6 UL), 1/2 rate coding), but interference limited. Maximum user data rate (Offered): 384 kbps (year 2002), higher rates ( ~ 2 Mbps) in the near future. HSPDA will offer data speeds up to 8-10 Mbps (and 20 Mbps for MIMO systems) Channel bit rate: 5.76Mbps Frame length: 10ms (38400 chips) Number of slots / frame: 15 Number of chips / slot: 2560 chips Handovers: Soft, Softer, (interfrequency: Hard) Power control period: Time slot = 1500 Hz rate Power control step size: 0.5, 1, 1.5 and 2 dB (Variable) Power control range: UL 80dB, DL 30dB Mobile peak power: Power class 1: +33 dBm (+1dB/-3dB) = 2W; class 2 +27 dBm, class 3 +24 dBm, class 4 +21 dBm Number of unique base station identification codes: 512 / frequency Physical layer spreading factors: 4 ... 256 UL, 4 ... 512 DL

  • UTRA TDD Technical Summary Frequency band:1900 MHz -1920 MHz and 2010 MHz - 2025 MHz (Time Division Duplex) Unpaired, channel spacing is 5 MHz and raster is 200 kHz. Tx and Rx are not separated in frequency, but by guard period. Minimum frequency band required: ~ 5MHz, ~ 1.6MHz with 1.28 Mcps Frequency re-use: 1 Voice coding: AMR (and GSM EFR) codec Channel coding: Convolutional coding, Turbo code for high rate data TDMA frame consist of 15 timeslots Each time slot can be transmit of receive Duplexer not needed Asymmetric connection supported Data by packet and circuit switch QPSK modulation Receiver: Joint Detection, (mobile: Rake) Chip rate: 3.84 Mcps or 1.28 Mcps Channel raster: 200 kHz Maximum RF ch bit rate (kbps): ~ 3.3Mbps (1/2 rate coding, spreading factor 1, 15 timeslots, ex overheads), but interference limited Frame length: 10ms Number of slots / frame: 15 Handovers: Hard Power control period: 100 Hz or 200 Hz UL, ~ 800 Hz DL Power control step size: 1, 2, 3 dB (Variable) Power control range: UL 65dB, DL 30dB Mobile peak power: Power class 1: +33 dBm (+1dB/-3dB) = 2W; class 2 +27 dBm, class 3 +24 dBm, class 4 +21 dBm Number of unique base station identification codes: 512/frequency Physical layer spreading factors: 1, 2, 4, 8, 16

  • CDMA, WCDMA

    Tehnica de acces multiplu (mai multe MS utilizeaza

    resurse radio in comun), cu multiplexare in cod

    W wide band, sugereaza largirea mai mare a benzii

    CDMA

    Un anumit numar de semnale CDMA s