02 - ΣΔΥ50 - ΟΣΣ5 - AdHoc Networks.pdf

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    &

    5

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    2

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    ()

    .., GSM, GPRS, 3G, WiFi (BS)

    BS

    BS

    BS

    3

    IP

    Server Router

    Gateways

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    ;

    ; ..

    ; ..

    ,

    ; ..

    4

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    adhoc

    adhoc

    : ,, ..

    parking ( ) (, , PDA,

    , ) 5

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    : () ,

    : aptops

    6

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    A H , (Mobile ad hoc networks,

    MANETs)

    (Wireless sensornetworks, WSNs)

    7

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    /

    :

    (.. )

    ( )

    ( ): BS

    ,

    ( ) 8

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    ,

    ,,

    : / (

    9

    ?

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    :

    ( !) ad hoc ,

    MANETs:

    10

    H ( )

    ..

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    :

    : :

    , ..

    multiho

    :

    11

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    12

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    (WPAN)

    :

    /

    Adhoc

    Laptops, desktops,

    13

    Personal AdPersonal Ad--

    hochocConnectivityConnectivity

    ReplacementReplacement

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    (ISM) 2.4 GHz

    720Kb/s

    FHSS, (2.402 2.480 GHz > 79)

    master

    8 piconet (1master 7 slaves)

    piconets scatternets

    14

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    ;

    ad hoc

    master slaves piconet.

    M

    SS

    S

    SB

    P

    (hopping pattern).

    piconet

    hopping pattern/ID master

    7 200+

    (parked) slaves piconet 15

    P

    M=Master

    S=Slave

    P=Parked

    SB=Standby

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    S; Scatternet

    piconets

    master slave.

    M

    SS

    S

    SB

    P

    P

    .

    radios ( radio master slave)

    , piconet () 720 Kbps

    16

    M

    S

    P

    SB

    M=Master

    S=Slave

    P=Parked

    SB=Standby

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    17

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    ; ,

    (flooding) (control overhead)

    18

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    ()

    (tabledriven)

    ()

    (OnDemand)

    /

    !

    19

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    D S

    R (DSR)Ondemand

    ,

    20

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    DSR

    A ROUTE REQUEST (RREQ) (local broadcast)

    21

    A B C DE

    []

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    DSR

    , ROUTE REPLY(RREP) . RREP

    . ,

    22

    A B C DE

    [, ]

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    23

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    ( S N, SN), (selforganized, adhoc)

    (sensors)

    WSN (sink)

    , WSN , , .. , , wireless mesh networks,

    ( ) 24

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    SN;

    : ,

    25

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    (sensor field)

    (sink)

    26

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    SN

    Sink

    27

    (sink).

    .

    ;

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    , ,

    /,

    ,

    , /,

    ,

    ,

    , , , ,

    , 28

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    ( )

    Location finding system Mobilizer

    ProcessingunitSensing unit

    29

    Processor

    StorageSensor ADC

    Transceiver

    Power unit Powergenerator

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    WeC 99Smart Rock

    Mica 1/02

    Rene 11/00

    Telos 4/04RobustLow Power250kbpsEasy to use

    30

    Small microcontroller8 kB code512 B data

    Simple, low-power radio

    10 kbps ASKEEPROM (32 KB)

    Simple sensors

    NEST open exp. Platform

    128 kB code, 4 kB data40kbps OOK/ASK radio512 kB Flash

    Designed forexperimentation

    -sensor boards-power boards

    Dot 9/01

    Demonstratescale

    Spec 6/03Mote ona chip

    Mica2 12/0238.4kbps radioFSK

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    SN

    ,

    (disconnections)

    :

    (sink)

    (latency) sink

    31

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    SN (Fault Tolerance)

    To

    (Scalability)

    / (.. )

    (Hardware Constrains)

    / < 1 $ ;;

    32

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    SN (Sensor Network Topology)

    (predeployment),

    (deployment) (postdeployment)

    (Environment)

    , , , ,

    33

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    SN (Transmission Media)

    (.. radio, infrared, opticalmedia)

    (Power Consumption)

    :

    (sensing)

    ( )

    34

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    SN

    WSN

    : (sensors)

    :

    , (sink)

    ()

    35

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    36

    (PA): Route 2(ME) : Route 1

    (MH):Route 3 PA: Route 3

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    MAC : SMAC :

    ,

    Tradeoff:

    37

    SYNC ( SYNC ) RTS

    CSMA/CA

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    MAC : B

    To SMAC ( )

    ZigBee ( 802.15.4) :

    (FFD)

    (RFD) RFD

    FFD

    38

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    MAC : B

    ZigBee , beacon ( FFD)

    beacon

    ()

    :

    beacon

    ( CSMA/CA)

    : timeslots

    . 39