04 - ΣΔΥ50 - ΟΣΣ5 -...

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ΣΔΥ50 - ΟΣΣ5

Transcript of 04 - ΣΔΥ50 - ΟΣΣ5 -...

  • 5

  • #1

    E

    F

    2

    C

    D

  • #1

    :

    1. 2. 3. 3.

    4. A C

    B E5. A D

    B E

    3

  • #1 -

    :

    :

    ,

    4

  • #1 -

    :1.

    ()

    2. 2.

    3.

    4. A C B E () C

    5. A D B EO D , ()

    5

  • #2 802.11 .

    ( ) , , .

    (collision windows) CWmin=32 CWmax=1024,

    ;

    1 ; 6

  • #2 -

    H ( slot RTS ) [0, 31]

    20

    , (=64).

    , [0, 63]

    34

    7

  • #2 -

    : P1=1/32

    : P2 = (1/32)

    .(1/64)

    8

    DATA ACKSI

    F

    S

    D

    I

    F

    S

    (backoff)

    RTS

    RTS

    I

    F

    S

    I

    F

    S

    RTS CTS

    S

    I

    F

    S

    S

    I

    F

    S

    DATARTS

    RTS

    I

    F

    S

    I

    F

    S

  • #3

    scatternets;

    scatternets. ; ;

    9

    a

    b

    e

    d

    c

    fP1

    P2 a

    b

    e

    d

    c

    fP3

    : master, : bridge, : slave

  • #3 -

    scatternets:

    scatternet

    (control data)

    (hops) ( ( )

    ( master bridge slave)

    piconets ( )

    ( )

    10

  • #3 -

    :

    ( - frequency hop patterns)

    P1 P2

    a

    b

    e

    d

    c

    fP1

    P2

    P1 P2

    f c c

    :

    , ( piconets, hops, , master 2 masters & 1 bridge) 11

    a

    b

    e

    d

    c

    fP3

  • #4 --

    adhoc ( S D DSR

    B

    S EF

    Z

    Y

    12

    B

    AH

    J

    D

    C

    G

    IK

    RREQ S D

    ()

    M

    N

    L

  • #4

    DSR :

    RREQ

    , , RREQ

    DSR

    13

  • #4 -

    B

    S EF

    C

    Z

    Y (broadcast)

    M L

    [S]

    14

    AH

    J

    D

    C

    G

    IK

    RREQ

    M

    N

    L

    [X,Y] RREQ

  • #4 -

    B

    S EF

    C

    Z

    Y

    M L

    [S,E]

    [S,B]

    15

    AH

    J

    D

    C

    G

    IK

    H RREQ :

    M

    N

    L

    [S,C]

  • #4 -

    B

    S EF

    C

    Z

    Y

    M L[S,E,F]

    [S,B,A]

    16

    AH

    J

    D

    C

    G

    IK

    C RREQ G H, ,

    M

    N

    L

    [S,C,G]

    [S,B,A]

    [S,B,H]

  • #4 -

    B

    S EF

    C

    Z

    Y

    M L[S,E,F,J]

    17

    AH

    J

    D

    C

    G

    IK

    M

    J K RREQ D D

    N

    L

    [S,C,G,K]

    [S,B,H,I]

  • #4 -

    B

    S EF

    C

    Z

    Y

    M L

    [S,E,F,J,M]

    18

    AH

    J

    D

    C

    G

    IK

    D RREQ

    M

    N

    L

  • #4 -

    B

    S EF

    C

    Z

    Y

    M L

    RREP [S,E,F,J,D]

    19

    AH

    J

    D

    C

    G

    IK

    M

    N

    L

    RREP

  • #4 -

    RREQ : - RREQ

    (flooding) ( slide 18).

    TTL RREQ

    (loops), RREQ : N sequence number (SN) ,

    RREQ SN

    . 20

  • & DSR

    DSR , RREP [S,E,F,J,D] F [F,J,D] D [F,E,S] S

    F D,

    : (caches)

    21

  • #5

    / / -

    22

  • #5 -

    (hardware)

    (modulation)

    MAC (.. ZigBee, S-MAC)

    (energy-aware routing)(energy-aware routing)

    .. )

    (multi-hop)

    (processing/filtering)

    () - (spatial-temporal redundancy)

    23

  • #6

    (supermarket) tablet PCs RFID .

    , , RFID (tag).

    4 supermarket ( ) .

  • #6 -

    ( / )

    ( ( check-out)

    , (.. , ) , .

    25

  • #6 -

    /marketing .

    ( ( ), stock .

    26

  • #7

    .

    ;

    ;

    27

  • #7 -

    /

    ,

    .. ..

    28

  • #7 -

    /

    (.. , ) (alert) . (alert) .

    /

    (, ;)

    .

    security / .

  • #7 -

    (.. )

    GPS

    GSM/3G SIM .

    (

    .

    30

  • #8 -

    .

    .

  • #8

    ;

    - Online banking

    - Flash-based tetris high scores

    - Web

    - Car navigator online traffic data

    - (standalone)

  • #8 1:

    (distributed presentation architecture)

    thin client (. . 56 Coulouris et al).Coulouris et al).

    , .

    : -11 Window System Unix , Remote Desktop Protocol Microsoft

    33

  • #8 2:

    (remote presentation architecture)

    thin client thin client

    : on-line transaction , Web Web browsers

    34

  • #8 3:

    (distributed function architecture)

    (application logic) . (.. )

    : Java applets

    35

  • #8 4:

    (remote data architecture)

    O fat-client

    PC

    ..

    : (DB2, Oracle,

    Informix, ..) client/server

    .

    (Decision Support System)

    ,

    .36

  • #8 5:

    (distributed data architecture)

    fat-client (cache)

    : : (.. NFS)

    37

  • #8

    Online banking

    Flash-based tetris

    high scores

    Web

    Car navigator

    online traffic data

    (standalone)

    38

  • #9 3

    (instructions) (3J) 1Kbit 100m. () 100 Kbyte 100m , 60 60 10.000 1Kbit .

    , ;

    , .

    .39

  • #9

    ( ) ; ( ). ( ).

    40

  • #9 -

    :

    (60,000/3) x 3 = 60,000 J

    , (100 x 8) x 3 = 2400 J 10,000 x 3 = 30,000 J 10,000 x 3 = 30,000 J . , 32,400 J

    , .

    41

  • #9 -

    ( ) (responsiveness) .

    (. ) ( ) .

    42

  • #9 -

    URL .

    .

    43

  • #10

    10 KHz . 4 bits , :

    () ; ;

    () (S/R ratio) ; .

    44

  • #10 -

    () R Nyquist: R=2Wlog2, M .

    4 bits, log2=4, R=2*10*4=80 Kbps.2

    () Shannon, C C=Wlog2(1+S/N). C=R=Wlog2(1+S/N) => log2(1+S/N)=R/W=8 =>1+S/N=256 => S/N=255 (24,06 dB).

    45