an intro to gsm

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    D(3),(22) (4) (5) (6) (7)

    (8) (9) (10) (11) (12) (14)

    (15) (16) (18) (19) (20)

    (23) (26) (27) (28)

    (30) (31) (32) (33) (35)

    (36) (37) (39) (40) (41) (42)

    (43) (44) (45) (46) (47)

    (48) (49)

    (29)

    (21)

    (2)

    R

    (1)

    (3)

    (22)

    (38)

    (34)

    (13)

    (17)

    (24) (25)

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    call blockedS(1) is full ?

    S(1) is full ?S(2) is full ?

    S(2) is full ?

    N(2) is full?

    N(2) is full?

    assign a CH from N(1)

    assign a CH from S(2)

    inner-cell _(2)using S(2) CH?

    inner-cell _(2)using S(2) CH?

    call blocked

    inner-cell_(2) gets a CH

    from N(2) and gives upa CH of S(2)

    inner-cell_(2) gets a CHfrom N(2) and gives up

    a CH of S(2)

    inner-cell_(1) gets theS(2) CH and gives up

    a CH of N(1)

    assign the N(1) CH

    inner-cell_(1) gets a CHfrom S(2) and gives up

    a CH of N(1)

    assign the N(1) CH

    call blocked

    call blocked

    no

    call initiationin Cell_(1)

    assign a CH from S(1)

    yes

    no

    yes

    no

    no

    no

    yes

    no

    yes

    no

    yes

    no

    yes no

    N(1) is full?

    yes

    inner-celluser?

    yes

    yes

    inner-cell _(1)using N(1) CH?

    no

    yes

    assign the S(2) CH

    inner-cell_(1) gets a CHfrom S(1) and gives up

    a CH of N(1)

    assign the N(1) CHno

    yes

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    1 1A = x + y 1 A = x + y2 2 2

    x2

    x1 y1 y2

    1u u

    2

    C=N+S

    N

    S

    v

    C=N+S

    N

    S

    v1 2

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    20 22 24 26 28 30 32 34

    103

    102

    101

    100

    CallBlockingProbabilities

    Traffic Density A

    FCA

    X: HCA [5]

    NCCS

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    15 16 17 18 19 20 21 22 23 24

    106

    105

    104

    103

    10

    2

    101

    100

    CallBlockingProbabilities

    Traffic Density A

    FCA

    CBWL/CR [8]

    NCCS

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    20 21 22 23 24 25 26 27 28 29 30

    108

    107

    106

    105

    104

    103

    102

    101

    100

    CallBlockingProbabilit

    y

    Traffic Density A

    : FCA

    m=2

    m=3

    m=4

    m=5

    m=6

    m=7

    : NCCS