Overlaid Cells Concepts

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    (a) (b)macrocellmicrocell

    microcell

    MSC

    BS:macrocell

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    .. .. .. .. .. .. ..

    4

    1

    2

    3

    TIER

    TIER # 4

    (a) U: Upper Tier L: Lower Tier

    TIER # 3

    MacroLayer

    MicroLayer .. .. .. .. .. .. ..

    TIER

    U

    L

    LEVEL # 3

    LEVEL # 2

    LEVEL # 1

    (b): handoff direction

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    r

    d

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