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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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