:
SSS (MSC/VLR, HLR/AC, EIR)
BSS (TRAU, BSC, BTS)
( ) .
SSS
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(. " SSS", 1, " ", " ").
BSS
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, MSC,
, MS,
BSS BSC .
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MSC
PLMN
( )
, (, ).
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, . PLMN.