2
(BSS)
1. :
- ;
- , ;
- ;
- ;
- GSM.
2. .
[1, 2, 3]. .
, , . . , , .
³ .
GSM
GSM
. 6.1 GSM , , x , :
- (. Base Station Subsystem - BSS);
- - (. Network and Switching Subsystem - NSS);
- pyxoi (. Mobile Station - MS);
- (. Operation and Maintenance Subsystem - OMS).
3 ' , . . GSM i , , .
GSM . , - , ( ). .
ֲ (. Base Transceiver Station - BTS) ' . ipo , (') . i , , . (, , ) .
ֲ (. Base Station Controller - BSC) 璺 , . (. handover) (. power control). 䒺 MS (. Mobile Switching Centre).
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, ( ) , ( ). . , -bis, MSC . , .
-
- GSM. MSC , , , (. mobility management) , . - , 䳿 .
- () (. 6.1).
ֲ ֲ ί - MSC (. Mobile Switching Centre) GSM, GSM . , , , ISDN, , . . MSC , .
6.1 GSM
, MSC 璺 MSC GSM, GMSC, . IWF (. InterWorking Funkctions). , , GSM, , . , , MSC , , : , , .. - GSM , . , , . , , GSM , . , . , , GSM. , HLR VLR.
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Ū ֲ - HLR (. Home Location Register). , GSM HLR. ( ), HLR . , , . MSC, . .
Ū ֲ - VLR (. Visitors Location Register) - , . VLR , , MSC. VLR, MSC, HLR, , . HLR VLR . VLR HLR. 璺 -, VLR , , HLR.
GSM - MSC, , GMSC.
ֲ ֲ - GMSC (. Gateway Mobile Switching Centre) GSM . , , 璺 GMSC. , - IWF. GMSC 璺 GSM. HLR MSC , . GMSC 璺 , MSC. 璺 MSC, VLR , 璺 .
Բֲ - uC (. Authentication Centre)- , 䳺 HLR , . 璺 , . AuC , , , .
Ū Բֲ - EIR (. Equipment Identity Register) - , . , GSM , , , . . EIR 璺 MSC . , MSC (., , ) .
MS (. Mobile Station) GSM. , , . (. handheld), , (. portable), .