, , , , . GSM HLR BSS VLR (SCI). , SCI, VLR.
HLR, , VLR . , VLR GSM GSM "" VLR, , HLR.
(GCR)
(VGCS, VBS) (GCR): . GCR, MSC. GCR . VGCS, VBS .
( GSM, / ). , . , "" . 9 MSC ( MSC).
(LR)
LR GSM. LR VLR GSM, , VLR, , VLR. , LR (MTC), () MSC (GMSC).
.
:
(IMSI)
ISDN- (MSISDN)
HLR MTC. MTC , HLR () MSC (GMSC) GSM (MSRN) VLR. HLR MSRN GMSC. CFNR VLR , GSM ( ), HLR GMSC.
" (CFU)" " (BAIC)", GSM , , VLR HLR . HLR , , GMSC.