, gsm :
GSM, ( )
GSM, , GSM ( )
(. " D900/D1800", " ", " GSM").
GSM
GSM GSM (MSISDN IMSI), PLMN, GSM.
- PLMN GSM. GSM .
PLMN GSM (NDC). MSISDN NDC " D900/D1800", " ", " GSM".
.
(NDC) PLMN HLR/AC MSISDN NDC. , PLMN PLMN PLMN , , GSM , , , PLMN.
( GSM MSC)
GSM PLMN GSM NDC, . MSC () GSM , .
(LAC)
( GSM-RITL CSC)
, LAC, , , LAC, , .
CSC () , .
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IMSI SSS BSS
IMSI SSS
IMSI MSC , (SSS), . (OS).
IMSI:
IMSI
MSC OS FTAM ( .25)
IMSI
OS MSC CMISE ( .25) (. 3.1.16, , )
(. " SSS", 2, " ", " IMSI").
BSS
BSS BSS . , BSS (, BSC, BTS), , IMSI SSS, (IMSI). ( IMSI SSS BSS) OMC-S.
BSS SSS BSS.
IMSI Q3/MML OMC-S. - BSS OMC- FTAM (.25).
IMSI SSS BSS :