. 3.5 MS .
. 3.5. MS
MSC/VLR , LA MS. BSC, LA.
1. BSC LA. , PCH.
2. MS PCH, RACH.
3. BSC AGCH MS , SDCCH SACCH .
4. SDCCH SACCH . , SDCCH .
5. MS BTS TCH . , . , MS SACCH.
4 - GPRS
GPRS GSM . GPRS GSM. , . GPRS , .
GPRS , GSM , GPRS . . , GPRS .
GPRS
GPRS. GPRS GSM, GSM . GPRS , GPRS .
GPRS GSM, BSC, (. . 4.1). GSM : GPRS Serving GPRS Support Node (SGSN) GPRS Gateway GPRS Support Node (GGSN). . GPRS, , , GPRS, SGSN GGSN. SGSN GGSN.
, GPRS GSM GPRS .
. 4.1 GPRS ( BSS, CSS PSS)
SSGN BSC Gb, ETSI. .