EIR (EQUIPMENT IDENTITY REGISTER) EIR EIR INTERNATIONAL MOBILE
EQUIPMENT IDENTITY IMEI SERIAL NUMBER IMEI EIR SIM EIR 3 (WHITE
LIST), (GREY LIST) (BLECK LIST) IMEI 1.4 Operation and Maintenance
Center (OMC) OMC OMC-S (OMC Switch) MSC HLR OMC-R (OMC Radio) BSC
BTS2. GSM GSM 50MHz 890-915 MHz 935-960 MHz MS 25 MHz GSM 124 200
KHz Frequency Division Multiple Access(FDMA) 8 Time Division
Multiple Access (TDMA) GSM FDMA TDMA
6.2
GSM GSM (RPE-LTP encoder) (Channel coding ) GMSK (Gaussian
Minimum Shift Keying) Mobile switching center MSC
GSM 200 kHz GSM 270.833 kbps (frame) 1 4.62 ms 8 (time slot) 577
us 26 (multi-frame) 120 ms 1 24 2 12 25 12 SACCH 25 ldle/SACCH
The tail bits tail bit 3 0 The encrypted bits 57 2 Stealing flag
1 2 FACCH Stealing flag data bit The training sequence 26 The guard
bits 2 2 guard bits 8.25 30 us