Berikut proses yang terjadi jika lo melakukan telepon dan SMS dengan hape/smartphone

Broadcast Channel (BCH)

• FCCH (Frequency Correction Channel) → Memberitahukan frekuensi dari BCCH

• SCH (sync Channel) → Sinkronisasi time slot

• BCCH (Broadcast Control Channel) → Untuk informasi CGI (MSS, MNC, CI, LAC) dan informasi tambahan lainnya.

Common Control Channel (CCCH)

• PCH (Paging Channel) → Memberitahu pada MS bila ada panggilan → Downlink

• RACH (Random Access Channel) → Meminta resource pada BSS (request SDCCH) → Uplink

• AGCH (Access Granted Channel) → Jawaban BTS atas request akses SDCCH/ Utilization permission → Downlink

Dedicated Control Channel (DCCH)

• SDCCH (Stand alone Dedicated Channel) → Call set up signaling (negotiation), SMS, location update, etc.

• SACCH /TCH (Slow Associate Control Channel) → MS Power, TA, Power control, SMS (busy).

• FACCH /TCH (Fast Associate Control Channel) → Handover, MS Shutdown.

 

Proses ketika MS ON :

1. FCCH → req BCCH → menyamakan Frequency
2. SCH → Sync Time Slot
3. BCCH
4. SDCCH → Location Update

Proses melakukan panggilan :

1. RACH → Request SDCCH
2. AGCH → Izin akses dari BTS
3. SDCCH → Dapat dilakukan panggilan

Proses menerima panggilan :

1. PCH
2. RACH
3. AGCH
4. SDCCH
5. TCH

Proses memutuskan panggilan :

FACCH

Sekian penjelasan singkatnya 😀 😛

Credit : thanks to www.radio-electronics.com