Broadcast Channels (BCH)
- Frequency correction channel (FCCH)
- the “lighthouse” of a BTS
- Synchronization channel (SCH)
- PLMN/base identifier of a BTS plus
- synchronization information (frame number)
- Broadcast control channel (BCCH)
- to transmit system information 1-4, 7-8 (differs in
- GSM 900, GSM 1800, and PCS 1900)
CBCH and CCCH
- CBCH (Cell Broadcast Channel)
- transmits cell broadcast messages
- PCH (Paging Channel)
- carries PAG_REQ message
- AGCH (Access Grant Channel)
- SDCCH channel assignment
- RACH (Random Access Channel)
- communication request from MS to BTS