- Downlink Only.
- Broadcast information of the serving cell (System Information).
- Transmitted on timeslot zero of BCCH carrier.
- Read only by idle mobile at least once every 30 secs.
- Downlink Only
- Carries information for frame synchronization.
- Contains frame number and BSIC (Base Station Identity Code).
- Downlink Only.
- Enable MS to synchronize to the frequency.