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B-2
Glossary
ARFCN Absolute Radio Frequency Channel Number
BCH The BCH (Broadcast Channel) is a beacon which is always
turned on so that mobile can look out for it when trying to find
service. A useful BCH always carries information in timeslot 0.
The BCH ARFCN has to be active in all timeslots to allow
mobiles to synchronize to other cells. There are a number of
other areas to the BCH:
• TCH (Frequency correction Channel) is a special burst on the
BCH. It has special fixed bit sequences to allow the mobile to
tune onto the midamble.
• SCH (Synchronization Channel) has a burst with extended
midamble. It is used by the mobile to adjust its internal timing
and get synchronized to the multiframe sequence.
• BCCH (Broadcast Control Channel) has information encoded
on it which identifies the network. It also carries lists of the
channels in use in the cell (BA and CA tables).
• CCCH (Common Control Channel) is like a message board.
Like the FCH, SCH, and BCCH, it can be received by any
mobile. Sub-channels like PCH (Paging Channel) and AGCH
(Access Grant Channel) are posted on the CCCH.
BCCH Broadcast Control Channel. A unidirectional channel used by
the base station facilities to broadcast control information to
land mobile units.
Bit Error Rate The digital receiver test that measures of the quality of the
recovered information (sensitivity and usable input level range)
equivalent to SINAD in an analog system.
BS Base Station
BTS Base Transceiver System