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User Manual
Airbridge cBTS3612 CDMA Base Station
F-PICH (Forward Pilot Channel)
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Signals are transmitted on F-PICH all the time. The BTS will transmit a fixed signal
in the pilot channel. This signal serves to provide phase reference for the coherent
demodulation of MS receiver to ensure coherent detection, and facilites MS to
acquire synchronization signals from the synchronization channel and sector
identification information.
If the sector supports transmit diversity, it is necessary to configure F -TDPICH
(Forward Transmit Diversity Pilot Channel).
Smart antenna or beam shaping formation technology is adopted, the BTS will
provide one or more F-APICHs (Forward Assistant Pilot Channel) on the forward
channel to improve the system capacity and coverage.
When diversity transmit method is used in CDMA channel with F-APICH, BTS will
provide corresponding F-ATDPICH (Forward Transmit Diversity Assistant Pilot
Channel).
F-CCCH (Forward Common Control Channel)
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F-CCCH provides encoding interleave spreading and modulation spread spectrum
signals, used by the MS in the BTS coverage area. BTS will send the system
information and the designated MS information on this channel.
F-SYNCH (Forward Sync Channel)
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The MS in the coverage of BTS gets initial synchronization information from
F-SYNCH. The rate of synchronization channel is 1200bit/s and the frame length is
26.667ms. The PN of pilot signal in I channel and Q channel of synchronization
channel is the same as the PN in the pilot channel of the same BTS.
F-TCH (Forward Traffic Channel)
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F-TCH is used to send the user information and signaling information to an MS
during the call. F-TCH can be sub-divided into:
F-DCCH (Forward Dedicated Control Channel): bears traffic information and
signaling information.
F-FCH (Forward Fundamental Channel): bears traffic information.
F-PC sub-channel (Forward Power Control sub-channel): is the signals are sent only
in forward fundamental channel or forward dedicated control channel.
F-SCCH (Forward Supplemental Code Channel): bears traffic information,
applicable to RC1 and RC2.
F-SCH (Forward Supplemental Channel): bears traffic information, applicable to
RC3, RC4 and RC5.
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System Description
4 System Function
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