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User Manual
Airbridge cBTS3612 CDMA Base Station
R-P C subchannel (Reverse Power Control sub-channel), only used to configure
RC3 and RC4. The MS shall supporting inner loop power control and outer loop
power control on this channel.
R-EACH (Reverse Enhanced Access Channel)
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R-EACH is used by MS to originate the communication with BTS, or respond to the
message that is specially sent to MS. R-EACH adopts random access protocol and
supports two types of access modes: Basic Access Mode and Reservation Access
Mode.
R-CCCH (Reverse Common Control Channel)
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R-CCCH is used to send the user and signaling information to BTS in case of not
using reverse traffic channel. Two access modes are supported: Reservation
Access Mode and Designated Access Mode.
&
Notes:
In Figure 4-12, the channel in shadow will be supported in the subsequent version.
For the location and function of the above channels in call procedure, please refer to" 4.2 Call
Procedure".
4.5.5 Easy Installation and Operation
RF blind mate technology is used in RF part of BTS. During the installation or
maintenance, the user just need to insert the modules into corresponding slots of
the subrack, and the tedious work of cabling is saved. BTS RF system can be
remotely
receive/transmit frequency can be modified easily. Alarm signal generated in RF part
is reported to OMC. In this way, the operator can control and monitor the operation
of RF part.
4.5.6 Diversity Receiv ing
BTS supports diversity receiv ing function, which is realized through two sets of
independent receivers (including antenna, feeder, CDU/DFU, RLDU).
The two receivers demodulate the received signals at the same time, and then the
baseband processing unit decodes the signals with diversity mergence algorithm to
obtain diversity gain. Diversity receiving enhances BTS receivers' capability to resist
attenuation, so that the BTS can achieve satisfactory receiving effect even in
complicated radio transmission conditions.
controlled
by
OMC,
transmit
power,
4-21
System Description
4 System Function
receiver
sensitivity
and
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