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Chapter 6, Call Processing Subsystem
Description of the Call Processing Subsystem
Description of the Call Processing Subsystem
110
The Call Processing Subsystem, which comprises five call processing screens,
allows the Test Set to simulate a cellular base station. The Call Processing
Subsystem provides, through host firmware control, the specific signals and
protocol messages necessary to automatically establish and maintain a cellular
link between the Test Set and a cellular phone (mobile station).
Once the link is established the operator can exercise the call processing functions
of the mobile station, such as
•
the decoding of orders from the base station, such as orders to retune the transceiver to
a new channel, to alert the mobile station user to an incoming call, to adjust the
transceiver output power level, or to release the mobile station upon completion of a
call.
•
the encoding of signaling information for transmission to the base station, such as
dialed digits for call origination, disconnect signal at the completion of a call, or mobile
identification number.
In addition, when the link is established the Test Set performs the following
functions automatically:
•
measures some of the basic RF characteristics of the mobile station's transmitted
carrier, such as; transmitter power, frequency accuracy, and modulation deviation
•
decodes and displays various reverse control channel and reverse voice channel
signaling messages
When sending forward control channel and forward voice channel messages, you
can set the bit pattern to an industry standard or to a pattern of your choice. The
ability to set the bit patterns gives the operator the opportunity to interject errors
into the signaling message, and test the mobile station's ability to find these
errors.
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