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Cellular Overview
Analog Cellular
Placing a Call (Mobile to Land or Mobile to
Mobile)
When the cellular telephone user originates
the call, the cellular telephone re-scans
the access channels to assure that it is still
tuned to the strongest one. The cellular tele-
Figure 7. Cellular Telephone to Land Call Processing
Cellular Telephone
The cellular telephone is
tuned to the access / paging
channel, and responds to
requests for data.
The cellular telephone user
dials a telephone number
and presses SND. The tele-
phone rescans the access
channels for the strongest
signal. The telephone
sends out data, including
the dialed digits, MIN, ESN,
and NAMPS or digital
capability to the cell site.
The cellular telephone
receives the voice channel
assignment, drops the
access channel, tunes to the
voice channel, and
transponds the assigned
SAT or DSAT.
The cellular telephone user
hears the landline ringing.
Conversation in progress
10
phone then transmits data at the rate of 10
kilobits per second on the control channel to
notify the switch of its mobile identification
number (MIN) and the number it wants to
reach. The switch verifies the incoming data
and assigns a voice channel and a SAT (or
DSAT for NAMPS channels) to the telephone.
Switch / Cell Site
DATA
Overhead data is sent out
on the control channels.
FOCC
&
RECC
The cell site receives the
mobile-to-land call request.
The cell site sends the data to
DATA
the switch. The switch
RECC
verifies the MIN & ESN and
then sends out the call to the
landline network.
The switch assigns a voice
channel and SAT or DSAT.
The voice channel assign-
DATA
ment is sent to the cellular
FOCC
telephone on the access
channel. The cell site sends
SAT or DSAT to the cellular
telephone on the assigned
(D)SAT
voice channel.
FOVC
The cell site receives the
(D)SAT
correct SAT or DSAT, then
REVC
unmutes the voice path.
VOICE + (D)SAT
FOVC & REVC
©2000 Motorola, Inc.
TDMA T2290/T2297
Landline Network
The local telephone
company processes the
telephone call.
The landline person being
called answers.
Conversation in progress
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