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Cellular Overview
Figure 9. Cell Site Handoffs
Cellular Telephone
Conversation in progress.
The voice path is unmuted.
The cellular telephone
acknowledges the handoff
request by sending a10 kHz
signaling tone for 50 msec or
a DST message. The voice
path is muted while sending
ST.
The telephone drops the
voice channel and keys up
on the new voice channel
frequency. The telephone
sends the newly assigned
SAT (DSAT).
Conversation in progress.
The voice path is unmuted.
14
Switch / Cell Site
VOICE + (D)SAT
FOVC & REVC
The cell site monitors the cellular
telephone's signal strength. When
the signal strength falls below the
allowed minimum (typically
-100 dBm at the highest power
step), the cell site informs the
switch of the need for a handoff.
The switch orders surrounding cell
sites to measure the cellular
telephone's signal strength. The
switch assigns a new cell site,
voice channel, and SAT (DSAT)
based on the highest signal
strength, and informs both cell
sites. The old cell site mutes the
voice path and sends a data burst
with handoff information to the
cellular telephone
DATA
FOVC
(D)ST +
The originally assigned cell site
SAT
receives the signaling tone
REVC
(DST) and informs the switch to
continue with the handoff.
The switch moves the landline to the
voice channel at the new cell site.
(D)SAT
The new cell site receives the
correct SAT (DSAT) and unmutes
REVC
the voice path.
VOICE + (D)SAT
FOVC & REVC
© 2000 Motorola, Inc.
TDMA Timeport™ P8190
Landline Network
Conversation in progress.
The voice path is unmuted.
Conversation in progress.
The voice path is unmuted.
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