Motorola M3097 Service Manual download pdf (Page 25)

©1999 Motorola, Inc.

TDMA M3090/M3097Cellular Overview

14

Cellular Telephone Landline Network

(D)ST +

SAT

Switch / Cell Site

VOICE + (D)SAT

DATA

(D)SAT

VOICE + (D)SAT

Conversation in progress.

The voice path is unmuted.

The new cell site receives the

correct SAT (DSAT) and unmutes

the voice path.

Conversation in progress.

The voice path is unmuted.

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).

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

The originally assigned cell site

receives the signaling tone

(DST) and informs the switch to

continue with the handoff.

The switch moves the landline to the

voice channel at the new cell site.

Conversation in progress.

The voice path is unmuted.

FOVC

REVC

REVC

FOVC & REVC

FOVC & REVC

Figure 9. Cell Site Handoffs

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