User Guide

PAMS
Technical Documentation
NHD–4
System Overview
Page 3–12
Original 11/97
Line 1 in figure 11 is the state the mobile phone was at in figure 10. The mobile has
found the strongest control channel and is “In service”.
In line 2 the mobile phone transmits it’s ESN/MIN to the Base Station (only if not in
its home area) using 10 kbytes/s data via the control channel.
Line 3 shows the Base Station sending the mobile phone a data transmission
confirming TX registration. At this time the Cellular Mobile Telephone Exchange
knows the mobile phone is ON and operating and which Base Station is currently in
contact with the mobile phone. This is important if the mobile phone gets a call
from another phone. The cellular system needs to know where each operating
mobile is in order to route calls to them.
Line 4 shows the Base Station back to continuously transmitting its ID. The mobile
phone stays on channel 333 and shows “In service”. Periodically the mobile will
rescan the control channels to make sure that it is still locked on the strongest
control channel.