User's Manual

Overview of the Flexent‚ Modular Cell 4.0B cabinet
installation
1- 53
Lucent Technologies – Proprietary
See notice on first page
401-703-454
FOA Draft Issue 1
January, 2006
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T1/E1 connection to base
station
Regardless of the 2G/3G1X base station deployment configuration,
each base station within a graphical area is connected to a mobile
switching center (MSC) via one or more T1/E1 lines. Each T1/E1 line
is used to transfer call traffic for a number of mobile users to and from
the base station. The call traffic over the T1/E1 line from each user,
which may either be voice or 3G data message, is transferred in a time-
share fashion, where the traffic data from each mobile is transferred in
discrete DS0 time slots.
In addition to call traffic, a control DS0 time slot is used to transmit
signaling and control information between the base station and MSC.
In 1xEV-DO base station, and base stations that include 1xEV-DO, the
T1/E1 lines goes to uplink input router in the RAN network.
Mobile Switching Center
(MSC)
The T1/E1 lines carrying voice calls from all the base stations within a
covered area are received at the MSC by a 5ESS Digital Cellular
Switch (DCS). The DCS switches each voice call either to other DCSs
in the cellular network or the Public Switch Telephone Network
(PSTN) to complete mobile calls. When 3G -1X data messages are
received, the DCS provides connectivity to the Internet via the Packet
Data Service Node (PDSN). This connectivity is handle by the Packet
Control Function (PCF) in the MSC. The operation of the PDSN is
discussed in “Accessing the internet” on page 56.
The registering and routing of each call switched through the DCS is
controlled by the Executive Cellular Processor (ECP). The ECP
maintains the control database for all the base stations in the system.
After each base station is installed, the operating characteristics of the
base station and how the base station interacts with other neighboring
base stations is downloaded into the ECP as part of Operations,
Administration and Maintenance (OA&M) via the Operation/
Maintenance platform (OMP-FX). The database for base stations is
than used by the a group of Radio Cluster Server (RCS)/AP under the
supervision of Mobility Management AP to control the traffic data
though the base stations. Each RCS/AP is a dedicated computer
running up to 16 incidence of Radio Cluster Server (RCS) software on
a UNIX operating system. Each cellular call is register through the
RCS which generate switching signal information, causing the DCS to
routed the call from/to a base station that is in closest proximity to its
mobile user.