Manual Part 1

Wider View of SDR-Based Network Section 1
Element Management System (EMS) 4.0 User Manual
6
1.3 Wider View of SDR-Based Network
Figure 4 provides a wide view of an SDR base station system. As shown, the BTS
application, running on the BTS server, is controlled over an A-bis interface by a
Base Station Controller (BSC). In an SDR system deployment, the A-bis interface
is over a packet switching network using Voice Over Internet Protocol (VoIP). A
single BSC can control several BTS applications. The BSC, in turn, is controlled
by a Message Switching Center (MSC), using a standard interface called the A-
Interface. The MSC provides connectivity to the external, landline Public
Switching Telephone Network (PSTN). The A-Interface can be carried over a
packet switching network or over traditional T1 lines.
Figure 4. Wide View of an SDR Base Station System
19443-A
LINUX
BTS
LINUX
BTS
REMOTE
UNIT
REMOTE
UNIT
EMS
EMS
LINUX
BTS
REMOTE
UNIT
LINUX
BTS
REMOTE
UNIT
LINUX
BTS
REMOTE
UNIT
LINUX
BTS
REMOTE
UNIT
LINUX
BTS
REMOTE
UNIT
UP TO 24
CAN
VOIP
PACKET
SWITCH
PSTN
PACKET
SWITCH
PACKET
SWITCH
BASE
STATION
CONTROLLER
(BSC)
MESSAGE
SWITCHING
CENTER
(MSC)
MULTIPLE BTSs
(UP TO n DEPENDING
ON BSC CAPACITY)
MULTIPLE
BSCs
(PUBLIC
SWITCHING
TELEPHONE
NETWORK)
T1/E1