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10
1
Chapter 1
Inmarsat Network
1.5 Core Network
Figure 1-18: Core Network
1.5.1 HLR (Home Location Registry)
A database residing in the BGAN network that contains Service
profi les:
•
The “identity” of a local subscriber SIM card details:
•
Home country
•
Details of every SIM card
•
ICC-ID
•
stored MSISDN
•
AMSISDNs
•
IMSI
The HLR provides routing information for MT (Mobile Terminated)
calls and SMS (Short Message Service).
The HLR is also responsible for the maintenance of user
subscription information. This is distributed to the relevant VLR
(Visitor Location Register) or SGSN (Serving GPRS Support
Node) through the attach process and mobility
management procedures such as Location Area and Routing Area
updates.
1.5.2 MSC/VLR/MGW/SMSC/FRINs
MSC
(Mobile Switching Centre):
Switch within a cellular network which can internetwork with
location data bases
VLR
(Visitors Location Register):
The Visitors Location Register contains all subscriber data
required for cs-call handling and mobility management for mobile
subscribers currently located in the area controlled by the VLR.
MGW
(Media Gateway):
A gateway that supports both bearer traffi c and signalling traffi c.
Figure 1-19
Figure 1-20
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