Specifications

Base Site Controller
iDEN® System
2-22 68P81095E55-E August 08, 2000
The MSC controls the Interconnect call setup and routing procedures like a land
network end-office. On the land network side, the MSC performs call signaling
functions. Other call control functions include:
• Number translations and routing
• Matrix path control
• Allocation of outgoing trunks.
• Collection of Interconnect call billing data
• Format of the call records
• Transfer of call records to the billing center or to tape
• Collection of traffic statistics for performance management
The MSC also helps to administer interconnect handover procedures. The handover
procedure preserves call connections as mobiles move from one coverage area to
another during an established interconnect call. Handovers within a cell group that is
controlled by a single BSC are controlled entirely by that BSC. When handovers are
between cells controlled by different BSCs, the handover procedure is coordinated at
the MSC. This is discussed in greater detail in Appendix D, Handover.
Home Location
Register
During an Interconnect call MSs are validated by the Home Location Register (HLR)
database. This database may exist as, part of the MSC, as separate computing system,
or a provided service. The identity, billing information, usage limitations and active
services for each MS are stored in the HLR. The HLR is the source of information on
the service provider’s network for the users’ service profile (identity and services)
that is used to assure the subscriber’s services follow the MS throughout the network.
The HLR:
• Contains the master database for all subscribers
• Supports multiple MSCs
• Contains the basic and active supplementary services for each subscriber
• Contains the location of the current VLR for each subscriber
• Contains information used by supplementary services
• Supports roaming by being remotely accessible to all MSCs and VLRs
• Provides a Fault Tolerant computer platform
• Support interfaces to a customer supplied Administrative Data Center (ADC)
• Contains the Authentication Center (AUC) with MSs Authentication Keys
• Supports SS7 connectivity to network’s Signal Transfer Point (STP) switches
The Administrative Data Center (ADC) is the service provider’s administrative and
business control equipment. The ADC may be used to enter/provision user
information and accepts system metrics and call records.
Visited Location
Register
MS units are tracked via fixed geographic Interconnect Location Areas (ILAs).
These areas are defined by the system operator based on the coverage area of the
EBTS sites. Location data is stored in the VLR. These records contain current
information like most recent location area and the feature provisioning table. The
VLR is always integrated with the MSC and the VLR accesses the HLR to download
subscriber information as MSs move into the VLRs coverage area. The functions
include: