Cisco ASR 5000 Series, Обзор продукта

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Serving GPRS Support Node (SGSN) Overview
▀ Product Description
▄ Cisco ASR 5000 Series Product Overview
OL-22938-02
Product Description
The ASR 5000 provides a highly flexible and efficient Serving GPRS Support Node (SGSN) service to the wireless
carriers. Functioning as an SGSN, the system readily handles wireless data services within 2.5G General Packet Radio
Service (GPRS) and 3G Universal Mobile Telecommunications System (UMTS) data networks.
Important:
Throughout this chapter the designation for the subscriber equipment is referred to in various ways:
UE for user equipment (common to 3G/4G scenarios), MS or mobile station (common to 2G/2.5G scenarios), and MN
or mobile node (common to 2G/2.5G scenarios involving IP-level functions). Unless noted, these terms are equivalent
and the term used usually complies with usage in the relevant standards.
In a GPRS/UMTS network, the SGSN works in conjunction with radio access networks (RANs) and Gateway GPRS
Support Nodes (GGSNs) to:
Communicate with home location registers (HLR) via a Gr interface and mobile visitor location registers (VLRs)
via a Gs interface to register a subscriber‘s user equipment (UE), or to authenticate, retrieve or update
subscriber profile information.
Support Gd interface to provide short message service (SMS) and other text-based network services for attached
subscribers.
Activate and manage IPv4, IPv6, or point-to-point protocol (PPP) -type packet data protocol (PDP) contexts for
a subscriber session.
Setup and manage the data plane between the RAN and the GGSN providing high-speed data transfer with
configurable GEA0-3 ciphering.
Provide mobility management, location management, and session management for the duration of a call to
ensure smooth handover.
Provide various types of charging data records (CDRs) to attached accounting/billing storage mechanisms such
as our SMC-based hard drive or a GTPP Storage Server (GSS) or a charging gateway function (CGF).
Provide CALEA support for lawful intercepts.
This chapter catalogs many of the SGSN key components and features for data services within the GPRS/UMTS
environment. Also, a range of SGSN operational and compliance information is summarized with pointers to other
information sources.