간단 지식창고

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O GPRS(General Packet Radio Service)
: 무선 데이터 서비스를 제공하는 2.5G 기술로 GSM 기반임

O UMTS(Universal Mobile Telecommunications System)
: 무선 데이터 서비스를 제공하는 3G 접속망 기술로 CDMA 기반임

O GPRS & UMTS 핵심구성 요소
- SGSN(Serving GPRS support Node)
: Access와 Core망을 연결하여 GGSN으로 세션을 tunneling 함
- GGSN(Gateway GPRS Support Node)
: 단말을 PDN 및 IP망과 연결하는 구성요소

O 접속순서
: UE > RAN > SGSN > GGSN > IP N/W



O CISCO 설명 참고
GPRS and UMTS are evolutions of the global system for mobile communication (GSM) networks.
GSM is a digital cellular technology that is used worldwide, predominantly in Europe and Asia. GSM is
the world’s leading standard in digital wireless communications.
GPRS is a 2.5G mobile communications technology that enables mobile wireless service providers to
offer their mobile subscribers packet-based data services over GSM networks. Common applications of
GPRS include the following: Internet access, intranet/corporate access, instant messaging, and
mutlimedia messaging. GPRS was standardized by the European Telecommunications Standards
Institute (ETSI), but today is standardized by the Third Generation Partnership Program (3GPP).
UMTS is a 3G mobile communications technology that provides wideband code division multiple
access (CDMA) radio technology. The CDMA technology offers higher throughput, real-time services,
and end-to-end quality of service (QoS), and delivers pictures, graphics, video communications, and
other multimedia information as well as voice and data to mobile wireless subscribers. UMTS is
standardized by the 3GPP.
The GPRS/UMTS packet core comprises two major network elements:
• Gateway GPRS support node (GGSN)—a gateway that provides mobile cell phone users access to
a public data network (PDN) or specified private IP networks. The GGSN function is implemented
via Cisco IOS software on the Cisco 7200 series router or on the Cisco Multi-Processor WAN
Application Module (MWAM) installed in a Catalyst 6500 series switch or Cisco 7600 series
Internet router. Cisco IOS GGSN Release 4.0 and later provides both the 2.5G GPRS and 3G UMTS
GGSN functions.1-2
• Serving GPRS support node (SGSN)—connects the radio access network (RAN) to the
GPRS/UMTS core and tunnels user sessions to the GGSN. The SGSN sends data to and receives
data from mobile stations, and maintains information about the location of a mobile station (MS).
The SGSN communicates directly with the MS and the GGSN. SGSN support is available from
Cisco partners or other vendors.

http://www.cisco.com/c/en/us/td/docs/ios/mwgprs/configuration/guide/12_4t/mwg_12_4t_book/mwg_ggsnover.pdf