gprs a mobile internet architecture-ctdc
TRANSCRIPT
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GPRS a Mobile Internet
Architecture
Stas Khiman
CTO,Narus Inc.
CoolTech Club Founding Meeting
July 9, 2003
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Goals & Agenda
Acronyms flood - 2G, 3G, GSM, GPRS
Challenges of the Mobile IP
GPRS basic architecture
GPRS components GGSN
SGSN
GTP GPRS Tunneling Protocol Charging for GPRS services
Q&A
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Evolution2G , 2.5G and 3G
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GSM/GPRS acronyms
GSM - Global System for Mobile
communication
GPRS General Packet Radio Service
IMSI - International Mobile SubscriberIdentity
SIM Subscriber Identity Module
IMEI
International Mobile stationEquipment Identity
IP Internet protocol ( often address)
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GSM System Architecture
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Mobile IP challenge
Router
1.2.3.*
10.20.30.*
1.2.3.4
10.20.30.40
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GPRS System Architecture
PDN - Public Data Network
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GPRS Acronyms
SGSN Serving GPRS Supporting Node
GGSN Gateway GPRS SupportingNode
CGF Charging Gateway Functionality HLR Home Location Register
PDN Packet Data Network
PLMN Public Land Mobile Network
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GPRSLogical Architecture
(GSM 09.60 version 7.4.0 Release 1998)
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GPRS Routing ExampleTwo IPs assigned
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PDP Context
PDP: Packet Data Protocol (PDP) is anetwork protocol used by an externalpacket data network interfacing to GPRS.
PDP Context: Information sets held inMS and GSNs for a PDP address
NSAPI: Network Service Access PointIdentifier. An integer value in the range
[0; 15], identifying a certain PDP Context.
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PDP Context Activation Procedure
+ IP assignment
+ Roaming
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GPRS Transmission Plane
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GTP: GPRS Tunnelling Protocol(GSM 09.60 version 7.4.0 Release 1998)
TIDTunnel Identifier (IMSI + NSAPI)
NSAPI:Network Service Access Point
Identifier. An integer value in the range [0; 15],
identifying a certain PDP Context. It identifies
a PDP context belonging to a specific MM
Context ID.
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Protocols at Gi interface
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GPRS/Internet connection
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GPRS Charging
IRS Definition:
If you cant charge for you services,it is a hobby, not a business!
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GPRS Charging
3GPP TS 32.015 V3.8.0 (2001-12)
CGF: ChargingGateway Functionality
SCF: Service Control
Function
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Where to find specifications?
ETSI - European TelecommunicationsStandards Institute www.etsi.org - official specifications
3GPP - 3rd Generation Partnership Project www.3gpp.org - free specifications (work in progress)
http://www.comsoc.org/livepubs/surveys/pu
blic/3q99issue/bettstetter.html - very goodIEEE article , excellent starting point
http://www.etsi.org/http://www.3gpp.org/http://www.comsoc.org/livepubs/surveys/public/3q99issue/bettstetter.htmlhttp://www.comsoc.org/livepubs/surveys/public/3q99issue/bettstetter.htmlhttp://www.comsoc.org/livepubs/surveys/public/3q99issue/bettstetter.htmlhttp://www.comsoc.org/livepubs/surveys/public/3q99issue/bettstetter.htmlhttp://www.3gpp.org/http://www.etsi.org/ -
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Q & A