A New Dimension to Wireless Communication

2. Submitted by : Agha Musa khan & Paroze khanRoll no :041-bscs-2010 & 065-bscs-2010Submitted to : Prof. Salah-ud-din

3. General Packet Radio Service (GPRS) • A New Dimension to Wireless Communication

4. Contents of Presentation • Constraints with existing network • Comparison of GSM & GPRS • What is GPRS ? • GPRS IN PAKISTAN • Benefits of GPRS • Statistical Multiplexing • Salient Features of GPRS • High Data Rate • GPRS Services • GPRS Terminals • GPRS Network Elements

5. CONTENTS OF PRESERTATION • GPRS SYSTEM ARCHITECHTURE • INTERFACES • SGSN – Serving GPRS Support Node • GGSN – Gateway GPRS Support Node • GPRS Register • GPRS Backbone Network

6. Constraints with existing network • Data Rates too slow – about 9.6 kbps • Connection setup time too long • Inefficient resource utilization for bursty traffic • Proves expensive for bursty traffic utilization • No efficient method for packet transfers

7. Comparison of GSM & GPRS

8. What is GPRS ? General packet radio service (GPRS) is a packet orientedmobile data service on the 2G and 3Gcellular communication systems global system for mobile communications (GSM). The service is available to users in over 200 countries worldwide. GPRS was originally standardized byEuropean Telecommunications Standards Institute (ETSI) in response to the earlier CDPD and i-mode packet switched cellular technologies.

9. GPRS IN PAKISTAN • Telenor • Warid Telecom • China Mobile(ZONG) • Samsung Galaxy Tab • BlackBerry Pearl

10. Benefits of GPRS • New Data Services • High Speed (Data Rate 14.4 – 115 kbps) • Efficient use of radio bandwidth (Statistical Multiplexing) • Circuit switching & Packet Switching can be used in parallel • Constant connectivity

11. Statistical Multiplexing

12. Salient Features of GPRS • Important step on the path to 3G • Standardized by ETSI • GPRS is an overlay network over the GSM • Provides Data Packet delivery service • Support for leading internet communication protocols • Billing based on volume of data transferred • Utilizes existing GSM authentication and privacy procedures.

13. High Data Rate • GPRS uses radio channel i.e. 200 kHz wide • Radio channel carries digital data stream of 271 kbps • This rate is divided into 8 time slots each carrying 34 kbps per time slot • Data rate 14 kbps per time slot achieved after corrections • GPRS can combine upto 8 time slots giving data rate of 114 kbps

14. GPRS Services • Offers end-to-end packet switched data transfer • Bearer Services • PTP - Point-To-Point service (CLNS mode) • PTM - Point-To-Multipoint service(CONS Mode) • PTM-M Multicast service • PTM-G Group call service • Supplementary Services • SMS Short Message Service • CFU Call Forwarding Unconditional

15. GPRS Services (Contd.) • CFNRc Call Forwarding on mobile subscriber not reachable • CUG Closed User Group • Tele action, access to data bases • Quality of Service • GPRS allows defining QoS profiles • Service precedence, reliability, delay,throughput

16. GPRS Terminals • Class A • MS supports simultaneous operation of GPRS and GSM services • Class B • MS able to register with the n/w for both GPRS & GSM services simultaneously. It can only use one of the two services at a given time. • Class C • MS can attach for either GPRS or GSM services

17. GPRS Network Elements GPRS Architecture is same as GSM except few hardware modifications : • GPRS includes GSNs • SGSN : Serving GPRS Support Node • GGSN : Gateway GPRS Support Node • GPRS Register

18. GPRS SYSTEM ARCHITUCTURE Other GPRS PLMN Gd SMS-GMSC SMS-INMSC SGSN Gp GGSN Gb Gn GGSN Gf BTS BSC Gr Gs PDN Gi Gc BTS EIR HLR+GPRS Register MS D MSC/VLR

19. Interfaces • Gb – Connects BSC with SGSN • Gn – SGSN – SGSN/GGSN (in the same network) • Gp – SGSN –GGSN (in different networks) • Gf – For equipment querying at registering time • Gi – Connects PLMN with external Packet Data Networks (PDNs) • Gr – To exchange User profile between HLR & SGSN • Gs – To exchange Database between SGSN & MSC • Gd – Interface between SMS & GPRS

20. SGSN – Serving GPRS Support Node • Delivers data packets to mobile stations & vice-versa • Detect and Register new GPRS MS in its serving area • Packet Routing, Transfer & Mobility Management • Authentication, Maintaining user profiles • Its location register stores location info. & user profiles

21. GGSN – Gateway GPRS Support Node • Interfaces GPRS backbone network & external packet data networks • Converts the GPRS packets from SGSN to the PDP format • Converts PDP addresses change to GSM addresses of the destination user • Stores the current SGSN address and profile of the user in its location register • Performs authentication • Many-to- many relations among SGSNs & GGSNs

22. GPRS Register • GPRS Register is integrated with GSM-HLR. • Maintains the GPRS subscriber data and Routing information. • Stores current SGSN address

23. GPRS Backbone Network • GSNs are connected through IP based backbone • Two Backbones: • Intra PLMN backbone networks that connects GSNs of the same PLMN & are private IP networks • Inter PLMN backbone networks that connects GSNs of the different PLMN. Roaming agreement is necessary • GPRS Tunneling protocol (GTP) • PLMN- Inter PLMN interconnect are called Border gateways (performs security functions to protect Intra- PLMN backbone against unauthorized users and attacks).

24. GPRS BACKBONE NETWORK BSC BSC BTS BTS MS inter-PLMN GPRS backbone PLMN1 Gn SGSN Gp Gp SGSN Gn Border gateway intra-PLMN GPRS backbone Border gateway intra-PLMN GPRS backbone Gn Gn Gn PLMN2 Gi Gi GGSN GGSN External Packet Data Network (PDN) Host SGSN Router LAN

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