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GPRS/EDGE OVERVIEW

GPRS/EDGE OVERVIEW. Course contents. GPRS Background and Evolution GSM/GPRS network GPRS Architecture IP Addressing in GPRS GPRS Air Interfaces MS types and Coding Schemes Mobility Management PDP Context Activation Sequence GPRS Roaming GPRS Charging

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GPRS/EDGE OVERVIEW

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  1. GPRS/EDGE OVERVIEW

  2. Course contents • GPRS Background and Evolution • GSM/GPRS network • GPRS Architecture • IP Addressing in GPRS • GPRS Air Interfaces • MS types and Coding Schemes • Mobility Management • PDP Context Activation Sequence • GPRS Roaming • GPRS Charging • Practical Demonstration of GPRS

  3. GPRS BACKGROUND AND EVOLUTION

  4. GPRS BACK GROUND • With Mobile penetration reaching its full potential, GPRS gives Mobile operators competitive edge and optimum use of the infrastructure. • SMS is a good example of just how hungry users are for data services. • The main Objective of GPRS is to offer the access to standard data networks, using protocols e.g. TCP/IP and X.25 • Transactions such as Credit Card checks and a variety of telemetric applications benefit from the fast session set-ups. • GPRS enables efficient use of radio resources by allowing many data users to share the same interface on a statistical basis. • The main benefits of GPRS are that it reserves radio resources only when there is data to be sent • Mobile users doesn’t have to connect to the network each time he wants to transfer the data, he can stay connected all day.

  5. Evolution from GSM to 3G The GSM Growth Phases 3G EDGE GPRS 2.5G HSCSD GSM 2G

  6. GSM Evolution 2G 2.5G 3G UMTS GSM GPRS EDGE UMTS 5 MHz carrier 2 Mbps peak data rates New IMT-2000 2 GHz spectrum GSM 200 KHz carrier 8 full-rate time slots 16 half-rate time slots GPRS 200 KHz carrier 115 Kbps peak data rates EDGE 200 KHz carrier Data rates up to 384 Kbps 8-PSK modulation Higher symbol rate HSCSD HSCSD Circuit-switched data 64 Kbps peak data rates

  7. MAIN ADVANTAGES FOR OPERATORS • More Revenue : • By providing more than a mobile connection. • Also operator can charge on the basis of type and amount of content accessed. • Huge Potential Market for Data Sevices : • Mobile Phone and Internet, both are fastest growing technologies and GPRS is the merger of two. • Fast Roll-out and Continuous Network Expansion : • GPRS is an integral part of GSM. • GPRS uses excess voice capacity for data : • GPRS Packets are transmitted in short, free periods between busy hour calls.

  8. GPRS packets can be transmitted in 16 the short free periods between busy hour calls 14 12 2TRX = 14 Speech TS 2% blocking means 10 8 Erlang speech traffic TCH 8 Ø On average 6 TS free ! 6 4 16 2 14 12 10 TC 0 8 H 6 1:00 PM 1:15 PM 1:30 PM 1:45 PM 4 2 0 03:00 06:00 09:00 12:00 15:00 18:00 21:00 00:00 Free GSM Capacity

  9. GPRS Vs GSM GPRS Vs GSM 1. SUPPORTS BOTH CKT. Only circuit switched. SWITCHED as well as packet switched service. 2. MS Utilizes Automatic No re-transmission is retransmission (ARQ) at provided. data link layer to re-transmit error frames. 3. Multiple time slots can be Single time slot per user. allotted to a single user 4. One time slot can be allotted Single time slot per user. to several users. 5. Charging/ billing more complex Simple time-based billing. (Volume based, Q.O.S. based)

  10. TYPICAL GPRS SERVICES * Communications-E-mail, fax, intranet/ internet access. * Value added services -Information services, games, e-commerce. * Location-based applications -Navigation, traffic conditions, airline/rail schedule, location finder. * Vertical applications -Freight delivery, fleet management, sales-force automation * Location sensitiveA user nearing a cinema hall or Advertising -a restaurant receives flashes of advertisement

  11. GPRSNETWORK ELEMENTS

  12. GSM NETWORK ELEMENTS • The Main elements of GSM are: • NSS : • MSC • VLR • HLR (Includes Authentication Center and Equipment Identity Register) • BSS : • BSC • BTS • Transcoder • NMS • Fault Management • Configuration Management • Performance Management

  13. GPRS Network Elements • Network ElementSoftwareHardware • SGSN SG1 DX Platform • GGSN G1 IP650 • Firewall Checkpoint IP650 • Ethernet Switch N/A Cisco Catalyst • DNS HP-UX 11.00 HP 9000 A class • CG HP-UX 10.20 HP K class • Border Gateway BGP4 IP650 • DHCP HP-UX 11.00 HP 9000 A class

  14. GPRS ARCHITECTURE

  15. GPRS Interface

  16. SGSN Role • Authentication, Authorization • GTP tunneling to GGSN • Ciphering & compression • Mobility Management • Session Management • Interaction with HLR, MSC/VLR • Charging & statistics • NMS interfaces

  17. GGSN Role • Interface to external data networks • Encapsulate in GTP and forwards end user data to right SGSN • Routes mobile originated packets to right destination • Filters end user traffic • Collects charging and statistic information for data network usage

  18. GPRSAIR INTERFACES

  19. Different GPRS Capacity Types Circuit Switched TRX 1 CCCH TS TS TS TS TS TS TS Territory Packet TRX 2 TS TS TS TS TS TS TS TS TS TS TS TS Switched Territory Additional Dedicated GPRS GPRS GPRS Capacity Capacity Capacity Territory border moves based on Circuit Switched traffic load

  20. GPRSMS CLASS & CODING SCEMES

  21. MS Class • CLASS A: Supports simultaneous attach, simultaneous activation, simultaneous monitor, simultaneous invocation, and simultaneous traffic. • CLASS B: Simultaneous traffic shall is not supported. The mobile user can make and/or receive calls on either of the two services sequentially but not simultaneously. The selection of the appropriate service is performed automatically • CLASS C: Supports only non-simultaneous attach. Alternate use only. • The status of the service which has not been selected is detached, that is, not reachable.

  22. GPRS Channel Coding Schemes

  23. GPRSMOBILITY MANAGEMENT

  24. Mobility Management State GPRS Attach / Detach Ready Idle READY Timer Expiry Packet Standby TX/RX STANDBY Timer Expiry MS location known to MS location known to cell level. MS location SGSN level. MS is transmitting or has not known. MS is capable of receiving just been transmitting. Subscriber is not Point-to-Multipoint data MS is capable of receiving reachable by the and being paged for Point-to-Point data and GPRS NW. Point-to-Point data Point-to-Multipoint data.

  25. Routing Area • RAI = MCC+MNC+LAC+RAC

  26. GPRS Mobility Management • Routing Area : • The RA is a new concept for tracing the MS location. • Cell =< RA =< LA served by one SGSN • RAI = MCC + MNC + LAC + RAC • Every time the MS sees the new RAI is has to initiate the RA • update procedure.

  27. GPRS Mobility Management • Mobility Management States : • The IDLE State is when the MS is not connected. • The Standby State is when the MS is connected to the GPRS Network • The Ready State is when the MS is ready to connect to the external IP Network. • Changing between states can be initiated from the MS, from the network and from the timers set.

  28. PDP CONTEXT ACTIVATION

  29. PDP Context ActivationAccessing the HLR 2. 1. GPRS Backbone IP Network Intranet SS7 Internet • (1) MS sends "Activate PDP Context Request" to SGSN • Access Point Name • PDP Type (IP) • PDP Address (empty == dynamic) HLR BSC BTS • (2) SGSN checks against HLR • Access Point Name • Dynamic / static IP address APN= "Intranet.Ltd.com" SGSN DNS Access Point GGSN • Access Point Name = Reference to an external packet data network the user wants to connect to

  30. SECURITY IN GPRS GPRS SYSTEM HAS INHERITED THE GSM PH-2 SECURITY FUNCTIONS • Authentication of the subscriber • IMEI Checking • User Identity Confidentiality (TMSI in GSM, P-TMSI in GPRS) • Ciphering of the data traffic between MS and SGSN • Private IP Addressing in the GPRS backbone. • Ciphered links and authentication between nodes in the GPRS Backbone. • Screening of packets coming from the external networks (Firewall). (P-TMSI is used to derive the Temp Logical Link Identity (TLLI)) ADDITIONAL GPRS SECURITY FEATURES ARE

  31. The Abbreviation GPRS = General Packet Radio System EGPRS = GPRS + EDGE modulation

  32. EDGE – Provide 3G services today • Provide 3G services with existing licenses • New modulation optimized for wireless data services • Link adaptation: Take highest possible rate • Covered by existing GSM licenses • Same channel structure, network infrastructure, frequency • planning and protocol as today’s GSM

  33. Evolution to EDGE SMS G/IW MSC HLR Gd AUC M S PUC BTS BSC MSC/VLR Gr ISP Network Gs Gb EDGE TRU Gi M S SGSN GGSN Gn CorporateNetwork Gn Backbone Network

  34. EDGE increases capacity voice voice voice voice voice Standard GSM Transceiver voice voice voice Data voice voice Free TS Free TS EDGE Transceiver

  35. System upgrade for EDGE EDGE TRU B S C R B S BSC Software Upgrade EDGE enabled RBS

  36. What EDGE would mean to subscribers • Streaming Applications • Very high speed downloads • Corporate Intranet connections • Quicker MMS • Video Phone • Vertical corporate applications – Video • Conference, Remote presentations

  37. Thank You!

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