GPRS Introduction

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GPRS Introduction

  1. 1. 1 GPRS NISHI BHANU PRATAP SINGH ELECTRONICS AND COMMUNICATION ENGINEERING GALGOTIAS COLLEGE OF ENGINEERING & TECHNOLOGY, GREATER NOIDA
  2. 2. 2 General Overview ► GPRS stands for General Packet Radio System. GPRS provides packet radio access for mobile GSM and TDMA users. ► The GPRS specifications are written by the European Telecommunications Standard Institute (ETSI), the European counterpart of the American National Standard Institute (ANSI). ► GPRS is a Mobile Data Service available to users of GSM and IS- 136 mobile phones. ► GPRS is packet-switched and multiple users share the same transmission channel for transmitting the data.
  3. 3. 3  GPRS is important as a migration step toward third-gen eration (3G) networks and allows network operators to i mplement an IP-based core architecture .  GPRS is a new bearer service for GSM that greatly impr oves and simplifies wireless access to packet data net works.  Networks based on the Internet Protocol and X.25 netw orks are also supported in the current versions of GPRS .
  4. 4. GPRS Overview 4GPRS Overview 4 Basic GSM System Architecture BTS BTS BTS BTS BTS BTS BSC BSC MSC HLR VLR AUC OMC PSTN ISDN CSPDN PSPDN MS MS Um Abis A TE
  5. 5. GPRS Overview 5 Basic GPRS System Architecture BTS BSC SGSN MSC/VLR HLR IP X.25 MS MS BSS Um TE GGSN PCU BTS BSC PCU Gs Gr GnGb
  6. 6. GPRS Overview 6GPRS Overview 6 GPRS Transmission Plane MS Relay Network Service GTP Application IP / X.25 SNDCP LLC RLC MAC GSM RF SNDCP LLC BSSGP L1bis RLC MAC GSM RF BSSGP L1bis Relay L2 L1 IP L2 L1 IP GTP IP / X.25 Um Gb Gn Gi MS BSS SGSN GGSN Network Service UDP / TCP UDP / TCP MS Gb Gn SGSN GGSNBTS BSC PCU
  7. 7. GPRS Overview 7GPRS Overview 7 GPRS Logical Channel Downlink & Uplink Downlink Uplink Downlink Downlink Downlink Logical Channel Signaling Channels Packet Traffic Channel Packet Broadcast Control Channel Packet Common Control Channel PDTCH PACCH PBCCH PRACH PPCH PAGCH PNCH Traffic Channels
  8. 8. GPRS Overview 8 Basic GPRS System Architecture  SGSN : The Serving GPRS Support Node (SGSN) – Same hierarchical level as the MSC – Serves attached mobiles – keeps track of the individual MSs' location and performs security functions and access control. – Connected to the BSS with Frame Relay(in future, ATM) – Data/packet Counting(for charging)
  9. 9. GPRS Overview 9 Basic GPRS System Architecture  GGSN : The Gateway GPRS Support Node – Interworking with external packet-switched networks – Connected with SGSNs via an IP-based GPRS backbone network. – The HLR is enhanced with GPRS subscriber information – Enhanced MSC/VLR : co-ordination of GPRS and non- GPRS services (paging , LA)  PCU : Packet Control Unit – Packet Segmentation – Radio Channel Allocation – QoS measurements
  10. 10. GPRS Overview 10 GPRS Attach/Dettach  Establishes a logical link between the MS and the SGSN  Performed when a mobile indicates its presence to the network, for the purpose of using the services provided by the network  Dependent upon the class of the mobile – IMSI attach for GSM circuit switched(CS) services – GPRS attach – Combined IMSI/GPRS attach
  11. 11. GPRS Overview 11 PDP Context Activation  PDP Context – Contains mapping and routing information btw. MS & GGSN – Activation  Allocation of PDP Address  Access point name(APN)  Quality of service required(QoS) – Priority (for packet transfer) – Reliability (of connection, I.e. loss of data) – Delay (within the network) – Throughput (data/time)
  12. 12. GPRS Overview 12 GPRS Mobile States GPRS Attach GPRS Dettach Ready timer expiry or Force to Standby PDU Transmission Idle Ready Standby
  13. 13. GPRS Overview 13 GPRS Mobile Class  Modes of operation Either GPRS or GSM services Both GPRS and GSM services Both GPRS and GSM services Attached to Alternate use onlyClass C Only operate one set of services at a timeClass B Simultaneous attach • monitor • traffic Class A SupportMode
  14. 14. GPRS Overview 14 GPRS Operation 1. GPRS Attach 2. PDP Activation Encapsulation & Tunneling PDNs GPRS Attach makes the MS known in the corresponding GGSN PDP Activation establishes a logical link between MS and SGSN Encapsulation & Tunneling data Packets are equipped with GPRS-specific protocol information and transferred between MS and GGSN 3. Data Transfer Gb Gn SGSN GGSNBTS BSC PCU
  15. 15. 15 Applications ► Communications: E-mail, fax, unified messaging and intranet/Inter net access etc. ► Value-added services: Information services and games etc. ► E-commerce: Retail, ticket purchasing, banking and financial tradi ng etc. ► Location-based applications: Navigation, traffic conditions, airline/ rail schedules and location finder etc. ► Vertical applications: Freight delivery, fleet management and sales- force automation. ► Advertising: Advertising may be location sensitive. For example, a user entering a mall can receive advertisements specific to the stor es in that mall.
  16. 16. GPRS Overview 16 Thank you

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