GPRS Introduction
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GPRS Introduction

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GPRS Introduction GPRS Introduction Presentation Transcript

  • 1 GPRS NISHI BHANU PRATAP SINGH ELECTRONICS AND COMMUNICATION ENGINEERING GALGOTIAS COLLEGE OF ENGINEERING & TECHNOLOGY, GREATER NOIDA
  • 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  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 .
  • 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
  • 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
  • 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
  • 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
  • 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)
  • 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
  • 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
  • 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)
  • GPRS Overview 12 GPRS Mobile States GPRS Attach GPRS Dettach Ready timer expiry or Force to Standby PDU Transmission Idle Ready Standby
  • 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
  • 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 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.
  • GPRS Overview 16 Thank you