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GPRS
GPRS
GPRS
GPRS
GPRS
GPRS
GPRS
GPRS
GPRS
GPRS
GPRS
GPRS
GPRS
GPRS
GPRS
GPRS
GPRS
GPRS
GPRS
GPRS
GPRS
GPRS
GPRS
GPRS
GPRS
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GPRS

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  • 1. General Packet Radio Service 王詔丘
  • 2. GPRS History
    • Established by ETSI(European Telecommunications Standards Institute)
    • GSM phase 1 --- 1992
    • GSM phase 2 --- 1996
    • GPRS begin in 1994 and published at the end of 1997
  • 3. General Packet Radio Service
    • Packet switching
    • GPRS is evolved from GSM by introducing two new core network nodes SGSN and GGSN
    • Existing GSM nodes(BSS,MSC/VLR and HLR) are upgraded
    • Concept foresees bit rates of nearly 170kb/s
    • QoS Support : service precedence 、 delay 、 reliability 、 mean throughput 、 peak throughput etc. QoS parameters
  • 4. General Packet Radio Service
    • Several users can use the same channel simultaneously
    • Always on line
    • Radio resource allocation
    • Charging is based on amount of transmitted data
    • No need to access HLR for every GPRS packet
    • Burst data transmission
  • 5. GPRS Objectives
    • GPRS uses packet switched resource allocation
    • Dynamic channel allocation
      • 1 to 8 time slots
      • Available resources shared by active users
      • Up and down link channels reserved separately
      • GPRS and circuit switched (GSM) services can use same time slots alternatively
    • Efficient delivery of SMS over the GPRS air interface
    • Connections with data networks
      • IP network,X.25,GPRS own protocols
  • 6. GPRS Development
    • Phase
      • Point-to-Point
      • Point-to-Multipoint
    • Class
      • Support GPRS and other GSM simultaneously
      • Support GPRS and GSM network parallel
      • Only GPRS
    • Multi-slot Type
      • Half-Duplex
      • Full-Duplex
  • 7. Service type of GPRS
    • GPRS provides two types of services:
      • PTP (Point-To-Point)
        • Connectionless: IP
        • Connection-oriented: X.25
      • PTM (Point-To-Multipoint)
        • Multicast Service (PTM-M)
        • Group Call Service (PTM-G)
  • 8. GPRS Applications
    • WWW
    • FTP
    • Telnet
    • Chat
    • E-mail
    • Image
    • Audio
    • Video
    • GPS(Global Positioning System)
  • 9. GSM Architecture
    • MS(Mobile Station)
    • BSS(Base Station Subsystem)
    • BTS(Base Transceiver Station)
    • BSC(Base Station Controller)
    • MSC(Mobile Switching Center)
    • PSTN(Public Switched Telephone Network)
    • HLR(Home Location Register)
    • VLR(Visitor Location Register)
    • AUC(Authentication Center)
  • 10. GSM Architecture
  • 11. GPRS Architecture
  • 12. Comparison between GPRS & Circuit-switched
  • 13. GPRS Architecture
  • 14. GPRS Components
    • GPRS support node(GSN)
      • Packet routing and transfer within PLMN(Public Land Mobile Network)
    • Gateway GPRS support node(GGSN)
      • Acts as a logical interface to external PDN(Packet Data Network)
      • Maintains routing information used to tunnel the PDUs(Protocol Data Unit) to the SGSN currently serving the MS(Mobile Station)
    • Serving GPRS support node(SGSN)
      • Delivery of packets to the MSs within its service area
  • 15. Mobile Transmission
    • SGSN(SGSN-S) encapsulates the packets transmitted by the MS and routes them to the appropriate GGSN(GGSN-S)
    • Based on the examination of the destination address, packets are then routed to the GGSN-D through the packet data network
    • The GGSN-D checks the routing context associated with the destination address and determines the SGSN-D and relevant tunneling information
    • Each packet is then encapsulated and forwarded to the SGSN-D, which delivers it to the destination mobile
  • 16. Simple example of transmission
  • 17. Packet Data Transmission Scenario
    • Mobile-originated
      • MS to some LAN host
    • Mobile-terminated
      • Receive packet from some host when MS is in Home Public Land Mobile Network ( PLMN )
    • Mobile-terminated
      • Receive packet from some host when MS is roaming at some Visited Public Land Mobile Network ( PLMN )
  • 18. Simple example of routing
  • 19. GPRS Architecture
  • 20. GPRS Coding Scheme
    • Best reliability : CS-1
    • No reliability : CS-4
    • Maximum data rate : 171.2Kbps(21.4Kbps x 8) with eight time slots
  • 21. FDMA & TDMA
  • 22. Mobility Management
    • Two encapsulation schemes:
      • Between GSNs
      • Between MS and SGSN
    • Before MS sends data, MS has to attach to GPRS using an attachment procedure
    • When moving to another SGSN(location update), GGSN and GR/HLR are informed about the new routing context
  • 23. Mobility Management
    • State Diagram
  • 24. GPRS Protocols
    • Sub-Network Dependent Convergence Protocol (SNDCP)
      • maps a network-level protocol
      • provides compression, segmentation and multiplexing of network-layer messages to a single virtual connection
    • Logical Link Control (LLC)
      • assures the reliable transfer of user data across a wireless network
    • Base Station System GPRS Protocol (BSSGP)
      • processes routing and QoS information
      • uses the Frame Relay Q.922 core protocol
    • GPRS Tunnel Protocol (GTP)
      • tunnels the protocol data units between GSNs
  • 25. GPRS Protocols
    • GPRS Mobility Management (GMM)
      • handles roaming, authentication, and selection of encryption algorithms
    • Network Service
      • maps BSSGP's service requests to the Frame Relay Q.922 Core
    • Radio Link Control(RLC)/MAC
      • Enable multiple MSs to share a common transmission medium which consist of several physical channels
    • Physical Link Sublayer(PLL)
      • Data coding, detection and correction
    • Physical RF Sublayer(RFL)
      • Perform the modulation and demodulation of the physical waveforms
  • 26. Protocol Architecture
  • 27. Air Interface – Physical Layer
    • GPRS air interface protocol is concerned with communication between MS and BSS
    • Physical Channel divided into Packet Data Channel ( PDCH ) and Traffic Channel ( TCH ) ,
    • PDCH --- Dedicated to Packet Data Traffic ,
    • TCH --- GSM Voice or Data Traffic 。
    • Allocation of TCHs and PDCHs is done dynamically according to the 「 Capacity-on-demand 」 principles
  • 28. GPRS Architecture
  • 29. GPRS Protocol Stack
  • 30. GPRS Logical Channels
    • Packet Broadcast Control Channel(PBCCH)
      • Transmits system information to all GPRS terminals in a cell
    • Packet Common Control Channel(PCCCH)
      • Initiate packet transfers or respond to paging messages
    • Packet Traffic Channels(PTCH)
      • Channel resource allocation
  • 31. GPRS Logical Channels(cont.)
  • 32. Uplink
  • 33. Downlink
  • 34. HSCSD and EDGE
    • High-Speed Circuit-Switched Data ( HSCSD )
      • Multi-timeslot
      • Using V42bis coding scheme can achieve 14.4Kbps
      • Maximum data rate : 115.2Kbps(14.4Kbps * 8)
      • Circuit switching
    • Enhanced Data for GSM Evolution ( EDGE )
      • Maximum data rate : 384kbps
      • EDGE use the new Modulation Technique --- eight-phase-shift ( 8PSK )
      • Support Packet switching and Circuit switching simultaneously
  • 35. GPRS Glossary
    • ETSI(European Telecommunications Standards Institute)
    • MS(Mobile Station)
    • BSS(Base Station Subsystem)
    • BTS(Base Transceiver Station)
    • BSC(Base Station Controller)
    • MSC(Mobile Switching Center)
    • PSTN(Public Switched Telephone Network)
    • HLR(Home Location Register)
    • VLR(Visitor Location Register)
    • AUC(Authentication Center)
    • GPRS support node(GSN)
    • Gateway GPRS support node(GGSN)
    • Serving GPRS support node(SGSN)
    • packet data network(PDN)
    • Public Land Mobile Network ( PLMN )
    • Sub-Network Dependent Convergence Protocol (SNDCP)
    • Logical Link Control (LLC)
    • Base Station System GPRS Protocol (BSSGP)
    • GPRS Tunnel Protocol (GTP)
    • GPRS Mobility Management (GMM)
    • Packet Data Channel ( PDCH )
    • Traffic Channel ( TCH )
    • Packet Broadcast Control Channel(PBCCH)
    • Packet Common Control Channel(PCCCH)
    • Packet Traffic Channels(PTCH)
    • High-Speed Circuit-Switched Data ( HSCSD )
    • Enhanced Data for GSM Evolution ( EDGE )
  • 36. Reference
    • J. Cai and DJ Goodman, General Packet Radio Service in GSM , IEEE Communications, vol. 35, no. 10, pp. 122-131, October 1997
    • G. Brasche and B. Walke, Concepts , Services , and Protocols of the New GSM Phase 2+ General Packet Radio Service, IEEE Communications, vol. 35, no. 8, pp. 94-104, Aug 1997
    • C. Bettstetter, GSM PHASE 2+ GENERAL PACKET RADIO SERVICE GPRS:ARCHITECTURE, PROTOCOLS AND AIR INTERFACE, IEEE Communications,1997

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