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GPRS Overview. Kwak Min Seok Samsung Electronics R & D 3Group Mobile Communication Division. Contents. GPRS overview Features Applications GPRS System Arcitecture Overview GPRS Mobile Operation Attach/Dettach PDP Context Activation GPRS Mobile States GPRS Mobile Class

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gprs overview

GPRS Overview

Kwak Min Seok

Samsung Electronics

R & D 3Group

Mobile Communication Division

GPRS Overview

contents
Contents
  • GPRS overview
    • Features
    • Applications
  • GPRS System Arcitecture Overview
  • GPRS Mobile Operation
    • Attach/Dettach
    • PDP Context Activation
    • GPRS Mobile States
    • GPRS Mobile Class
  • S/W architecture

GPRS Overview

gprs features
GPRS Features
  • Sits on existing GSM network
  • Many users – Multiflexing
  • Packet Switched
    • Uses a packet mode technique
  • Fast switching of Resources
  • Interworking compatible with other Data networks
    • TCP/IP, X.25, etc
  • High data rates – 171.2kbps
  • Supports a wide range of Applications
  • Quality of Service
  • Charging is based on the amount of data transferred

GPRS Overview

gprs applications
GPRS Applications
  • Mobile office Applications
  • Internet
    • Web browsing, File transfer,…
  • Online banking
  • Moving or still images
    • Upload, Download
  • Traffic information
  • Vehicle positioning
    • GPS
  • Information Services
    • News,Ticketing,…

GPRS Overview

basic gsm system architecture

BTS

HLR

VLR

AUC

MS

BTS

BSC

PSTN

BTS

ISDN

MSC

CSPDN

A

MS

BTS

PSPDN

BTS

BSC

OMC

Abis

TE

BTS

Um

Basic GSM System Architecture

GPRS Overview

basic gprs system architecture

MS

MSC/VLR

HLR

Gs

Gr

BTS

BSC

PCU

IP

SGSN

GGSN

Gb

Gn

MS

X.25

BTS

BSC

PCU

Um

TE

BSS

Basic GPRS System Architecture

GPRS Overview

gprs transmission plane

BTS

BSC

PCU

SGSN

GGSN

Gn

Gb

MS

Application

IP / X.25

IP / X.25

Relay

SNDCP

GTP

SNDCP

GTP

LLC

LLC

UDP /

UDP /

TCP

TCP

Relay

RLC

BSSGP

RLC

BSSGP

IP

IP

MAC

MAC

Network

Network

L2

L2

Service

Service

GSM RF

GSM RF

L1bis

L1bis

L1

L1

Gb

Gn

Um

Gi

MS

BSS

SGSN

GGSN

GPRS Transmission Plane

MS

GPRS Overview

basic gprs system architecture1
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

basic gprs system architecture2
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

gprs attach dettach
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

pdp context activation
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

gprs mobile states

Idle

GPRS

Attach

GPRS

Dettach

Ready

Ready timer expiry

or

Force to Standby

PDU Transmission

Standby

GPRS Mobile States

GPRS Overview

gprs mobile class

Mode

Attached to

Support

Class A

Both GPRS and GSM services

Simultaneous

attach • monitor • traffic

Class B

Both GPRS and GSM services

Only operate one set of services at a time

Class C

Either GPRS or GSM services

Alternate use only

GPRS Mobile Class
  • Modes of operation

GPRS Overview

gprs operation

GPRS Attach

makes the MS known in

the corresponding GGSN

Encapsulation & Tunneling

data Packets are equipped with

GPRS-specific protocol information

and transferred between MS and GGSN

BTS

BSC

PCU

SGSN

GGSN

PDNs

Gn

Gb

1. GPRS Attach

2. PDP Activation

3. Data Transfer

Encapsulation & Tunneling

PDP Activation

establishes a logical link

between MS and SGSN

GPRS Operation

GPRS Overview

gprs logical channel
GPRS Logical Channel

Logical Channel

Signaling Channels

Traffic Channels

Packet

Traffic Channel

Packet

Broadcast Control Channel

Packet

Common Control Channel

Downlink

Uplink

PDTCH

PBCCH

PRACH

Downlink

& Uplink

Downlink

PACCH

PPCH

Downlink

PAGCH

Downlink

PNCH

GPRS Overview

packet signaling channels control
Packet Signaling Channels – control
  • Packet Broadcast Control Channel (PBCCH)
    • Broadcasts in the downlink direction packet data System Info’s.
      • If not allocated, the info’s are broadcasted on the BCCH.
  • Packet Common Control Channel (PCCCH)
    • Comprises of the following packet logical channels for common control signaling :
    • PCCCH=PPCH+PRACH+PAGCH+PNCH
  • Packet Paging Channel (PPCH)
    • Used to page a mobile prior to downlink packet transfer.
    • Uses paging groups in order to allow usage of DRX mode.
    • Can be used for paging of both circuit switched and packet data services.

GPRS Overview

packet signaling channels control1
Packet Signaling Channels – control
  • Packet Access Grant Channel (PAGCH)
    • Used in the packet transfer establishment phase (downlink only) to send resource assignment to a mobile prior to packet transfer.
  • Packet Notification Channel (PNCH)
    • Used to send a PTM-M (Point To Multipoint - Multicast) notification to a group of mobiles prior to a PTM-M packet transfer.
  • Packet Random Access Channel (PRACH)
    • Used by the mobile to initiate uplink transfer for sending data or signaling information.
    • Packet access and extended packet access bursts are used on the PRACH.

GPRS Overview

packet traffic channels
Packet Traffic Channels
  • Packet Data Traffic Channel (PDTCH)
    • Allocated for data transfer. In multislot operation, one MS may use multiple PDTCHs in parallel for individual packet transfer.
    • All packet data traffic channels are uni-directional, either uplink (PDTCH/U), for a mobile originated packet transfer or downlink (PDTCH/D) for a mobile terminated packet transfer.
  • Packet Associated Control Channel (PACCH)
    • Conveys signaling information related to a given mobile.
    • Shares resources with PDTCHs that are currently assigned to the mobile.
    • A mobile that is currently involved in packet transfer can be paged for circuit switched services on the PACCH.

GPRS Overview

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