slide gprs.06std

8/8/2019 Slide GPRS.06std

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Trng i hc Bch Khoa H NiTrng i hc Bch Khoa H Ni

KKhoa in t Vin thnghoa in t Vin thng

Thng tin di ngThng tin di ngMobile CommunicationsMobile Communications

TS. Trng TunTS. Trng TunB mn K thut thng tinB mn K thut thng tin

H Ni, 9-2010


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General Packet Radio Service

(GPRS)


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33

General Packet Radio Service

(GPRS)


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GPRS Network ArchitectureGPRS Network Architecture

SMSCMSC/VLR HLRBTS BSC

PacketControl Unit(PCU)

SGSN

SGSN GGSN

ChargingGatewayFunction

Billing

PDN

RF airinterface


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55

GPRS system architecture


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Salient Features of GPRSSalient Features of GPRS

Important step on the path to 3GImportant step on the path to 3G

Standardized by ETSIStandardized by ETSI

GPRS is an overlay network over the GSMGPRS is an overlay network over the GSM

Provides Data Packet delivery serviceProvides Data Packet delivery service

Support for leading internet communication protocolsSupport for leading internet communication protocols

Billing based on volume of data transferredBilling based on volume of data transferred

Utilizes existing GSM authentication and privacyUtilizes existing GSM authentication and privacy

proceduresprocedures..


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Advantage of GPRSAdvantage of GPRS

Use of packetUse of packet--switching technologyswitching technology

Enables multiple users to share air interfaceEnables multiple users to share air interface

resourcesresources

Users feel their services to beUsers feel their services to be always onalways on

GPRS is primarily for data communication andGPRS is primarily for data communication and

not for voice communication.not for voice communication.

GPRS communicates using TCP/IP protocolGPRS communicates using TCP/IP protocol

similar to the internet.similar to the internet.


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GPRSGPRS

Tc truy nhp

Tc truy nhp

t

t

t

Khng truynhp


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ApplicationsApplications

Standard data network protocol basedStandard data network protocol basedIP based applicationsIP based applications WWW, FTP, Telnet, ...WWW, FTP, Telnet, ... Any conventional TCP/IP based applicationsAny conventional TCP/IP based applications

X.25 based applicationsX.25 based applications Packet Assembly/Disassembly (PAD) type approachPacket Assembly/Disassembly (PAD) type approachGPRS specific protocol basedGPRS specific protocol basedPointPoint--toto--point applicationspoint applications

Toll road system, UIC train control systemToll road system, UIC train control systemPointPoint--toto--multipoint applicationsmultipoint applications

Weather info, road traffic info, news, fleet managementWeather info, road traffic info, news, fleet managementSMS delivery (GPRS as a bearer for SMS)SMS delivery (GPRS as a bearer for SMS)


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Mobility Management state model in GPRSMobility Management state model in GPRS


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QoS Profile for GPRS BearersQoS Profile for GPRS Bearers

Describes applications characteristics and QoSDescribes applications characteristics and QoSrequirementsrequirements

4 parameters:4 parameters:

Service precedenceService precedence 3 classes3 classes

Reliability parameterReliability parameter 3 classes3 classes

Delay parametersDelay parameters 4 classes4 classes

Throughput parameterThroughput parameter Maximum and mean bit ratesMaximum and mean bit rates


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QoSQoS Precedence classes (from [GSM 03.60])Precedence classes (from [GSM 03.60])

Reliability classes (from [GSM 02.60])Reliability classes (from [GSM 02.60])

SDU (Service Data Unit)


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Delay classes (from [GSM 02.60])Delay classes (from [GSM 02.60])

Peak throughput classes (from [GSM 03.60])Peak throughput classes (from [GSM 03.60])


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Mean throughput classes (from [GSM 03.60])Mean throughput classes (from [GSM 03.60])


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PDP and PDF contextsPDP and PDF contexts

PDF : Packet Data FlowPDP : Packet Data Protocol

NSAPI : Network layer Service Access Point Identifier


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Channel coding schemes applied per time slotChannel coding schemes applied per time slot

The Packet Data Traffic Channels (PDTCHs) use four different channelcoding schemes, described in [GSM 04.60] to transfer the packet data

traffic. Above table lists the used channel coding schemes and the data

rates that can be obtained by using these coding schemes per time slot.

The maximum data rate that can be obtained on PDTCH channels is

8*21.4 kb/s = 171.2 kb/s

i.e., (8 time slots) * (Maximum data rate for CS-4 for a time slot).


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PDP ContextPDP Context

PDP:PDP: Packet Data Protocol (PDP) is a network protocolPacket Data Protocol (PDP) is a network protocol

used by an external packet data network interfacing toused by an external packet data network interfacing to

GPRS.GPRS.

PDP Context:PDP Context: Information sets held in MS and GSNsInformation sets held in MS and GSNs

for a PDP addressfor a PDP address

NSAPI:NSAPI: Network Service Access Point Identifier. AnNetwork Service Access Point Identifier. An

integer value in the range [0; 15], identifying a certaininteger value in the range [0; 15], identifying a certain

PDP Context.PDP Context.


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PDP Context Activation ProcedurePDP Context Activation Procedure

+ IP assignment+ Roaming


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2020

SIM300SIM300

FeaturesFeatures

Tri or QuadTri or Quad--BandBand GSM/GPRSGSM/GPRS

40x33x2.85mm 6040x33x2.85mm 60--pin ENTERY board to board connectorpin ENTERY board to board connector

Support sleep mode(about 3mA)Support sleep mode(about 3mA)

Embeded TCP/IP protocolEmbeded TCP/IP protocol

AutobaudingAutobauding

Support RTC functionSupport RTC function

OverOver--temperature automatic shutdowntemperature automatic shutdown

Operation temperatureOperation temperature --20~5520~55

Supply voltage 3.4Supply voltage 3.4--4.5V4.5V

Support FAX and USSDSupport FAX and USSD


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2121

SIM508 and SIM548SIM508 and SIM548

FeaturesFeatures

Tri or quadTri or quad--bandband GSM/GPRS+GPSGSM/GPRS+GPS

80PIN CONNECTOR80PIN CONNECTOR

GSM part based on SIM300CGSM part based on SIM300C

GPS receiver with SiRFstar III GSC3f chip setGPS receiver with SiRFstar III GSC3f chip set

Processor type ARM7/TDMIProcessor type ARM7/TDMI

Software version: SiRF GSW3Software version: SiRF GSW3

Two serial GPS interfacesTwo serial GPS interfaces

Size: 55Size: 550.15 x 340.15 x 340.15 x 2.90.15 x 2.90.3 mm0.3 mm


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SIM508 and SIM548SIM508 and SIM548

ApplicationApplication

PND (Personal Navigation Device)PND (Personal Navigation Device)

AVL (Auto Vehicle Location)AVL (Auto Vehicle Location)

TracingTracing

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