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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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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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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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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