mech gprs ppt

7/24/2019 Mech GPRS Ppt

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SeminarOn

GPRS


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Outline

IntroductionGPRS Applications

GPRS normal service procedures

GPRS ArchitectureGPRS protocol layering

GPRS data link layer and coding schemes

GPRS packet transferLimitations of GPRS


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Introduction

The General Packet Radio System (GPRS) is a new service that

provides actual packet radio access for mobile Global System forMobile Communications (GSM) and timedivision multiple access(T!M") users#

The main benefits of GPRS are that it reserves radio resources onlywhen there is data to send and it reduces reliance on traditional

circuitswitched network elements#Theoretical up to $%$#& kbps transmission speed are achievable usin' all ei'ht timeslots at the same time#o dialup connection is necessary GPRS facilitates instant

connections whereby information can be sent or received immediately as the need arises#GPRS facilitates several new applications that have not previously been available over GSM networks due to the limitations in speed and messa'e len'th#GPRS fully enables Mobile *nternet functionality by allowin'

interworkin' between the e+istin' *nternet and the new GPRS network#


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GPRS applicationsCommunications

,se the mobile communications network purely as a pipe to access messa'esor information#

- .mail/ fa+/ unified messa'in'/ intranet0*nternet accessValue-added services VAS! Refer strictly to content provided by network operators to increase the

value of their service to their subscribers# - .commerce/ bankin'/ financial tradin'/ Retail/ ticket purchasin'/Location-"ased applications

Provide the ability to link push or pull information services with a user1s location# - avi'ation/ traffic conditions/ airline0rail schedules/ location finder

Vertical applications "pply to systems utili2in' mobile architectures to support the

carryin' out of specific tasks within the value chain of a company# - 3rei'ht delivery/ fleet mana'ement/ salesforce automationAdvertising


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GPRS normal service procedure

Provision

- GPRS services4 Point To Point (PTP) and Point To Multipoint (PTM)#- 5uality of Service (5oS)4

$) priority/ &) reliability/ 6) delay/ 7) user data throu'hput/8) scheduled repeated transmission.

#ithdra$al

GPRS-Attach and GPRS-%etach - "ttach4 MS indicates its presence to the P9M (public mobile network)for the purpose of usin' the GPRS services#

-!etach4 MS indicates to the P9M that the MS will no lon'er be usin' the GPRS servicesRegistration

:y re'isterin'the service parameters the subscriber optimi2es the theits present dynamic service profile within the limitations of the staticsubscription profile.

&rasure The subscriber erasespreviously re'istered service parameter values

from the service profile#


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GPRS normal service procedureInterrogation

The subscriber interro'atesthe status0value of re'istered serviceparameters as defined in the current service profile#Activation The subscriber activateseach of the re'istered interworkin' profiles

independently within the limitations of the subscription profile#

%e-activation The subscriber deactivatesthe previously activated interworkin'profiles independently within the limitations of the subscription profile#

Invocation and operationThe GPRS service is invokedupon transmission or reception of GPRS

data by subscribers#

PI' and Pass$ord (anagement - Correct subscriber identification has been confirmed by entry of the

current GSM P*when GPRS"ttach operates# - GPRS services is offered to a subscriber with the subscription option of

usin' a passwordto control the services#


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GPRS reference arcitectureGPRS can "e thought of as an overlay net$orkonto a GS( net$ork)


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GPRS elements

'e$ terminals mo"iles!*- Re;uired to handle the enhanced air interface and packeti2e traffic#

- " GPRS terminal can be one of three classes4 " : or C#+SC,+S*

- :SC is re;uired to provide a physical and lo'ical data interface out ofthe base station subsystem (:SS) for packet data traffic#

GPRS 'et$ork*- Gateway GPRS Service ode (GGS)performs mobility mana'ement

functions such as mobile subscriber attach0detach and locationmana'ement# - Servin' GPRS Service ode (SGS)are interfaces to e+ternal *P

networks such as the public *nternet other mobile service providers1GPRS services or enterprise intranets#GPRS (o"ility (anagement* Mobility mana'ement builds on the mechanisms used in GSM networks# -


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9GPRS protocol layering

Transmission plane protocol layering


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he transmission plane covers the protocols for user information

transmission and associated control procedures)

+et$een SGS' and GGS' . GPRS tunnel protocol(GTP)

+et$een the SGS' and (S . Subnetwork !ependent Conver'ence Protocol(S!CP) - :SS GPRS protocol(:SSGP)

+et$een (S and +SS

- Physical 9ink sublayer(P99) - Physical R3 sublayer(R39) - Radio 9ink Control(R9C) - Medium "ccess Control(R9C0M"C)

GPRS protocol layering

Transmission plane protocol layering


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11GPRS protocol layering

Signaling plane protocol layeringGPRS-specific mo"ility management protocolG((!is re/uired

$ithin (S and SGS' to support the mo"ility functionality)


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Logical link control LLC!- Provides a lo'ical link between the MS and SGS#- 99C layerprotocol functionality is based on link access

procedure! (9"P!)#

Radio link control,medium access control RLC,(AC! - Provides services for information transfer over the physical

layer of the GPRS radio interface# - R9C layeris responsible for the transmission of data block

across the air interface and the backward error correction(:.C) procedures#

- M"C layeris derived from a slotted "9>


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GPRS pac!et transformation data flow

P< ,ser data etwork layer

S!CP layer

Packet (P!,)

Se'ment Se'ment?

3< *nfo 3SC

Se'ment Se'ment?

:< *nfo :CS Tail

Convolutional encodin'

:urst :urst :urst :urst

99C frame

R9C0M"C block

ormalburst

S!CP layer99C layer

99C layerR9C0M"C layer

R9C0M"C layerPhysical layer

P


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GPRS R"#$% bloc! structure

, S 3, s e r! a t a

T P C R 9 C

h e a d e r R 9 C d a t a : C S

P a y l o a d

M " C h e a d e r R 9 C d a t a

b l o c k: l o c k

c h e c ks e ; u e n c e

, S 3C o n t r o l T P C R 9 C 0 M " C s i ' n a l i n ' i n f o r m a t i o n : C S

P a y l o a d

M " C h e a d e r R 9 C 0 M " C c o n t r o l

b l o c k: l o c kc h e c k

s e ; u e n c e


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GPRS coding scemes

Ma+imal data rate A B&$#7 A $%$#&Dbpsper user

SchemeCoderate

Payload +CSPre-coded

0S1ail"its

Coded"its

Punct)"its

%ata ratek",s!

SC$ $0& $B$ 7E 6 7 78@ E F#E8

SC& &06 &@B $@ @ 7 8BB $6& $6#7

SC6 607 6$& $@ @ 7 @%@ &&E $8#@

SC7 $ 7&B $@ $& E 78@ E &$#7


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GPRS logical cannels'P(#)

Packet +roadcast Control Channel P+CC2!Packet :roadcast Control Channel (P:CC


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%obile'Originated pac!et transfer

etworkMSPacket channel re;uest

Randomaccess

Time

Packet immediate assi'nment

Packet resource assi'nment

Packet resource re;uest

Transmission

R9C0M"C data

"cknowled'ement

"cknowled'ement

Retransmission of data in error

PR"C


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%obile'Terminated pac!et transferetworkMS

Packet pa'in' re;uest

Randomaccess

Time

Packet channel re;uest

Packet resource assi'nment

Packet pa'in' response

Transmission

3rame transmission

"cknowled'ement

"cknowled'ement

Retransmission of blocks in error

PPC


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Trougput *S. Input load in GPRS

P R S c u r v e

I n p u t l o a d

Trougput

The throu'hput of the GPRS system performs as a slotted "9>


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"imitation of GPRSLimited cell capacity for all users

There are only limited radio resources that can be deployed for bothvoice and GPRS calls#Speeds much lo$er in reality *t is unlikely that a network operator will allow all timeslots to be

used by a sin'le GPRS user#Support of GPRS mo"ile terminate "y terminals is no ensured There has been no confirmation from any handset vendors that mobile terminated GPRS calls)ransit delays GPRS packets are sent in all different directions to reach the same destination# the result is that potential transit delays can occur#

'o store and for$ard There is no stora'e mechanism incorporated into the GPRS standardapart from the incorporation of interconnection links between SMS andGPRS#

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Refrences

www.google.com

www.wikipedia.org

www.studymafia.org

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mech gprs ppt

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