gprs e.pptx
TRANSCRIPT
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What is GPRS?
A new bearer service for GSM thatgreatly improves and simplieswireless access to packet datanetworkse!g to the internet!
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Motivation
Speed
"mmediacy
#ew and better applications
$ser friendly billing
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GSM Architect%re
&'SMS
&'S
&'S
MS
&S(
&S(
MS(
GMS(
MS
)"R
*+R
,+R
A$(
PS'#P-#
"S-#
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GPRS Architect%re
&'S
&'SMS
&S( Gb
SGS#
Gf
GsGr
-)"R
MS(.*+R
,+R
Gc
Gn
GGS#Gi
P-#
Gp GGS#
/ther GPRS
P+M#
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GPRS (/MP/#)#'S
SGSN : (Serving GPRS Support Node))0%ivalent to MS( in GSM
GGSN : (Gateway GPRS SupportNode)
)0%ivalent to GMS( in GSM
PCU : (Packet Coding Unit)1ragmentation of the packets into radioblocks
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GPRS "#')R1A()S
GPRS Core Network : IP basednetwork(1)
Gn interface between 2GS#sGp interface to other GPRS P+M#Gi interface to other PS-# 3 "nternet Wap Gateway )nterprise +A#s4
GPRS ccess NetworkGb interface 3 from SGS# to P($s&ased on 1rame Relay
P($5&S( 3 proprietary interface(alled A5ter A5bis GPRS A5GPRS4678
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GPRS "#')R1A()S
Signa!ing Inter"aces to GS# network(SS$ based) :
Gr interface from SGS# to ,+RGs interface from SGS# to MS(.*+RGd interface from SGS# to GMS(Gc from GGS# to ,+R
Gf from SGS# to )"R4
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Registration of a Mobile
#odeA mobile station m%st register itself
with GPRS network!
GPRS attach
GPRS detach
GPRS detach can be initiated by theMS or the network!
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Session Management
After S%ccessf%l attach a MS gets one ormore Packet -ata Protocol6P-P8
address!'his address is %ni0%e only fora partic%lar session!
"t consists ofP-P type
P-P address assigned to MSRe0%ested 9oSAddress of the corresponding GGS#
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Session
Management6(ontd!8P-P5Address allocation3
Static3Assigned by network
operator of $ser:s home P+M#!
-ynamic3Assigned by(orresponding GGS#!
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P-P (onte2t Activation
MS SGS# GGS#Activate P-P (onte2tRe0%est
Sec%rity 1%nctions
Activate P-P (onte2t Accept
(reate P-P (onte2t Re0%est
(reate P-P (onte2tResponse
P-P typeP-P Address
9oS Re0%estedAccess Point4
P-P typeP-P Address9oS #egotiatedAccess Point4
P-P type9oS #egotiated4P-P typeP-P Address9oS #egotiated4
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+ocation Management
MS fre0%ently sends location%pdate messages to inform the
SGS# where it is!-etermining fre0%ency of %pdate
messages is non5trivial!
'he location %pdate fre0%ency isdependent on the state of the MS!
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%rans&ission P!ane
'he protocols providetransmission of %ser data
and its associated signalling Signa!!ing P!ane
(omprises protocols for the
control and s%pport off%nctions of the transmissionplane
Protocol Architecht%re
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GPRS +ogical (hannels
Gro%p (hannel 1%nction -irection
Packet data'ra;c channel
P-'(, -ata 'ra;c MS &SS
Packet broadcastcontrol channel
P&((, &roadcast (ontrol MS &SS
Packet common(ontrol (hannel6P(((,8
PRA(,
PAG(,
PP(,
P#(,
Random Access
Access Grant
Paging
#otication
MS &SS
MS &SS
MS &SS
MS &SS
Packet -edicated(ontrol (hannels
PA((,
P'((,
Associated (ontrol
'iming Advance (ontrol
MS &SS
MS &SS
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$plink -ata 'ransferMS BSSPRACH or RACH
PAGCH or AGCH
Random Access
Transmission
Packet channel Request
PACCH
PACCH
PDTCH
PACCH
PDTCH
PACCH
Packet Immediate assignment
Packet resource Request
Packet resource assignment
Frame Transmission
egati!e Ackno"ledgement
Retransmission o# $locks in error
Ackno"ledgement
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-ownlink -ata 'ransfer
PRACH or RACH
PAGCH or AGCH
Paging
Transmission
Packet channel Request
PACCH
PACCH or PAGCH
PDTCH
PACCH
PDTCH
PACCH
Packet Immediate assignmentPacket %aging res%onse
Packet resource assignment
Frame Transmission
egati!e Ackno"ledgement
Retransmission o# $locks in error
Ackno"ledgement
Packet %aging requestPPCH or PCH
MS BSS
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M%lti Slot /peration
GPRS allows a mobile to transmit datain %p to < P-(,s 6eight5slot operation8
=5bit $S1 at beginning of each radioblock in downlink points to ne2t %plinkradio block
(omparison with single5slot GSM ,igher delay at higher load
+ow blocking rate
"mproved 'hro%ghp%t
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