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Foreword
GPRS principle is the basic part of the whole GPRS system
and the succeeding products learning.
This slide will help us to understand the GPRS system
networking and wireless subsystem etc.
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References
GPRS principle
31!"#$% & '$('1% P)* Technical 'anual
GPRS protocol
3#
+#+
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)ontents
1. GPRS System Overview
!. GPRS ireless Subsystem
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GS' 2eelopment 4olution
3 G 384 Kb/sUMTS
2.75 G ECS EGPRS EGE38.8 Kb/s 5!.2 Kb/s
2.5 G "SCS GPRS14.4 Kb/s 21.4 Kb/s
CS
2 G GSM !.# Kb/s PS
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hat is GPRS and 42G45
6bbreiation of General Packet Radio Serice. GPRS
is an end&to&end packet switching technology
proided on the basis of GS' technology. 7t has much
interactie serices with the e8isting GS' circuit
switching system.
GPRS supports wireless access rate of up to 191.!bps.
42G4 :Enhanced $t$ Rates for GSM Eolution;
4GPRS :Enhanced GPRS;
4GPRS supports wireless access rate of up to +93.#bps. 4)S2
:Enhanced CS/ 4nhanced <S)S2&<igh Speed )ircuit
Switched 2ata;
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GPRS=42G4 )oding Rate
Kb%s5!.2
#&.&&54.4
5&.&& GPRS 44.8
EGPRS4&.&&
2!.#3&.&&
22.421.4
17.#2&.&&15.# 14.8
13.411.2
!.&5 8.81&.&&
&.&&CS'1 CS'2 CS'3 CS'4 MCS'1 MCS'2 MCS'3 MCS'4 MCS'5 MCS'# MCS'7 MCS'8 MCS'!
GMSK 8PSK
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6d-ustments to GS' >etwork
( CS C)re*SS +etw)r,Pb
PCU
Gs
PS C)reGb+etw)r,
*SS +SS
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'odifications in ?SS :GS' 4olesinto GPRS;
U%-r$e *TS U%-r$e *SC ( ew PCUs)0tw$re s)0tw$re
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'odifications in ?SS :GPRS 4olesinto 42G4;
E
TR
U%-r$e *TS U%-r$e *SC U%-r$e PCUs)0tw$re $ s)0tw$re s)0tw$re
$rw$re
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GPRS 'S
)lass 6
The 'S is attached to both GPRS and other GS' serices and the
'S supports simultaneous operation of GPRS and other GS'
serices.
)lass ?
The 'S is attached on GPRS network and GS' network
simultaneously but not enabling circuit switching and packet switching
serices at the same time.
serices are selected automatically.
)lass )
The 'S is attached to either GPRS or other GS' serices. 6lternate
use only.
serices are selected manually or default selected serice.
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)ontents
1. GPRS System ,eriew 2.
GPRS ireess Sbsystem
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Packet @ogic )hannels
P$,et 6)-i C$e
P$,et servie $e P$,et )tr) $e
P*CC" PCCC" PCC"*CC"
PTC"/U PTC"/ P(CC"PPC" PR(C" P(GC" P+C" TC"
PC" R(C" (GC"+C" PTCC"/U PTCC"/
S(CC"
The specific type of P2)< :e8cept PR6)<; is determined by
R@)('6) head and R@)('6) control message type.
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)hannel 6bbreiation
Packet 2ata Traffic )<annel *plink & P2T)<(*
Packet 2ata Traffic )<annel 2ownlink & P2T)<(2
Packet ?roadcast )ontrol )<annel & P?))<
Packet )ommon )ontrol )<annel & P)))<
Packet 2edicated )ontrol )hannel & P2))<Packet Paging )<annel & PP)<
Packet Random 6ccess )<annel & PR6)< Packet 6ccess
Grant )<annel & P6G)< Packet >otification )<annel &
P>)< Packet 6ssociated )ontrol )<annel & P6))<
Packet Timing adance )ontrol )<annel *plink & PT))<(*
Packet Timing adance )ontrol )<annel 2ownlink &
PT))<(2
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P2T)< :Packet 2ata Traffic )<annel;
6ll packet data traffic channels are
uni&directional.
P$,et servie $e
*plink :P2T)<(*; for a mobile
originated packet transfer.
PTC"/U PTC"/2ownlink :P2T)<(2; for a mobile
terminated packet transfer.
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P?))< :Packet ?roadcast )ontrol)<annel;
The P?))< broadcasts parameters used
by the 'S to access the network for
packet transmission operation. P$,et )tr) $e
The P?))< also carries the information
transmitted ia the ?))< to allow circuitP*CC"
switching operation.
The 'S in GPRS attached mode monitors
the P?))< only/ if P?))< is aailable/
otherwise/ the ?))< shall be used to
broadcast information for packet operation.
The e8istence of the P?))< in the cell is
indicated on the ?))< ia S713.
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P)))< :Packet )ommon )ontrol)<annel;
PP)<
2ownlink only/ used to page 'S.
PR6)<
*plink only/ used to reAuest allocation of one or PCCC"seeral P2T)<(*s or P2T)<(2s.
P6G)<
2ownlink only/ used to allocate one or seeral
P2T)<s.
PPC" PR(C" P(GC" P+C"P>)<
2ownlink only/ used to notify 'S of PT'&' call.
7f no P)))< is allocated/ the information forpacket switching operation is transmitted on the
)))<. 7f a P)))< is allocated/ it may transmit
information for circuit switching operation.
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P2))< :Packet 2edicated )ontrol)hannels;
P6))<PCC"
?i&directional/ used to transmit the packet
signaling in data transmission.
PT))<(* P(CC"
*sed to transmit random access bursts to
PTCC"/U PTCC"/allow estimation of the timing adance for
one 'S in packet transfer mode.
PT))<(2
*sed to transmit timing adance updates for
seeral 'S. ,ne PT))<(2 is paired with
seeral PT))<(*Bs.
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)ombinations of Packet @ogic)hannel
'ode 10 P?))<CP)))<CP2T)<CP6))<CPT))<'ode !0 P)))<CP2T)<CP6))<CPT))<
ith the increase of traffic/ thepacket public channel should be
configured in the cell. )hannel
combination mode 1 and mode !
should be adopted.'ode 30 P2T)<CP6))<CPT))<
7n case of small GPRS traffic/ GPRS andcircuit serices share the same
'ode +0 P?))<CP)))< ?))< and )))< in the cell. 7n this
case/ only combination mode 3 is
needed in the cell.:P)))<DPP)<CPR6)<CP6G)<CP>)< )
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Packet ireless )hannel)onfigurations
Reason of adopting static P2)<
To enable that GPRS 'S is constantly online in the cell.
To ensure certain EoS of GPRS serices.
Reason of adopting dynamic P2)<
GPRS and GS' share wireless resources.
ireless resources should be adopted in priority on the other hand/
EoS of oice serices should be ensured.
7n a cell/ the percentage of packet switching serices and the
percentage of circuit switching serices are constantly changing.2ynamic P2)< is not isible for oice serices.
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Packet ireless )hannel)onfigurations
Geer$ %rii%es
The cell should be configured with static P2)< to enable 'S to be
normally attached on GPRS network as well as certain EoS of GPRS
serices.
2ynamic P2)< should be configured according to the GPRS traffic
forecast/ which should be ad-usted as T)< or P2)< usable in the
operation process according to the cell traffic status. )ircuit switching
serices can seie the channel used by GPRS serices.
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6llocation of ireless PacketResources
TS & ? ?1 ?! ?3 ?+ ?" ?# ?9 ?% ?$ ?1 ?1
1
TS 1 ? ?1 ?! ?3 ?+ ?" ?# ?9 ?% ?$ ?1 ?1
1
TS 2 ? ?1 ?! ?3 ?+ ?" ?# ?9 ?% ?$ ?1 ?11
MS1 MS2 MS3
ireless resource allocation and wireless transmission adopt the wireless block
:?@,); as the basic unit.
4ach P2)< can be used by seeral 'Ss each 'S can use multiple P2)<s at the
same time.
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?asic )onceptions about Radio ?lock
T?F :Temporary ?lock Flow;
6 Temporary ?lock Flow :T?F; is a physical connection used by the
two RR entities( the RR entity of the 'S and that of the ?SS) to
support the unidirectional transfer of @@) P2*s on packet data
physical channels.
6 T?F is temporary and is maintained only for the duration of the data
transfer.
TF7 :Temporary Flow 7dentity;
4ach T?F is assigned a Temporary Flow 7dentity :TF7; by the network.
The TF7 field is fie bits in length.
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'edium 6ccess 'odes
*plink resource allocation mode
2ynamic allocation :supported by all 'Ss and all networks;
The mobile station detecting an assigned *SF alue for each assigned P2)< and block
or group of four blocks that it is allowed to transmit on that P2)<.
Fi8ed allocation :supported by all 'Ss and all networks;Fi8ed bit mapping is adopted to determine the allocated blocks in the allocation period
without an assigned *SF.
48tended dynamic allocation :optional for the network;
The mobile station detecting an assigned *SF alue for any assigned P2)< allowing the
mobile station to transmit on that P2)< and all higher numbered assigned P2)<s in the
same block or group of four blocks.
2ownlink resource allocation mode
2ynamic allocation and fi8ed allocation.
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'S 'ulti&TS 6bility
)oncept of 'S multi&TS ability
Types
Type 10 >on&simultaneous TRH
Type !0 Simultaneous TRH
the multi&TS ability leel is 1&!$ the bigger the leel/ the stronger the
multi&TS ability.
1I1! :Type 1;/up to + timeslots in any direction
13I1% :Type !;/ranges between 3I% timeslots
1$I!$ :Type 1;
?SS allocates resources according to the 'S multi&TS ability/
reAuested EoS and current resource configuration.
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>etwork )ontrol 'odes
2uring the network controlled cell re&selection/ the network
may reAuest measurement reports from the 'S and control
its cell re&selection. <ence/ three types of mode are defined
as follows0
>)0 >ormal 'S controls
>)10 'S control with measurement reports
>)!0 >etwork control
The network subsystem must support >) and should
gradually support >)1 and >)!.
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>etwork )ontrol 'odes
'S >) 'S >)1
The 'S shall send
measurement reports
to the network
The 'S shall perform autonomous cell re&selectionThe 'S shall perform autonomous cell re&selection
>)!
'RThe 'S shall not
?TS'S perform autonomous cell
re&selection)ell re&selection
command
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'' State
G'' conte8t is not established 'S is not reachable.
6E 2ata transmission to and from the mobile subscriber as well as the paging of
the subscriber are not possible
G'' conte8t is established 'S can receie paging butST(+*9 cannot implement data transmission.
The location information in the SGS> '' conte8t contains only the GPRS R67.
Pages for data or signalling information transfers may be receied. 7t is also possible
to receie pages for the )S serices ia the SGS>. 2ata reception and transmission
are not possible in this state.
'S can implement data transmission.
RE(9 The 'S performs '' procedures to proide the network with the actual
selected cell.
SGS> performs the '' on cell leel.
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)ompare with GS'
GPRS(42G4 GS'
72@4 Power off
ST6>2?J 72@4
System know the 'S in which R6 System know the 'S in which @6
R462J 2427)6T42 ',24
System know the 'S in which cell System know the 'S in which cell
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