1 OMQ000001 GPRS Principle(Um Interface) ISSUE2

7/25/2019 1 OMQ000001 GPRS Principle(Um Interface) ISSUE2

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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




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.




)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.




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>)< ）




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.




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 >)!.




>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.




)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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1 OMQ000001 GPRS Principle(Um Interface) ISSUE2

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