cd rom training gprs scenarios

7/31/2019 CD Rom Training GPRS Scenarios

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2 MAR | Re |08/00 |

1 GPRS General Packet Radio Services

GPRS Scenarios

1MAT 08.10.02

GPRSGeneral Packet Radio Services

(Placeholder for a cover picture; this picture should alwayscover the whole slide width as shown here)

GPRS scenarios


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GPRS General Packet Radio Services

GPRS Scenarios

1MAT | 08.10.02 |

Routing

area

GPRS state model

GPRS mobility

management

GPRS sessionmanagement

GPRS network

operation modes

2

Your Lecturer is:

Reiner Stuhlfauth

Rohde&SchwarzTraining Center, Munich


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Structure of presentation

GPRS - Routing area

GPRS - State models inside MS

GPRS - Mobility management

GPRS - Session management

GPRS - Network operation modes

Outline of Presentation


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GPRS-Routing Area

Signalling quantity needed

high

low

Size of Location Areasmall big

Signalling in Uplink direction, mainly

Location Update procedures

Lots of LA-proceduresinitiated by MS

Only a few LA-proceduresinitiated by MS


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GPRS-Routing Area

Signalling needed

high

low


Signalling in Downlink direction,

i.e. Paging calls sent over all

radio cells belonging to that

location area

Paging over a largelocation area

Paging over smalllocation area


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Signalling needed

high

low


Signalling in Uplink direction

GPRS-Routing Area

Signalling in Downlink directionEnvelope curve of uplink and

downlink signalling.The minimum ofsignalling obtained is the desired size

of the location area

Circuit

switched


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Signalling needed

high

low


Signalling in Uplink direction

Signalling in Downlink directionNEW envelope curve of uplink and

downlink signalling.The new minimum ofsignalling obtained is the desired size

of the routing area

Circuit

switched

GPRS-Routing Area

Packet

switched

Size of Routing Area

Packet switched

requires more

paging in DL


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Location Area Identification

MCC MNC LAC

LAI, Location Area Identity

= RACRAI LAI + = LACMNCMCC + + + RAC

RAI, Routing Area Identity

GPRS-Routing Area

MCC = Mobile Country Code MNC = Mobile Network CodeRAC = Routing Area Code LAC = Location Area Code


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GPRS Routing area update procedures

Location Updates in GPRS

Routing Area Update, RAC changes

Cell Identity Update if requested

Periodic Routing Area Update, Timer T3312 expires


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GPRS Routing area update procedures

MS Network

ROUTING AREA UPDATE REQUEST

If P-TMSI or

TMSI allocated,

or Receive N-PDU

Number needed

ROUTING AREA UPDATE ACCEPT

ROUTING AREA UPDATE COMPLETE

Stop T3330

Start T3330

Stop T3350

Start T3350

or

ROUTING AREA UPDATE REJECT

Stop T3330

ROUTING AREA UPDATE REQUESTStart T3330

If P-TMSI or

TMSI allocated,

or Receive N-PDU

Number needed

Routing area update procedure


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GPRS Routing area update proceduresCell update procedure If MS initiated cell re-selection in READY state, cellupdate informs the SGSN about the new serving cell

Cell update is done by transmitting an LLC frameParameter NCO, Network Control Order in SysInfo:MS or network initiated cell reselection

The network may request measurement reports from the MS and control its cellre- selection.

This is indicated by the parameter NETWORK_CONTROL_ORDER.

NC0 Normal MS controlThe MS shall perform autonomous cell re-selection.

NC1 MS control with measurement reportsThe MS shall send measurement reports.

The MS shall perform autonomous cell re-selection.

NC2 Network controlThe MS shall send measurement reports to the network

The MS shall not perform autonomous cell re-selection


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GSM-state model of MS

Initialisation

Initial Cell Selection

GSM IDLE Mode

GSM DEDICATED Mode

IMSI attach

Call setupCall release

IMSI detach

Power onSIM card checkRegister and timer reset

Initial cell selection

Network selectionReading Sysnfo on BCCH

Cell re-selectionNetwork re-selectionListening to paging channelsMS originated call proceduresPerform location update

Rx/Tx activeSend measurement reportObey handover command


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GPRS-state model of MS

GPRS IDLE State

GPRS STANDBY State

GPRS READY State

GPRS attach GPRS detach

READY Timer T3314

expiry

PDU transmission

Initialisation and cell selection


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GPRS IDLE State

MS is not ready for GPRS Services

MS may be switched off

MS of class A or class B may be IMSI attached

MS reads SysInfo to know whether GPRS is supported

If packet data transfer is requested by higher layers,

the MS is initiating the GPRS attach procedure


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GPRS STANDBY State

MS is GPRS attached

MS performs routing area update if necessary

GMM context is established

PDP context may be activated or deactivated

MS listens to paging channels

If higher layers request data transfer, MS starts PDPcontext activation if necessary and TBF establishment


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GPRS READY State

MS is GPRS attached and PDP context is active

MS performs cell update if necessary

MS must be in READY state to transfer data

GPRSREADY State

Packet Idle mode

Packet Transfer mode

Mobility management Radio Resource management


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GPRS Mobility Management

PDU transmission

GPRS Attach

READY timer expiryorForce to STANDBY

GPRS Detach GPRS Attach

PDU reception

GPRS Detachor

Cancel Location

MM State Model of MS MM State Model of SGSN

IDLE

STANDBY

READY

IDLE

STANDBY

READY

READY timer expiryorForce to STANDBYorAbnormal RLC condition

Mobility Management States


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Field

IMSI

MM State

P-TMSI

P-TMSI SignatureIMEI

MSISDN

Routeing Area

Cell Identity

Cell Identity AgeVLR Number

New SGSN Address

Authentication Triplets

KcCKSN

Ciphering algorithmRadio Access Classmark

SGSN Classmark

DRX Parameters

MNRG

NGAFPPFSMS Parameters

Recovery

Radio Priority SMS

Field

IMSI

NSAPI

MSISDN

PDP Type

PDP AddressDynamic Address

APN in Use

QoS Profile Negotiated

SGSN Address

MNRG

Recovery

SNDSNU

Charging Id

Reordering Required

Field SIM

IMSI X

MM StateP-TMSI XP-TMSI Signature XRouteing Area XCell Identity

Kc XCKSN X

Ciphering algorithmClassmark

DRX Parameters

Radio Priority SMS

SGSNMS GGSN

GMM context in 3 network elements: MS, SGSN and GGSN


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MS Network

ATTACH REQUESTStart T3310

ATTACH ACCEPT

ATTACH REJECTStop T3310

Stop T3310

or

ATTACH COMPLETEStop T3350

ATTACH REQUESTStart T3310

If P-TMSI and/orTMSI allocatedStart T3350

If P-TMSI and/orTMSI allocated

GPRS Attach procedure


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GPRS Attach procedure

GPRS Attach is mandatory

Combined GPRS/IMSI attach is possible

Establishes a GMM context

Negociated parameters:

P-TMSI, TMSI, DRX parameters,

READY timer value, Routing Area Identity

Periodic routing area update timer value

MS radio access capabilities, e.g. multislot class

ciphering keys, MS power class, etc.


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MS Network

DETACH REQUESTStart T3321

DETACH ACCEPTStop T3321

or at MS power switch off

DETACH REQUEST

MS initiated detach procedure

GPRS Detach procedure


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GPRS Detach procedure

GPRS detach may be initiated by MS or network

GPRS detach will delete GMM context

There are different causes for GPRS detach:

GPRS detach with switching off,GPRS detach without switching off,

IMSI detach,GPRS/IMSI detach with switching off,

re-attach not requiredre-attach required

IMSI detach after VLR failure


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SIM card shall handle 2

result parameter sets

1 for GSM1 for GPRS

=> problems

with old SIM

cards. MS willstore the values

instead.


RAND

Triplet forIMSI "xyz" ?

RAND

SRESKcSRES

SIM

A3

Ki

RAND

SRES

AUC

A3

Ki

RAND

SRES

MSC

SRES

=

SRES

?

GPRS authentication procedure

GPRS uses the same

algorithm for authentication

that is known from GSM


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GPRS ciphering procedure

The ciphering key Kc is

calculated like

known from GSM.SIM card shall handle 2

result parameter sets

1 for GSM1 for GPRS

=> problems

with old SIM

cards. MS willstore the values

instead.

RA

NDTriplet forIMSI xyz ?

SIM AUC

MSC

Ki

RAND

A8

Kc

Ki

RAND

A8

Kc

Kc

RANDSRES

Kcstore


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INPUT DIRECTION

Kc CIPHER

ALGORITHM

Kc CIPHER

ALGORITHM

PLAIN TEXT PLAIN TEXCIPHERED TEXT CIPHERED TEXT

SGSN/MS MS/SGSN

OUTPUT OUTPUT

INPUT DIRECTION

GPRS ciphering procedure

Kc 64 bits, derived from Kc generation procedure

INPUT 32 bits, LLC frame dependent parameter, set to random initial value

DIRECTION 1 bit, indicates the direction

OUTPUT 1600 octets max.

CIPHER ALGORITHM used ciphering algorithm, A5/x, ordered by network


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GPRS: Session Management

PDP-Address

PDP-Address

GPRS-Network

Application A:Internet

Application B:E-Mail

Identifies PacketData Protocol ofapplication

Packet Data Protocol - Address, PDP-address


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GPRS-Session Management

GGSN associated with:X.121 address

TLLI

X.121 address SAP

IP address SAP

NSAPI-1

NSAPI-2

Gi

GGSN associated with:IP address

Gi

GPRS MS

SGSNIdentifiesApplication on

MS-Side

Identifies

Logical LinkbetweenSGSN and MS

External PDNX.121

External PDNIP

Use of TLLI and NSAPI to transmit Data

Use of TLLI and NSAPI

NSAPI: Network Service Access Point IdentifierTLLI: Temporary Logical Link Identifier


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Deactivate PDP Contextor

MM state change to IDLEActivate PDPContext

INACTIVE

ACTIVE

Packet Data Protocol State


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MS SGSN GGSN

2. SecurityFunctions

1. Activate PDPContext Request

3. Create PDPContext Request

4. Create PDPContext Response

5. Activate PDPContext Accept

- NSAPI- PDP Address- PDP Type- QoS requested

-Access Point Name

- PDP Configuration Options

- determines PDP Address (if dynamic)

- determines external PDN- handles PDP Configuration Options

- may restrict QoS

- add NSAPI, PDP Address,and GGSN Address into

PDP Context- determines

Radio Priority Level

- TID- PDP Address- NSAPI- QoS negotiated

- Radio Priority Level- PDP Configuration

Options

PDP Context Activation Procedure


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MS SGSN GGSN

3. PDU Notification Request

HLR

1. PDP PDU

2. Send Routing Info for GPRS

2. Send Routing Info for GPRS Ack

4. Request PDP Context Activation

5. PDP Context Activation procedure

3. PDU Notification Response

Network oriented PDP-Context Activation Procedure


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PDP-Context Modification

4. Modify PDP Context Accept

2. Update PDP Context Response

1. Update PDP Context Request

3. Modify PDP Context Request

SGSN GGSNMS


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PDP-Context Deactivation Procedure

GGSN

4. Deactivate PDP Context Accept

3. Delete PDP Context Response

3. Delete PDP Context Request

1. Deactivate PDP Context Request

SGSNMS

2. Security Functions


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PDP context in 3 network elements: MS, SGSN and GGSN

Field

PDP Context IdentifierPDP StatePDP Type

PDP AddressAPN SubscribedAPN in UseNSAPITIGGSN Address in UseVPLMN Address Allowed

QoS Profile SubscribedQoS Profile RequestedQoS Profile NegotiatedRadio PrioritySend N-PDU NumberReceive N-PDU NumberSND

SNUCharging IdReordering Required

Field

IMSINSAPIMSISDNPDP Type

PDP AddressDynamic AddressAPN in UseQoS Profile NegotiatedSGSN AddressMNRGRecovery

SNDSNUCharging IdReordering Required

GGSNMS SGSN

Field

PDP TypePDP Address

PDP StateDynamic Address Allowed

APN RequestedNSAPITIQoS Profile Requested

QoS Profile NegotiatedRadio PrioritySend N-PDU NumberReceive N-PDU Number


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GPRS network operation modes

CCU

BSC PCU

HLR

GMSCMSC

SGSN GGSN

PSTN

ISDN

PDN

CCU

CCU

CCU

circuit-switched

packet-switchedBTS

VLR

Responsible for mobilitymanagement and session

management in GPRS

Responsible for mobility

management and call

control in GSM

Gs interface

This interface

is optional!


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GPRS network operation modes

Mode Circuit Paging Channel GPRS Paging Channel Paging co-ordinationPacket Paging Channel Packet Paging Channel

I CCCH Paging Channel CCCH Paging Channel YesPacket Data Channel Not Applicable

II CCCH Paging Channel CCCH Paging Channel NoIII CCCH Paging Channel Packet Paging Channel No

CCCH Paging Channel CCCH Paging Channel

Network operation mode, NOM, in SysInfo givesfurther info about:

paging coordination

combined GMM/MM procedures

Availability of class B MS in Packet Transfer mode


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Thank you for your attention

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?

http://www.rohde-schwarz.comor

[email protected]

Further questions:

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cd rom training gprs scenarios

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