1. Owb000001 Gprs Principle Issue3.0

7/27/2019 1. Owb000001 Gprs Principle Issue3.0

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Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.

GPRS Principle


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Page2Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.

Foreword GPRS principle is the basic part of the whole system and

the later products learning. This slide will help us tounderstand the GPRS system networking and some

important procedure.


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References 3GPP protocol 23060

3GPP protocol 29060

3GPP protocol 24008


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Objectives Upon completion of this course, you will be able to:

Describe the GPRS networking structure

Describe the GPRS mobility management procedure

Describe the GPRS session management procedure


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Contents1. GPRS Network Structure

2. Mobility Management

3. Radio Resource Management

4. Session Management


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GPRS Network Structure What is GPRS?

General Packet Radio Service

What is the function of GPRS?

In order to provide the data service out the scope of the fixed network

GPRS network classification

GSM GPRS

UMTS GPRS

GPRS network background

GSM GPRS network reuse the existed GSM network

UMTS GPRS network just change the RAN side


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GPRS Network Structure

FR

EIREIRHLRHLRSMS-GMSCSMS-IWMSC

SMS-GMSCSMS-IWMSC

MSC/VLRMSC/VLR

BSSBSS

UTRANUTRAN

SGSNSGSN

SGSNSGSN

GGSNGGSN

BGBG

CGCG

TETEPDN

SS7

ATM

DDN

ISDN

Ethernet.etc

GPRSBackbone

Gs Gd Gr Gf Gc

Gb

Iu

Um

Um

Gp

Gi

Gn

Gn

ATMGa

SCPSCP GMLCGMLC

Ge Lg

Ga


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GPRS Network Structure Some Abbreviation

GPRS: General Packet Radio Service

BSS: Base Station Subsystem

UTRAN: UMTS Terrestrial Radio Access Network

SGSN: Service GPRS Support Node

GGSN: Gateway GPRS Support Node

CG: Charging Gateway

BG: Border Gateway

PDN: Packet Data Network


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GPRS Network Structure Abbreviations:

MSC/VLR: Mobile Switch Center/Visitor Location Register

SMS-GMSC: Gateway MSC For Short Message Service

SMS-IWMSC: Short Message Service Interworking MSC

SCP: Service Control Point

GMLC: Gateway Mobile Location Center

HLR: Home Location Register

EIR: Equipment Identity Register


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GPRS Network Structure Important Entity Function: SGSN

Mobility management

The MM functions are used to keep track of the current location ofan MS within the PLMN or within another PLMN.

Session management

SM function manages the PDP context of MS.

Routing and transfer SGSN performs routing and forwarding of service data between

MS and GGSN.

Charging

SGSN can generate, store, convert and send CDRs. Lawful Interception

NTP


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GPRS Network Structure Important Entity Function : GGSN

Session management

SM function manages the PDP context of MS.

Routing and transfer

GGSN performs routing and forwarding of service data between MS and

internet.

Charging

GGSN can generate, store, convert and send CDRs.

Dynamic IP allocation Service management

Manage APN


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GPRS Network Structure Important Entity Function: CG

Real-time collection of GPRS CDRs

Temporary storage and buffering of GPRS CDRs

Pre-processing of GPRS CDRs

Sending GPRS CDRs to the billing center


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GPRS Network Structure Important Entity

Function: DNS

SGSN GGSN(A)

MS

BSS

GPRS backboneGPRS backboneGPRS backboneISP AISP AISP A

ISP BISP BISP B

Internet/

IntranetGGSN(B)DNS

Resolve the APN to a GGSN IP in the PDP active procedure

Resolve the RAI to a SGSN IP in the inter-SGSN RAU procedure

Resolve the RNCID to a SGSN IP in the relocation procedure(UMTS)


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GPRS Network Structure Important Entity Function: HLR/AUC

Saving and updating GPRS subscriber subscription data User authentication

Providing location information and processing needed in

mobility management and routing, for example

Saving and updating user service SGSN number and address

GPRS user location deletion indication

Whether MS is reachable


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Typical Application E-mail from mobile to fixed network

BTS/NodeB

SGSN

MS

BSC/RNC

GGSNBackboneBackbone

ISPISP

Accessserver

Mailserver

e-mail

HLR

3322

11


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Typical Application E-mail from fixed to mobile network

BTS/NodeB

SGSN

MS

BSC/RNC

GGSNBackboneBackbone

ISPISP

Accessserver

Mailserver

e-mail

HLR

11

22

33


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Summary GPRS network provides data service to the mobile

subscribers.

GPRS network is composed of SGSN, GGSN and CG. BG

and DNS provide special function during the data service.


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Contents1. GPRS Network Structure





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Contents2. Mobility Management

2.1 Basic concepts2.2 Attach and Detach

2.3 Security Function

2.4 Location Management


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GMM (GPRS Mobility Management) Function of the Mobility Management

keep track of the current location of an MS within the PLMN orwithin another PLMN

Subscription data management

MS states management


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GMM (GPRS Mobility Management) GMM main procedures

Attach procedure

RAU and periodic procedure

Detach procedure

GMM other procedures P-TMSI reallocation procedure

Authentication procedure

Identification procedure

Subscriber management procedure


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GMM States

PDU transmission

Implicit Detach

or

Cancel Location

GPRS Attach

READY timer expiry

or

Force to STANDBY

GPRS Detach GPRS Attach

PDU reception

GPRS Detach

or

Cancel Location

MM State Model of MS MM State Model of SGSN

IDLE

READY

STANDBY

IDLE

READY

STANDBY

READY timer expiry

or

Force to STANDBY

or

Abnormal RLC condition


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PMM (Packet Mobility Management) The function of PMM is similar to GMM.

PMM other procedures

P-TMSI reallocation

Authentication

Identification

Subscriber management

PMM main procedures

Attach

RAU and periodic RAU

Detach

Service request

SRNS relocation


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PMM StatesPMM-

DETACHED

PS Attach

PS SignallingConnection Release

PS SignallingConnection Establish

PS D etach

PMM-CONNECTEDPMM-IDLE

Detach,PS At tach R eject,RAU Reject

PMM-DETACHED

PS D etach

PMM-CONNECTED

Serving RNCrelocation

3G-SGSN MM StatesMS MM States

SM-ACTIVE orINACTIVE SM -ACTIVE orINACTIVE SM-ACTIVE orINACTIVE SM -ACTIVE orINACTIVE

Detach,PS Attach Reject,RAU R ejectPS Attach

PS SignallingConnection Establish

PS SignallingConnection Release

PMM-IDLE


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Mobility Management Timer Functions

READY Timer Function (GSM only)

The READY timer controls the time an MS remains in READY

state in the MS and the SGSN. When the READY timer expires,the MS and SGSN MM contexts shall return to STANDBY state.

Periodic RA Update Timer Function

Upon expiry of the periodic RA update timer, the MS shall start a

periodic routeing area update procedure.

Mobile Reachable Timer Function

If the mobile reachable timer expires, the SGSN shall clear PPF.

After expiry of the mobile reachable timer the SGSN may

perform an implicit detach.


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MS Operation Modes for GSM Class-A mode of operation: The MS is attached to both

GPRS and other GSM services, and the MS supports

simultaneous operation of GPRS and other GSM services.

Class-B mode of operation: The MS is attached to both

GPRS and other GSM services, but the MS can onlyoperate one set of services at a time.

Class-C mode of operation: The MS is exclusively attached

to GPRS services.


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UE Operation Modes for UMTS PS/CS mode of operation: The MS is attached to both the PS

domain and CS domain, and the MS is capable of simultaneously

operating PS services and CS services.

PS mode of operation: The MS is attached to the PS domain

only and may only operate services of the PS domain. However,

this does not prevent CS-like services to be offered over the PS

domain (e.g. VoIP).

CS mode of operation: The MS is attached to the CS domain

only and may only operate services of the CS domain. However,

this does not prevent PS-like service to be offered over the CS

domain.


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Contents2. Mobility Management

2.1 Basic concepts

2.2 Attach and Detach




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Attach Procedure Function

An MS/UE shall perform a GPRS Attach to the SGSN in order

to obtain access to the GPRS services.

If the MS/UE is connected via a GSM radio, it shall perform a

GSM GPRS Attach procedure. If the MS/UE is connected via a UMTS radio access network, it

shall perform a UMTS GPRS Attach procedure


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Attach Procedure

(IMSI or PTMSI+RAI) (PTMSI)

(IMSI)

(Identity Type = IMSI)

(IMSI)


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Attach Procedure


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Attach Procedure Results after any attach procedure:

SGSN get subscriber data from HLR

HLR recorded the MSs serving SGSN number

SGSN and MS create MM context for the MS

MS can request Session Management services


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MM Context

X1)Currently used Iu mode ciphering key.CK

XXSelected ciphering algorithm (GEA).Ciphering algorithm

2)XCiphering key sequence number of Kc.CKSN

2)XCurrently used A/Gb mode ciphering key.Kc

XXAuthentication and ciphering parameters (authentication triplets or quintets).Authentication Vectors

XXThe IP address of the new SGSN where buffered and not sent N-PDUs should be

forwarded to.

New SGSN Address

XXThe VLR number of the MSC/VLR currently serving this MS.VLR Number

XTime elapsed since the last SAC was received at the 3G-SGSN.Service Area Code Age

XLast known SAC when initial UE message was received or Location Reportingprocedure was executed.

Service Area Code

XTime elapsed since the last LLC PDU was received from the MS at the SGSN.Cell Identity Age

XCurrent cell in READY state, last known cell in STANDBY or IDLE state.Cell Identity

XXCurrent routeing area.Routeing Area

XXThe basic MSISDN of the MS.MSISDN

XXInternational Mobile Equipment IdentityIMEI

XXA signature used for identification checking purposes.P-TMSI Signature

XXPacket Temporary Mobile Subscriber Identity.P-TMSI

XXMobility management state, IDLE, STANDBY, READY, PMM-DETACHED, PMM-IDLE,or PMM-CONNECTED.

MM State

XXIMSI is the main reference key.IMSI

Iu modeA/Gbmode

DescriptionField


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MM Context

XThe RLC/MAC radio priority level for uplink SMS transmission.Radio Priority SMS

XXIndicates that the status of the operator determined barring for packet orientedservices.

ODB for PS parameters

XXOptional GPRS CAMEL subscription information, see 3GPP TS 23.016GPRS-CSI

XXIndicates if HLR or VLR is performing database recovery.Recovery

XXSMS-related parameters, e.g. operator-determined barring.SMS Parameters

XXThe charging characteristics for the MS, e.g. normal, prepaid, flat-rate, and/orhot billing subscription.

Subscribed ChargingCharacteristics

XXIndicates whether paging for PS and CS services can be initiated.PPF

XXIndicates whether activity from the MS shall be reported to the MSC/VLR.NGAF

XXIndicates whether activity from the MS shall be reported to the HLR.MNRG

XXDiscontinuous reception parameters.DRX Parameters

XXMS network capabilities.MS Network Capability

XMS radio access capabilities.MS Radio Access Capability

X1)Key Set Identifier.KSI

X1)Currently used Iu mode integrity key.IK

The information marked with a "1)" may be maintained if authentication is performed by the UMTSauthentication procedure.

The information marked with a "2)" may be maintained if authentication is performed by the GSMauthentication procedure.


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Detach Procedure Function

The GPRS Detach procedure allows an MS to inform the network that

it does not want to access the SGSN-based services any longer

The GPRS Detach procedure allows the network to inform an MS that

it does not have access to the SGSN-based services any more

The following three entity can initiate the detach procedure

MS

SGSN

HLR


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Detach Procedure Results after any Detach procedure:

The SGSN shall not service the detached MS, unless reattach

The MS is in idle or PMM-DETACHED state

The MS is detached either explicitly or implicitly:

Explicit detach: The network or the MS explicitly requests detach

Implicit detach: The network detaches the MS, without notifying the

MS, a configuration-dependent time after the mobile reachable timer

expired, or after an irrecoverable radio error causes disconnection of

the logical link.


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Detach Types The different types of detach are:

IMSI detach;

GPRS detach; combined GPRS / IMSI detach (MS-initiated only).

The MS can make an IMSI detach in one of two ways depending on

whether it is GPRS-attached or not:

A GPRS-attached MS sends a Detach Request message to the SGSN,

indicating an IMSI detach. This can be made in combination with GPRS detach.

An MS that is not GPRS-attached makes the IMSI detach as already defined in

A/Gb mode or UMTS.


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Detach Procedure (MS Initiated)

3. IMSI Detach Indication

2. Delete PDP Context Response

1. Detach Request

2. Delete PDP Context Request

5. Detach Accept

MS BSS/UTRAN GGSNSGSN MSC/VLR

4. GPRS Detach Indication

6. PS Signalling Connection Release

C2

C1


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Detach Procedure (SGSN Initiated)


1. Detach Request2. Delete PDP Context Request

4. Detach Accept

MS BSS/UTRAN GGSNSGSN MSC/VLR



C1

C2


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Detach Procedure (HLR Initiated) HLRMS BSS/UTRAN GGSNSGSN MSC/VLR


1. Cancel Location


2. Detach Request

6. Cancel Location Ack


5. Detach Accept


C2

C1


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Purge Function

Function

The Purge function allows an SGSN to inform the HLR that it has deleted the

MM and PDP contexts of a detached MS

After the MS detach from the network:

The SGSN may delete the MM/PDP context immediately

the SGSN may keep the MM/PDP context for some time of the detached MS

Purge Timer Function

Allows the SGSN to inform the HLR that it has deleted the MM and PDP

contexts of a detached MS.

The purge timer is set longer than the mobile reachable timer


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Purge Function

1. Purge MS

2. Purge MS Ack

SGSN HLR


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Contents


2.1 Basic concepts





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Authentication Function

Function

Permit the network to check whether the identity provided by

the mobile station is acceptable or not;

Provide parameters enabling the mobile station to calculate a

new ciphering key ;UMTS and GSM

Provide parameters enabling the mobile station to calculate a

new UMTS integrity key;UMTS only

Permit the mobile station to authenticate the network.UMTSonly


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Authentication types:

GSM Authentication

Using triplet: RAND, SRES, Kc Using GPRS Encryption Algorithm (GEA)

UMTS Authentication

Using quintet: RAND, XRES, AUTN, CK, IK

AUTN: for UE authenticate network

IK: for data integrity function

Using UMTS Encryption Algorithm (UEA)

These procedures are used independent of the GSM or UTRAN RANs,

i.e. each procedure may be executed in A/Gb mode or in Iu mode.


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1a. Send Authentication Info

2a. Authentication and Ciphering Request

1b . Send Authentication Info ack

2b. Authentication and Ciphering Response

MS BSS/UTRAN HLR/AucSGSN


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Authentication Function(3G)MS VLR/SGSN HE/HLR

Generate authentication

vectors AV(1..n)

Store authentication vectors

Select authentication vector AV(i)

Au then tication da ta request

Au then tication data response

AV(1..n)

User authentication request

RAND(i) || AUTN(i)

User authentication response

RES(i)

Compare RES(i) and XRES(i)

Verify AUTN(i)

Compute RES(i)

Compute CK(i) and IK(i) Select CK(i) and IK(i)

Authentication and

key e stablishment

Distribution of

authenticationvectors from HE

to SN


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Identity Check

Function

Get IMSI from MS

Check the IMEI

1. Identity Response

2. Check IMEI

1. Identity Request

2. Check IMEI Ack

MS BSS/UTRAN EIRSGSN


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P-TMSI Reallocation

Function

The SGSN may reallocate the P-TMSI at any time

The reallocation procedure can be performed by the P-TMSIReallocation procedure

The P-TMSI can be included in the Attach or Routeing Area Update

procedures.

2. P-TMSI Reallocation Complete

1. P-TMSI Reallocation Command

MS BSS/UTRAN SGSN


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Contents


2.1 Basic concepts





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Location Management

Function

A mechanisms for cell and PLMN selection;

A mechanism for the network to know the Routeing Area for MSs in STANDBY,

PMM-IDLE, READY, and PMM-CONNECTED states;

A mechanism for the 2G-SGSN to know the cell identity for MSs in READY

state;

A mechanism for the UTRAN to know the URA identity or cell identity for MSs

in PMM-CONNECTED state;

A mechanism for the UTRAN to indicate to an MS in RRC Connected mode

when a Routeing Area Update procedure shall be performed by providing the

RAI;

A mechanism for the network to know the address of the serving RNC handling

an MS in PMM-CONNECTED state. This mechanism is the serving RNC

relocation procedure

Layered Location Management Mode (2G)


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SGSN

HLR

BSS

MS

SGSN number

Ready state: Current cell ID, RAI

Standby state: last known Cell ID, RAI



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SGSN

HLR

RNC

MS

SGSN number

PMM-connected state: RNC ID, RAI, SAI

PMM-idle state: RAI, SAI


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Routeing Area Update Procedure

RAU procedure will happen in the following two case:

MS entered a new Route Area

Periodic RAU ( after periodic timer expires)

In the viewpoint of SGSN:

intra-SGSN RAU

Inter-SGSN RAU

R i A U d P d


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Routeing Area Update Procedure

MS

RAI 2 RAI 4

SGSN SGSN

RAI 1 RAI 3

cell

Intra SGSN-RAU

Inter SGSN -RAU

Gn

I t SGSN RAU P d (2G)


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Inter-SGSN RAU Procedure (2G)



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Inter SGSN RAU Proced re (3G)


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Summary


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Summary

Attach, location management, security function and detach

procedures are the main procedures in PS core network.

SRNS relocation procedure and Service request procedure

are newly added in UMTS PS core network.

Contents


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Contents

1. GPRS Network Structure




Paging Summary


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Paging Summary

The MM state in SGSN and MS before paging:

PMM-IDLE

STANDBY mode

Change MM state in MS to PMM-Connected or Ready after

successful paging.

Identification of MS in Paging message:

P-TMSI is used to identify the MS

If P-TMSI is invalid or MS not respond ,then use IMSI

Paging for GPRS (2G)


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Function

An MS in STANDBY state is paged by the SGSN before a

downlink transfer to that MS

Paging move the MS state from STANDBY to READY.

Any uplink data from MS is a valid response to paging



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5. Any LLC Frame

4. Any LLC Frame

3. GPRS Paging Request

2. Paging Request

1. PDP PDU

MS BSS SGSN

STANDBY

READY

(IMSI, P----TMSI,

Area, ChannelNeeded, QoS,

DRX

Parameters)

(Receive Ready or

Information frame)

Paging Initiated by CN (3G)


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PS Paging Initiated by 3G-SGSN without RRC Connection

for CS

A CN node requests paging only for MSs in PMM-IDLE state

The RNS controls whether the MS has an established RRC

connection or not

MS has no RRC connection

Paging Type 1 is transferred on the Paging channel



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4. Service Request

4. Service Request

3. Paging Type12. Paging

MS RNS MSC/VLR

3G-SGSN

1. PDP PDU orDownlink signalingPMM IDLE

PMM

CONNECTED

(PCH paging)(IMSI,

P----TMSI, Area,

CN DomainIndicator, DRX

parameters)

PS Paging Initiated by 3G-SGSN without RRC Connection

for CS

Summary


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Summary

In UMTS, Paging type 1 for UE without RRC connection

with RNC, Paging type 2 for UE with RRC connection with

RNC.

CS paging can be executed via PS.

Contents


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Contents

1. GPRS Network Structure




Contents


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Contents


4.1 Basic concepts

4.2 PDP Context Activation Procedure

4.3 PDP Context Modification Procedure

4.4 PDP Context Deactivation Procedure

Session Management


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Session Management

Function

Establish and monitor a packet tunnel from MS to GGSN, and allocate

system resource for the packet service.

Important Procedure PDP Context Activation

PDP Context Modification

PDP Context Deactivation

PDP Context


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PDP Context

PDP Context: Packet Data Protocol context

PDP context contains all the information needed to transfer

user data between MS and GGSN.

The context includes parameters such as RA, QoS (Quality of

Service), Charging ID etc.

PDP context exists in MS, SGSN, GGSN.

PDP Context


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PDP Context

XXIndex of the PDP context.PDP Context Identifier

XXThe quality of service profile subscribed.QoS Profile Subscribed

XXSpecifies whether the MS is allowed to use the APN inthe domain of the HPLMN only, or additionally theAPN in the domain of the VPLMN.

VPLMN AddressAllowed

XXThe IP address of the GGSN currently used.GGSN Address in Use

XTunnel Endpoint Identifier for the Iu interface.TEID for Iu

XXTunnel Endpoint Identifier for the Gn and Gp interfaces.TEID for Gn/Gp

XXTransaction Identifier.TI

XXNetwork layer Service Access Point Identifier.NSAPI

XXThe APN currently used. This APN shall be composedof the APNNetwork Identifier and the APN Operator

Identifier.

APN in Use

XXThe APN received from the HLR.APN Subscribed

XXPDP address, e.g. an IP address.PDP Address

XXPDP type, e.g. PPP or IP.PDP Type

XXPacket data protocol state, INACTIVE or ACTIVE.PDP State

Iumode

A/Gbmode

DescriptionField

Each MM context contains zero or more of the following PDP contexts:

PDP Context


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Co te t

XThe IP address of the RNC currently used.RNC Address in Use

XXThe charging characteristics of this PDP context, e.g.normal, prepaid, flat-rate, and/or hot billing.

PDP Context ChargingCharacteristics

XXCharging identifier, identifies charging records generatedby SGSN and GGSN.

Charging Id

XSequence number of the next uplink in-sequencePDCP-PDU expected from the MS.

PDCP-SNU

XSequence number of the next downlink in-sequencePDCP-PDU to be sent to the MS.

PDCP-SND

XXGTP-U sequence number of the next uplink N-PDU to besent to the GGSN.

GTP-SNU

XXGTP-U sequence number of the next downlink N

-PDU tobe sent to the MS.GTP

-SND

XSNDCP sequence number of the next uplink N-PDUexpected from the MS.

Receive N-PDU Number

XSNDCP sequence number of the next downlink N-PDUto be sent to the MS.

Send N-PDU Number

XThe aggregate BSS quality of service profile negotiatedfor the packet flow that this PDP context belongs to.

Aggregate BSS QoSProfile Negotiated

XPacket flow identifier.Packet Flow Id

XThe RLC/MAC radio priority level for uplink user datatransmission.

Radio Priority

XXThe quality of service profile negotiated.QoS Profile Negotiated

XXThe quality of service profile requested.QoS Profile Requested

MM Context and PDP Context


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HLR

SGSNBSC

or RNC

MS GGSN

GnGb/ IuUu

PDP context #n

.

.

PDP context #1

MM context

PDP context #n

.

.

PDP context #1

MM context

PDP context #n

.

.

.

PDP context #1

PDP State


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Deactivate PDP Context

or

MM state change to IDLEor PMM-DETACHED

Activate PDP

Context

INACTIVE

ACTIVE

PDP state

inactivecannottransmit data

activecan transmitdata

PDP Type and PDP Address


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yp

PDP Type

IPV4

IPV6

PPP

PDP Address

Static IP

Public IP

Allocate by the operator

Dynamic IP

Private IP

Allocate by GGSN, DHCP or Radius

QoS


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QoS: quality of service

It is a group of parameters that can define the network ability,

such as the bit rate for downlink or uplink data transmission

and the reliability class and so on

It is end to end concept

APN


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APN structure: APN-NI+APN-OI

huawei.com.cn.mnc.mcc.gprs

APNNetwork ID

APNOperator ID

Operator ID : fixed extension, must end with .gprs

Network ID shall not end with .gprs

APN


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MS SGSN

GGSN1

GGSN2

GGSN3

DNS

APN1

APN2

APN3

APN1=GGSN1 IP1

APN2=GGSN2 IP2

APN3=GGSN3 IP3

APN

APN GGSN IP

APN1

APN2

APN3

IP1

APN


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SGSN

MS

SGSN

MS

internet

GGSN GGSN

Roaming

APN:CMNET

GuangDong province

General

APN

APN


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SGSN

MS

SGSN

MS

GGSN GGSN

Roaming

APN:test.xy

VPN tunnel

Province 1

Local APN

Province 2

APN


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DNS

BTS/NodeB

SGSN

MS

DNS

BSC/RNC

GGSN (B)BackboneBackbone

DNS

ISP BISP B

ISP AISP A

Corp.Network

Corp.Network

GGSN (A)

APNAPN--NI/NI/

Or APNOr APN--NI+APNNI+APN--OIOI

APNAPN--NI+APNNI+APN--OIOI GGSN IP addressGGSN IP address

APNAPN--NINI

Contents


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4.1 Basic concepts




Activation Procedure


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PDP context activation procedure

To establish a PDP context between the MS and the

SGSN, the GGSN

Activation procedure types:

PDP context activation procedure

Secondary PDP Context Activation Procedure

Network-Requested PDP Context Activation

Procedure

PDP Context Activation Procedure (2G)


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2G-GGSN

5. Activate PDP Context Accept

3. Create PDP Context Response

3. Create PDP Context Request

1. Activate PDP Context Request

2G-SGSNBSS

2. Security Functions

MS

4. BSS Packet Flow Context Procedures

C1

C2

PDP Context Activation Procedure (3G)


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(PDP Type, PDP Address, Access Point Name,

QoS Requested)

Charging ID allocation

IP address

3G-GGSN




1. Activate PDP Context Request

3G-SGSNUTRANMS

4. Radio Access Bearer SetupQos

C1

C2

6. Update PDP Context Response

5. Update PDP Context Request

Handling in MS


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MS start and send Active PDP context request to SGSN

Provide QoS parameter

Provide a APN-NI

Provide a static IP or null

Receive ACCEPT from SGSN If the QoS not accept by MS, then starts delete PDP context

procedure.

Handling in SGSN


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Check subscriber data

APN selection According to TS 23.060

default APN, APN provide from MS and the APN subscribed in HLR APN-NI.APN-OI

Interrogate DNS Hostfile/Cache/DNS server

QoS negotiation QoS provided from MS, default QoS ,QoS subscribed in HLR

Send message Create PDP context request to GGSN

RAB assignment (UMTS only)

Send message Active PDP context accept to MS Dynamic IP address

QoS

Handling in GGSN


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Check the APN provided by SGSN

QoS negotiation

Allocate a dynamic IP to the MS Allocate a charging ID for the PDP context

Return a CREATE PDP CONTEXT ACCEPTmessage to SGSN

Dynamic IP

QoS

Charging ID

Other information Update PDP context

Handling in RNC


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RAB assignment

MS SGSN GGSN

RNCRAB assignment(Final negotiated

Qos)

Allocate Iu interface resourceAllocate radio resource

Secondary PDP Context Activation Procedure


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The Secondary PDP Context Activation procedure may be

used to activate a PDP context while reusing the PDP

address and other PDP context information from an already

active PDP context, but with a different QoS profile.

Procedures for APN selection and PDP address negotiation

are not executed.

A unique TI and a unique NSAPI shall identify each PDP

context sharing the same PDP address and APN.

Secondary PDP Context Activation

Procedure


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Procedure

2G-GGSN

7. Activate Secondary PDP Context Accept



1. Activate Secondary PDP Context Request

2G-SGSNBSS


MS

5. BSS Packet Flow Context Procedures

C1

C2

For GPRS

Secondary PDP Context Activation

Procedure


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Procedure For UMTS

3G-GGSN




1. Activate Secondary PDP Context Request

3G-SGSNUTRANMS

4. Radio Access Bearer Setup

C1

C2



Network-Requested PDP Context

Activation Procedure


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Activation ProcedureMS SGSN GGSN

3. PDU Notification Request

HLR

1. PDP PDU

2. Send Routeing Info for GPRS

2. Send Routeing Info for GPRS Ack

4. Request PDP Context Activation

5. PDP Context Activation procedure

3. PDU Notification Response

Contents


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4.1 Basic concepts




Modification Procedures


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Modification procedures modify parameters that were negotiated

during an activation procedure for one or several PDP contexts.

An MS, a GGSN, an SGSN, or an RNC can request a modification

procedure.

The following parameters can be modified:

QoS Negotiated;

Radio Priority;

Packet Flow Id;

PDP Address (in case of the GGSN-initiated modification procedure);

TFT (in case of MS-initiated modification procedure).

MS-Initiated Modification Procedure


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GGSN



SGSNUTRANMS

1. Modify PDP Context Request

5. Modify PDP Context Accept

4. Radio Access Bearer Modification

C1

Contents


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4.1 Basic concepts




MS Initiated Deactivation Procedure


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For GPRS

2G-GGSN

4. Deactivate PDP Context Accept



1. Deactivate PDP Context Request

2G-SGSNMS


C1

MS Initiated Deactivation Procedure


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3G-GGSN



3G-SGSNUTRANMS

1. Deactivate PDP Context Request

4. Deactivate PDP Context Accept

5. Radio Access Bearer Release

C1

Summary


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The course includes the flowing:

MM procedure

SM procedure


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1. Owb000001 Gprs Principle Issue3.0

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