GPRS Fundamental

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OWB000001 GPRS Fundamental

ISSUE 2.0

HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 1

GPRS principle is the basic part of the whole system and the later products learning. This slide will help us to understand the GPRS system networking and some important procedure.


References

3GPP protocol 23060

3GPP protocol 29060

3GPP protocol 24008


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


Chapter 1 GPRS Network Structure

Chapter 2 Mobility Management

Chapter 3 Radio Resource management

Chapter 4 Session Managment


GPRS Network Structure

What is GPRS?

General Packet Radio Service

Why 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



FR

EIREIRHLRHLRSMS-GMSCSMS-IWMSCSMS-GMSCSMS-IWMSC

MSC/VLRMSC/VLR

BSSBSS

UTRANUTRAN

SGSNSGSN

SGSNSGSN

GGSNGGSN

BGBG

CGCG

TEPDN

SS7

ATM

DDN

ISDN

Ethernet.etc

GPRSBackbone

Gs Gd Gr Gf Gc

Gb

Iu

Um

Um

Gp

Gi

Gn

Gn

ATM Ga

SCPSCP GMLCGMLC

Ge Lg

Ga



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: Bordering Gateway

PDN: Packet Data Network



Some Abbreviation

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



Important Entity Function __ SGSN

Mobility management

− The mobility management functions are used to keep track of the current location of an MS within the PLMN or within another PLMN.

Session management

− 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


GPRS Network Structure Important Entity Function __ GGSN

Session management

− 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



Important Entity Function __ CG

Real-time collection of GPRS bills

Temporary storage and buffering of GPRS bills

Pre-processing of GPRS bills

Sending GPRS bills to the billing center


GPRS Network Structure Important Entity Function __ DNS

SGSN GGSN(A)

MS

BSS

GPRS backboneGPRS backboneISP AISP A

ISP 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)



Important Entity Function __ HLR/AUC

Saving and updating GPRS subscriber subscription data

User authentication

Providing location/routing 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

Subscriber tracing (optional)



Section 1 Attach and Detach

Section 2 Location Management

Section 3 Security Function







GMM (GPRS Mobility Management)

Function of the Mobility Management

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

Subscription data management

Ms states management


GMM (GPRS Mobility Management)

GMM specific procedures

Attach procedure

RAU and periodic

Detach

Service request (UMTS only)

GMM common procedures

P-TMSI reallocation procedure

Authentication procedure

Identification procedure


2G Network States Transition

PDU transmission

Implicit Detachor

Cancel Location

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

READY

STANDBY

IDLE

READY

STANDBY

READY timer expiryorForce to STANDBYorAbnormal RLC condition


3G Network States Transition

PMM-DETACHED

PS Attach

PS SignallingConnection Release

PS SignallingConnection Establish

PS Detach

PMM-CONNECTEDPMM-IDLE

Detach,PS Attach Reject,RAU Reject

PMM-DETACHED

PS Detach

PMM-CONNECTED

Serving RNCrelocation

3G-SGSN MM StatesMS MM States

SM-ACTIVE orINACTIVE




Detach,PS Attach Reject,RAU RejectPS Attach

PS SignallingConnection Establish

PS SignallingConnection Release

PMM-IDLE


Attach Procedure

Function

An MS shall perform a GPRS Attach to the SGSN in order to obtain access to the GPRS services. If the MS is connected via a GSM radio, it shall perform a GSM GPRS Attach procedure. If the MS is connected via a UMTS radio access network, it shall perform a UMTS GPRS Attach procedure


Attach Procedure

(IMSI or PTMSI+RAI) (PTMSI)

(IMSI)

(Identity Type = IMSI)

(IMSI)


Attach Procedure


Attach Procedure

Results after any attach procedure

SGSN get subscriber data from HLR

HLR recorded the MS’s serving SGSN number

SGSN and MS create MM context for the MS

MS can request Session Management services


Reject caused by GPRS Core NetworkCause in attach reject Actions in PS domain Actions in CS domain

Illegal MS The MS shall set the GPRS update status to GU3 ROAMING NOT ALLOWED The SIM/USIM shall be considered as invalid for GPRS services until switching off or the SIM/USIM is removed

If the MS is IMSI attached, the MS shall in addition set the update status to U3 ROAMING NOT ALLOWED, shall delete any TMSI, LAI and ciphering key sequence number

Illegal ME

GPRS services not allowed The MS shall set the GPRS update status to GU3 ROAMING NOT ALLOWED; The SIM/USIM shall be considered as invalid for GPRS services until switching off or the SIM/USIM is removed.

no effect

GPRS services not allowed in this PLMN

shall set the GPRS update status to GU3 ROAMING NOT ALLOWED

PLMN not allowed shall set the GPRS update status to GU3 ROAMING NOT ALLOWED), shall reset the GPRS attach attempt counter and shall change to state GMM-DEREGISTERED

The MS shall perform a PLMN selection

Location area not allowed

Roaming not allowed in this location area

No Suitable Cells In Location Area shall set the GPRS update status to GU3 ROAMING NOT ALLOWED

The MS shall search for a suitable cell in another location area in the same PLMN


Attach Procedure __ MM ContextField Description A/Gb

modeIu mode

IMSI IMSI is the main reference key. X X

MM State Mobility management state, IDLE, STANDBY, READY, PMM-DETACHED, PMM-IDLE, or PMM-CONNECTED.

X X

P-TMSI Packet Temporary Mobile Subscriber Identity. X X

P-TMSI Signature A signature used for identification checking purposes. X X

IMEI International Mobile Equipment Identity X X

MSISDN The basic MSISDN of the MS. X X

Routeing Area Current routeing area. X X

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

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

Service Area Code Last known SAC when initial UE message was received or Location Reporting procedure was executed.

X

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

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

New SGSN Address The IP address of the new SGSN where buffered and not sent N-PDUs should be forwarded to.

X X

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

Kc Currently used A/Gb mode ciphering key. X 2)

CKSN Ciphering key sequence number of Kc. X 2)

Ciphering algorithm

CK

Selected ciphering algorithm (GEA).

Currently used Iu mode ciphering key.

X

1)

X

X


Attach Procedure __ MM ContextIK Currently used Iu mode integrity key. 1) X

KSI Key Set Identifier. 1) X

MS Radio Access Capability MS radio access capabilities. X

MS Network Capability MS network capabilities. X X

DRX Parameters Discontinuous reception parameters. X X

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

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

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

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

Subscribed Charging Characteristics The charging characteristics for the MS, e.g. normal, prepaid, flat-rate, and/or hot billing subscription.

X X

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

Recovery Indicates if HLR or VLR is performing database recovery. X X

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

ODB for PS parameters Indicates that the status of the operator determined barring for packet oriented services. X X

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

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


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


Detach Procedure (MS Initiation)

2 . D e le te P D P C o n tex t R esp o n se

1 . D e tach R eq u est

2 . D e le te P D P C o n tex t R eq u est

3 . D e tach A ccep t

M S B S S /U T R A N G G S N S G S N

4 . P S S ig n a llin g C o n n e c tio n R e lease

Detach type

bit4 bit3 bit2 bit1

power off detach tye


Detach Procedure

Results after any attach 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.







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)

•SGSN

•HLR

•BSS

•MS

•SGSN number

•ready state: cell number

•Standby state: RAI


Layered Location Management Mode (3G)

•SGSN

•HLR

•RNC

•MS

•SGSN number

•PMM-connect state: RNCID,RAI

•PMM-idle: RAI


Network Architecture

Route area update procedure

SGSN can manage the MS location information via RAU procedure in RAI level

Relocation procedure

Move the Iu interface to the other RNC

Handover procedure

Move the radio link to the other NodeB

old SGSN

RNC2RNC1

MS

GGSN

Iu

new SGSN

RNC4 RNC3

IU

HLR/AUC

Gn/Gp Gn/Gp

PDN

Gi

Gr GrIUIu

Gn

RA1 RA2 RA3

RA4 RA5

RA6 RA7 RA9

RA9 RA10

Iur


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)

Inter-SGSN RAU

The new SGSN find the old SGSN from the old RAI

Old SGSN stop downlink signaling, transfer MM context and PDP context to new SGSN

Tunnelling N-PDU to the new SGSN

Update PDP context and subscriber data


Routeing Area Update Procedure

MS

RAI 2 RAI 4

SGSN SGSN

RAI 1 RAI 3

cell

Intra SGSN-RAU

Inter SGSN -RAU

Gn


Inter-SGSN RAU Procedure (2G)








Service Request Procedure (UMTS only)

MS initiated

For the active PDP context request procedure

For the data transmission

Network initiated

Paging response


Service Request Procedure –MS initiatedSGSNMS

2. Service Request

3. Security Functions

RNC1. RRC Connection Request

8. Uplink PDU

1. RRC Connection Setup

4. Radio Access Bearer AssignmentRequest

6. Radio Access Bearer AssignmentResponse

5. Radio Bearer Setup

6. Radio Bearer SetupComplete

HLR GGSN

7. SGSN-Initiated PDP Context Modification

4. Service Accept


Service Request Procedure－network initiated

7. SGSN-Initiated PDP Context Modification Procedure

8. Downlink PDU

SGSNMS


RNC

3. RRC Connection Request

1. Downlink PDU

3. RRC Connection Setup

6. Radio Access Bearer AssignmentRequest

6. Radio Access Bearer AssignmentResponse

6. Radio Bearer Setup

6. Radio Bearer SetupComplete

2. Paging2. Paging

4. Service Request

HLR GGSN







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 Function

1. Purge MS

2. Purge MS Ack

SGSN HLR


Mobility Management Timer Function

Periodic RA Update Timer Function Monitors the periodic routing area update procedure in the MS Upon its expiry, the MS shall start a periodic routing area update procedure. The length of the timer is set in SGSN; The value of the timer is sent to MS

in attach accept message or routing update accept message Mobile Reachable Timer Function

Upon the expiry of this timer, the MS is detached This is reset and started when the state returns to STANDBY or PMM-IDLE The timer shall be slightly longer than the periodic RA update timer used by

an MS The length of the timer is set in SGSN

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


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. （UMTS only）


Authentication Function

1a. Send Authentication Info

2a. Authentication and Ciphering Request1b . Send Authentication Info ack

2b. Authentication and Ciphering Response

MS BSS/UTRAN HLR/AucSGSN


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

Generate authenticationvectors AV(1..n)

Store authentication vectors

Select authentication vector AV(i)

Authentication data request

Authentication data responseAV(1..n)

User authentication requestRAND(i) || AUTN(i)

User authentication responseRES(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 andkey establishment

Distribution ofauthenticationvectors from HEto SN


Authentication Function (2G-3G)

Release 99+ VLR/SGSN Release 98- VLR/SGSN

Release 99+ HLR/AuC

USIM

RAND AUTN RES

CK IK

CK, IK Kc

UTRAN

ME capable of UMTS AKA

RAND AUTN RES

[Kc]

CK, IK Kc

GSM BSS

CK, IK KcRES SRES

CK, IK Kc

ME notcapable of UMTS

AKA

CK, IK Kc

CK, IK KcRES SRES

RAND[AUTN]

SRES

[Kc]

Kc

RANDSRES

[Kc]

Kc

ME

CK, IK KcRES SRES

Quintets Triplets

CK, IK KcRES SRES

UMTS security GSM security

CK, IK Kc

GSM security context

Release 99+VLR/SGSN

Release 98-VLR/SGSN

Release 98- or Release 99+HLR/AuC

SIM

RANDSRES

CKIK

Kc

UTRAN

R99+ UE

RANDSRES

[Kc]

Kc

GSM BSS

Kc CK, IK

R98- UE

Kc CK, IK

RANDSRES

[Kc]

Kc

RANDSRES

[Kc]

Kc

R99+ UEor

R98- UE

Triplets Triplets


Identity Check

Function

Get IMSI from MS

Check the IMEI


Identity Check

1. Identity Response 2. Check IMEI

1. Identity Request

2. Check IMEI Ack

MS BSS/UTRAN EIRSGSN


P-TMSI Reallocation

Function

The SGSN may reallocate the P-TMSI at any time

The reallocation procedure can be performed by the P-TMSI Reallocation procedure

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


P-TMSI Reallocation

2. P-TMSI Reallocation Complete

1. P-TMSI Reallocation Command

MS BSS/UTRAN SGSN







Paging Summary

MM state in SGSN,MS

PMM-IDLE

STANDBY mode

A Paging message is received by MS

P-TMSI is used to identify the MS

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

Change MM state in MS to PMM-Connected or Ready


Paging for GPRS (2G)

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


Paging for GPRS (2G)

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, Channel Needed, QoS, DRX Parameters)

(Receive Ready or Information frame)


Paging Initiated by CN (3G)

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



4. Service Request4. Service Request

3. Paging Type12. Paging

MS RNS MSC/VLR

3G-SGSN1. PDP PDU or

Downlink signalingPMM IDLE

PMM CONNECTED

(PCH paging)(IMSI, P-TMSI, Area, CN Domain Indicator, DRX parameters)

PS Paging Initiated by 3G-SGSN without RRC Connection for CS



PS Paging Initiated by 3G-SGSN with 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

In this case, MS has an established RRC connection for CS service

Paging Type 2 is base on the establish RRC connection


Paging Initiated by CN (3G)PS Paging Initiated by 3G-SGSN with RRC Connection for CS

4. Service Request

4. Service Request

3. Paging Type22. Paging

MS RNS MSC/VLR

3G-SGSN

Connection Established

1. PDP PDU orDownlink signalling

(RRC paging)(IMSI, P-TMSI, Area, CN Domain Indicator, DRX parameters)

PMM IDLE

PMM CONNECTED







Session Management Function

Establish and monitor a packet tunnel from MS to GGSN, and allocate system resource for the packet service.

Important ProcedurePDP Context ActivationPDP Context ModificationPDP Context Deactivation


Session Management

DNS

BTS

SGSN

MS

DNS

BSC

GGSN (B)BackboneBackboneDNS

ISP BISP B

ISP AISP A

Corp.Network

Corp.Network

GGSN (A)

•APN_NI/

•Or APN_NI+APN_OI

•APN_NI+APN_OI ＝

GGSN IP address

•APN-NI


PDP Context

PDP Context The PDP context is 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 Routing, QoS (Quality of Service), Charging ID etc.

PDP context exists in MS, SGSN, GGSN and RNC/BSS


PDP Context

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

Field Description A/Gb mode Iu mode

PDP Context Identifier Index of the PDP context. X X

PDP State Packet data protocol state, INACTIVE or ACTIVE. X X

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

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

APN Subscribed The APN received from the HLR. X X

APN in Use The APN currently used. This APN shall be composed of the APNNetwork Identifier and the APN Operator Identifier.

X X

NSAPI Network layer Service Access Point Identifier. X X

TI Transaction Identifier. X X

TEID for Gn/Gp Tunnel Endpoint Identifier for the Gn and Gp interfaces. X X

TEID for Iu Tunnel Endpoint Identifier for the Iu interface. X

GGSN Address in Use The IP address of the GGSN currently used. X X

VPLMN Address Allowed Specifies whether the MS is allowed to use the APN in the domain of the HPLMN only, or additionally the APN in the domain of the VPLMN.

X X

QoS Profile Subscribed The quality of service profile subscribed. X X


PDP ContextQoS Profile Requested The quality of service profile requested. X X

QoS Profile Negotiated The quality of service profile negotiated. X X

Radio Priority The RLC/MAC radio priority level for uplink user data transmission. X

Packet Flow Id Packet flow identifier. X

Aggregate BSS QoS Profile Negotiated

The aggregate BSS quality of service profile negotiated for the packet flow that this PDP context belongs to.

X

Send N-PDU Number SNDCP sequence number of the next downlink N-PDU to be sent to the MS. X

Receive N-PDU Number SNDCP sequence number of the next uplink N-PDU expected from the MS. X

GTP-SND GTP-U sequence number of the next downlink N-PDU to be sent to the MS. X X

GTP-SNU GTP-U sequence number of the next uplink N-PDU to be sent to the GGSN. X X

PDCP-SND Sequence number of the next downlink in-sequence PDCP-PDU to be sent to the MS.

X

PDCP-SNU Sequence number of the next uplink in-sequence PDCP-PDU expected from the MS.

X

Charging Id Charging identifier, identifies charging records generated by SGSN and GGSN. X X

PDP Context Charging Characteristics

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

X X

RNC Address in Use The IP address of the RNC currently used. X


MM Context and PDP Context

HLR

SGSNBSC

or RNC

MS GGSNGnGb/ IuUu

MM context

PDP context #1

.

.

PDP context #n

MM context

PDP context #1

.

.

PDP context #n

PDP context #1

.

.

.

PDP context #n


Important Concept __ PDP State

Deactivate PDP Contextor

MM state change to IDLEor PMM-DETACHED

Activate PDPContext

INACTIVE

ACTIVE PDP state

inactive：cannot transmit data active：can transmit data


Important Concept __ PDP Type and PDP Address

PDP Type

IPV4

IPV6

PPP

PDP Address

Static IP

− Public IP

− Allocate by the operator

Dynamic IP

− Private IP

− Allocate by GGSN, DNCP or Radius


Important Concept __ QoS

QoS is 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


Important Concept __ APN APN structure: APN_NI+APN_OI

huawei.com.cn.mnc<MNC>.mcc<MCC>.gprs

APNNetwork ID

APNOperator ID

•Operator ID : fixed extension, must end with “.gprs”

•Network ID shall not end with “.gprs”


Important Concept __ APN

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



SGSN

MS

SGSN

MS

•internet

GGSN GGSN

Roaming

APN:CMNET

•GuangDong province

General APN



SGSN

MS

SGSN

MS

GGSN GGSN

Roaming

APN:test.xy

VPN tunnel

Province 1

Area APN

Province 2


Activation Procedure

PDP context activation procedure

To establish a PDP context between the MS and the

SGSN, the GGSN


PDP Active Procedure (2G)

2G-GGSN

5. Activate PDP Context Accept

3. Create PDP Context Response

3. Create PDP Context Request

1. Activate PDP Context Request

2G-SGSNBSS


MS

4. BSS Packet Flow Context Procedures

C1

C2


PDP Active Procedure (3G)

(PDP Type, PDP Address, Access Point Name, QoS Requested)

Charging ID allocation

IP address

3G-GGSN

7. Activate PDP Context Accept

3. Create PDP Context Response

2. Create PDP Context Request

1. Activate PDP Context Request

3G-SGSNUTRANMS

4. Radio Access Bearer Setup （Qos）

C1

C2

6. Update PDP Context Response

5. Update PDP Context Request


Handle in MS

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.


Handle in SGSN

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 Send message “active PDP context accept” to MS

Dynamic IP address QoS


Handle in RNC

RAB assignment

MS SGSN GGSN

RNCRAB assignment (Final negotiated Qos)

Allocate Iu interface resource Allocate radio resource


Handle in GGSN

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 ACCEPT message to SGSN Dynamic IP

QoS

Charging ID

Other information

Update PDP context


Typical Application E-mail from fixed to mobile network

BTS/NodeB SGSN

MS

BSC/RNC

GGSNBackboneBackbone

ISPISP

Accessserver

Mailserver

e-mail

HLR


Typical Application

E-mail from mobile to fixed network

BTS/NodeB SGSN

MS

BSC/RNC

GGSNBackboneBackbone

ISPISP

Accessserver

Mailserver

e-mail

HLR


Summary

In the whole GPRS fundamental, you should remember some important concept and the basic signalling procedure

Summary

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GPRS Fundamental

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