MGWOverview by ziafat ali

1 © NOKIA GW_Overview / 1.6.2001 / O.Liinamaa COMPANY CONFIDENTIAL

Nokia Multimedia Gateway


Objectives

• Overview: MGW in two different networks

• Reference Interfaces & Protocols

• A4 Platform

• Physical interfaces & handling of interface resources

• U2 and U2.1 Features


Road from Rel.99 to All-IP2001 2002 2003

Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

MSC Server concept Release 1U2 & M12 MGW Rel.4

U2.1 for MSC server & All-IP Applications

Launch, GW Rel.99U1+ & M11

Trial, GW Rel.99U1 & M10

Commercial, GW Rel.99U1.5 & M11

U3 & M13

Q1


Multimedia Gateway overview

• Nokia Multimedia Gateway is used for transmitting media between different types of interfaces.

• MGW allows operators to combine transport of both circuit switched and packet switched connections into a single transport network

• Multimedia Gateway provides:• A-interface towards GSM BSS• Iu-interface towards 3G RAN• Circuit-switched TDM interface

towards PSTN• ATM and IP interfaces towards

backbone

4 © NOKIA GW_Training / 6.2.2001 / O.Liinamaa


MGW in both MSC Server and All-IP Env.

IP/ATMBackbone MGWMGWMGW

HLR/ HSS

VMSSVMSSA

Iu-CS

Mc SIGTRAN,H.248

ISUP

ISUP (optional)

BICC CS-2or SIP-T

CAMEL/INAPCAMEL/INAP

MAP MAP

A

3G RAN

GSM BSS

SGSNGGSN

Iu-PSAll-IP RAN

GCSGCS

Iu-PS

CPSCPS

Mg SIP

TDM Based CS Domain

-PSTN-Own CS Domain-Other PLMN

mCreate

SIGTRAN, H.248

Nc

Nb

Gn

Gi

MAP

Same MGW can be used for transmitting the user

plane traffic in both circuit switched core

and All IP core

Same MGW can be used for transmitting the user

plane traffic in both circuit switched core

and All IP core


Gateway Main Characteristics

• User plane transport and conversion between ATM, IP and switched circuit networks

• Signalling transport between network interfaces and MSC Server or GCS

• IPv6 / IPv4 support

• Media processing - Transcoding, Echo Cancelling, Continuity Check, DTMF Generation and detection

• Tone and announcement generation & conference functionality

• TrFO&TFO Support

• Handling of media resources under control of GCS or MSC Server via H.248 (MEGACO)

6 © NOKIA GW_Training / 6.2.2001 / O.Liinamaa


MGW Interfaces & ProtocolsRel.4 Network

Iu-CS

RNC

MSCServer

AAL2ATM

TDM

H.248IP

MSCServer

Mc

MGW

Nc

AAL2/AAL5ATM Nb

McSigtran

IP

BICCATM/IP

• RANAP for radio access control

• BICC for call control

• H.248 for MGW control

• AAL2 for user data and AAL5 for signaling over ATM

• RTP for user data over IP

• Sigtran for transmitting SS7 signaling over IP

HLR Services

MAP CAP

MGWRTPIP

PSTNRANAP

AAL5/ATM SS7

BSC

SigtranIP

A

TDM

BSSAP

H.248IP


MGW interfaces & protocolsAll-IP Network

SS7

RTP

IP

PSTN

GCSGCS

SIP

CPS

MGWMGW

SIGTRAN

TDM

H.248

SIP

• SIP for session control

• H.248 for MGW control

• RTP for user data over IP

• Sigtran for transmitting SS7 signaling over IP


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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

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MGW U2MAX HW

Max. Number of units:

IPNIU 2 pairNIS1/0 5+2 pairNIWU 20 pcsA2SU 14 pcsTCU 78 pcsISU 11 pcs


3GPP Referred Functionalitythree functional entities in one HW

• Terminates - SCN & Packet Media Termination• Tones and Announcements

• Similar Functionality as the Media Gateway

• IP to IP Calls only• Tones and Announcements• Conferencing Services

• Signalling Transfer Point• SS7 Transport Layer Conversion• Protocol Translation

Nokia Multime

dia Gatewa

y

Nokia Multime

dia Gatewa

y

Media Gateway - MGW

Multimedia Resource Function Processor - MRFP

Signalling Gateway - SGWMRFP

MGW

SGW


SGW in MGWMSC Server MSC Server

SGW

MGW

SGW

BSC

GSM BSS

RNCWCDMA

PSTN/PLMN

1) RANAP (SS7) / ATM <---> IP2) BSSAP (SS7) / TDM <---> IP3) MAP/CAP/INAP (SS7 SCCP) / TDM <---> IP4) ISUP/TUP/IUP (SS7 MTP3) / TDM <---> IP

ATM/IPBackbone

1.

2.

3.& 4.

TDM

ATM

IP/ATM

TDM

SIGNALINGTRANSPORT


IPA2800 Platform Evolution in Mobile Core Network

A2 A3 A4.1

• Multimedia gateway, U1• Radio Network Controller, RN1

• Capacity 5 Gbits/s

• MGW U1.5• RNC RN1.5• RNC RN2

• Capacity 10 Gbits/s

• MGW U2 •Capacity 10 Gbits/s

The IPA2800 is Nokia´s ATM based multipurpose product platform IPA2800 for mobile core and3G radio access network elements. It is used in Radio Network Controller, Multimedia Gateway and CS-GW.

• MGW U3• RNC RN3 • CS-GW Rel.2

•Capacity 20 Gbits/s

A5

20012001

2002

2003

• MGW U2.1• RNC RN2.1• CS-GW Rel.1 •Capacity 10 Gbits/s

2002

A4.2


New HW in A4 Platform Release• IP-NIU interface unit for IP connections.

• - Needed if media is transmitted over IP backbone. • - 1G Ethernet and 100M Eth.

• VANU (Voice Announcement Unit)• - New functional unit for providing announcements. • - Mandatory, HW similar to other signaling units.

• New signaling unit type CCP10 • - Next generation of the CCPC2-A signaling unit• - (equivalent to CP710-A in DX).• - Basic signaling unit for new deliveries.

• IW1S1 interface unit for STM-1 VC-12 interface. • - For providing TDM connections over STM-1

interface• - Optional, available in A4.2 release.

Other HW similar to MGW Rel'99


MGW Functional Units

-POS-IP over ATM-Ethernet

SFU

MXU

MXU

MXU

NIWU

TCU

A2SU

EHU

IPS1 NIP1

OMU

SPMU

VANU

WDU

E1/T1/J1TDM

CACU

CM

Iu/ATM Core

PSTNAIWF

STM-1TDM

NEMU

NIS1STM-1ATM

FDU

Ethernet

100BaseT

IP Core

TBU

IPFE/GE

ISU

PSTNAIWF IW1S1

E1/T1/JT1IMA/ATM Iu

(In U2.1)

See notes pages forunit descriptions

LAN

ESA12

New Unitin U2

New Unitin U2.1


User Plane Data Flow ExampleCall from RAN to ATM backbone (TrFO)

MXU

SFU

MXU

TBUOMU

SPMU

ISU

WDU

Ethernet

100Base-TX

CM

NIS1

NIS1

MXU

TCU

A2SU

NEMU

Iu Media From RNC

MXUNIWU

AAL2 termination.

IU UP not terminated

Transcoder in 'idle state'

CACU

A2SU

AAL2 mux/demux

AAL2 mux/demux

ATMbackbone

ATM STM-1

Media to bb

VANU


Signaling FlowExample: RANAP from RNC to MSC Server

SFU

MXUISU

NIS1

IP-NIU

Iu RANAPover AAL5

ATM STM-1

RANAPover IP

MTP3 / M3UA interworking

RNC

MSCServer

FE

MGW

1G Ethernet


ATM over SDH / STM-1or E1/T1/JT1 (IMA) used for:• Iu• ATM backbone

TDM used for:• A-interface• PSTN

IP used for:• H.248 control • IP user plane to backbone• SIGTRAN

Network interfaces

TDM

IPATM

STM-1Ethernet

Packet over SDH/Sonet

IP over ATM

MGWMGW

E1/T1/JT1

E1/T1/JT1 STM-1

(STM-1 in U2.1)


ATM Interfaces

SFU

NIS1

RNC

RNC

RNC

SDH

VC-4

MGW

NIP1

MXU

1…16 *E1

RNC

- Iu & ATM backbone interface plug-in-unit NI4S1- 4 STM-1 (155Mbit/s) interfaces per unit- Supported formats:VC-4 or 3*VC-3

- Iu & ATM backbone interface plug-in-unit NI4S1- 4 STM-1 (155Mbit/s) interfaces per unit- Supported formats:VC-4 or 3*VC-3

- E1/T1/JT1 IMA provided by NIP1 available for Iu interface in low bandwith applications

- E1/T1/JT1 IMA provided by NIP1 available for Iu interface in low bandwith applications

VC-3


Utilizing MGW as ATM switch

MGW

• Since Iu-CS and Iu-PS use own ATM virtual connections, it is possible to route both CS and PS traffic inside the same STM-1 interface to the MGW/SGSN site.• Iu-PS traffic is cross-connected on the ATM layer inside the MGW and routed to SGSN.

STM-1 VC-4Iu-CS & Iu-PS

STM-1 VC-4Iu-CS & Iu-PS

Iu-PS

SGSN

NIS1

RNC

SFU

Core Site


AAL2 Nodal Function in Nb

MSC Server

MGW1

RNC/MGW

MGW2

H.248

AAL2 Bearer establishment from RNC/MGW to MGW2

Bearer establishment sentdirectly to MGW2 without

MSC server control

MSC server may request AAL2 bearer establishment from RNC directly to MGW2 (through all

MGWs between RNC and e.g. PSTN interconnect)

RANAP

No H.248 signaling needed

TDM lines


IP User Plane Interfaces

IP connections are used for- H.248 signalling- SIGTRAN- User plane traffic over IP/ATM core

New i/f unit IP-NIU has two variants:1) IPS1 for STM-1 interfaces - 4 * STM-1 i/f per unit - Packet over SDH/SONET - IP over ATM2) IPFE/GE for ethernet connections -1G Eth + 8*100M Eth interfaces at one unit, only one type active.

IP connections are used for- H.248 signalling- SIGTRAN- User plane traffic over IP/ATM core

New i/f unit IP-NIU has two variants:1) IPS1 for STM-1 interfaces - 4 * STM-1 i/f per unit - Packet over SDH/SONET - IP over ATM2) IPFE/GE for ethernet connections -1G Eth + 8*100M Eth interfaces at one unit, only one type active.

SFU

IPS1

MGW

IP/ATM Backbone

8*FE

1G Eth

4*STM-1

IPFE/GE

IP Backbone

IP Backbone


Isolating Signaling from IP User Plane

• By default both signaling and user plane are routed via IP-NIU using either 100M or 1G ethernet interfaces. In 1G ethernet case it is not possible to separate signaling into own physical interface via IP-NIU.

• Signaling can be routed directly from ISU units into ESA12 Layer 2 switch in same cabinet thus enabling the isolation of signaling.

• New signaling unit CCP10 provides redundant LAN interface for signaling isolation.


Isolating Signaling from IP User Plane

IP/MPLS Backbone1G

1G

LAN1

LAN2

LAN3

UserPlane

H.248/Sigtran

O&M

ISU

OMU/NEMU

100MbNMS

E.g. Cisco OSR 7609

100Mb

MXUTCU

MXU

SFU

TCUTCU

IPFE/GEWO

IPFE/GESP

ESA12ESA12

MSC Server


TDM Interfaces• IW16P1 plug-in unit can be used

for following purposes:• A & PSTN -interface (NIWU unit)•Data connections towards IWF

• Supported formats:• 2 Mbit/s E1• 1.5 Mbit/s T1• 1.5 Mbit/s JT1

• 16 E1/T1/JT1 interfaces per unit.

• Same unit as in MGW Rel'99


ATM IMA

1…16 * E11…16 * E1

MGW

Iu-CSNIP1

RNC

• NI16P1 plug-in-unit available for ATM IMA (Inverse Multiplexing Access)

• For low bandwith ATM interface (<<155 Mbit/s).

• Several E1s can be used for one IMA group


STM-1 for TDM

New (optional) unit IW1S1 for TDM connections- One optical STM-1 i/f per unit- STM-1/VC-12 (63 PCM), Sonet (VC-11) (84 PCM) - Terminates 64k TDM channels and converts them to ATM virtual channels. - Terminates narrowband SS7 signaling links.

Available in U2.1 release

New (optional) unit IW1S1 for TDM connections- One optical STM-1 i/f per unit- STM-1/VC-12 (63 PCM), Sonet (VC-11) (84 PCM) - Terminates 64k TDM channels and converts them to ATM virtual channels. - Terminates narrowband SS7 signaling links.

Available in U2.1 release

IW1S1

MGW

SDH

PSTN

ADM

n* E1

STM-1

Direct interface to SDH (Sonet)


Allocating Resources for MSS

TDM

IPATM

MGWMGW

NIS1

NIP1 IP4S1

IPFGE

NIWU

IW1S1H.248 /IP

• MGW offers TDM, IP and ATM type resources to MSC Server.

• MSC server controls these resources via H.248.

• MGW hides the media transport layer from MSC server, e.g. MSC server does not know whether media uses STM-1 or Ethernet.

MSC ServerMSC Server


Virtual MGW

NIWU

ISU

ISU

NIS1IPNIU

ATM AAL2 Resourcesfor all MSSs

IP Resourcesfor all MSSs

H.248IP

MSS 2

CCSU/SIGU

MSS 1

CCSU/SIGU

H.248IP

NIWU

NIWU

ISU NIWU

CCSU/SIGU H.248

IP

• TDM and (AAL1 PVC) resources are dedicated to a certain MSC server.

• IP and ATM AAL2 resources all visible to all MSC servers and thus shared by all.

TDM resourcesfor Virtual MGW 2

TDM resourcesfor Virtual MGW 1


MGW Upgrade U1.5 -> U2

When M12 is updated to MSC, there are three options for MGW:

1) Rel.99 functionality in MGW is upgraded to Rel.4, i.e. MGW is upgraded from ATM module to MSC-server MGW

2) SW package is changed to U2, but the whole network element remains in Rel.99 phase.

3.) If MSC server functionality is not used in MSC M12 , then MGW may remain in U1.5 level.


MGW Capacity Roadmap

Year Release Number of Ports BHCA

2002

2003

2004

U2, U2.1

U3

30 000

30 000

600 000

600 000

600 00030 000U3

- Note. Maximum number of simultaneous calls is the number of ports divided by two, i.e. 15000.- If more capacity is needed, several MGWs can be placed to same site and clustered to establish a big capacity network element.


Main Features in U2• H.248

• Transport Signalling Gateway

• ATM AAL2 , IP and TDM connectivity

• Speech processing: Echo cancellation, announcements, conference functionality, In-band tones & Transcoding (Codecs: GSM FR, EFR and GSM/3G AMR, G.711)

• Statistics and subscriber trace

• TrFO and TFO

• Data calls

• Upgrade from Rel.99 to Rel.4

• IP QoS (DiffServ)

• IPv4 & IPv6 dual-stack

• Multimedia Gateway Rel.99 functionality (no new features compared to U1.5 content)


U2.1 Features

• STM-1 VC-12 unit for TDM connections over STM-1

• AAL1 over SVC and PVC

• UNI4.0 signalling

• IPSec

• Text Telephony (TTY)

• AAL2 Bearer modification during call (AAL2 signalling CS2)

• ABNF (text) coding for H.248 protocol

• All-IP MGW features • MRFP (Media Resource Function Processor) for All-IP calls• Gi interface support


Further Reading

• MGW U2 Product Description in Marketing intranet or in U2 program Web. Updated in November 2001

• MSC server business program Web: NET homepage --> IP Mobility Networks --> Mobile Core Networks --> MSC Server: - MSC Server Survival Kit (a lot of relevant links collected)- Technical Studies- Technical Training Material

• MGW features training material in U2 Program web site (Company Confidential): MCN --> Product Programs --> Mobile Switching Product Programs --> U2 --> Training

• Feature Web:http://www.net.nokia.com/NET/NWS/MSG/MSCHLR/features.nsf (Company Confifental)- M12 Features- U2 Features- U2.1 Features


Conclusions

• MGW commercially available from U1.5 release onwards, smooth evolution path to upcoming U releases.

• Rel.99 & Rel.4 functionality in the same U2 release.

• Same U2 release fulfills also the known requirements for All-IP networks.

• U2 release for commercial utilization, U2.1 brings some additional features.

Documents

MGWOverview by ziafat ali