08 eloadas maghalozat evolucioja (1)

8/18/2019 08 Eloadas Maghalozat Evolucioja (1)

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©2013 Nokia Solutions and Networks. All rights reserv

Nokia Networks

Core network evolution

Nokia implementation


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©2015 Nokia Solutions and Networks. All rights reserved. 05-03-2015

NSN Budapest Technical Support Bertók Zoltán For BME only

• R99 architecture

• DX MSCi

• R4 architecture

• IPA2800 MGW

• Open MSS

• Open MGW

• MSSs in pool

Core network presentation


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R99 architecture

BSC

HLR

MSCMSC A

ISUP

IN

TC

GSM


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CCMU CMU CM VLRU STU CHU OMU

PAU CASU LSU IWCU BSU CCSU M BDCU

GSWGroup Switch

X.25/LAN toAdC, NMS, SMSC,BC, Traffica...

CNF

CLS

ET

ETECU

...and/or other data pools

CDSU

ETBSSBase Station

Subsystem

TGFP

2n

n+1 n+1 n+1 2nn+1 n+1

2nn+1/C

2n 2n 2n 2n 2n 2n (2n)

...or ANM via E

MB Message Bus

VANG

2n

DX MSC/MSS


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DX MSCiThe OMU handles all centralized supervision, alarm a

functions, and the connections towards user interface

The OMU has dedicated storage devices, for exampl

software of the network element

The CMU controls the cellular radio network.

The central memory (CM) handles the routing functio

also contains all system configuration data and maste

distributed files.

The Marker (M)controls and supervises the GSW, hu

and is responsible for establishing and releasing all c

CLS generate the clock signals necessary for synchr

The MB is the physical connection between the comp

controlled by the Message Bus Interface plug-in units

EMB: ethernet based message bus.


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The BSU handles BSSAP and RANAP signaling betw

the BSC/RNC

CCSU handles CCS7 signaling functions for the exte

towards the other network elements in the MSS. Sign

between the MSS network elements can also be carrnetwork with SIGTRAN

CCSM handles the central part of CCS7 signaling ma

states. (this function moved to CM nowadays)

PAU handles signaling for PBX.

The Charging Unit collects and stores charging data.

GSW: Switching fabric of the MSS

The VLRU contains information about each subscribe

being served by the MSS.

DX MSCi


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Redundancy

• 2N providing duplication

The spare unit is in hot-standby mode, and when a failure occurs in an active unit, the switchover to the spare unit is ver

• N+1 replacement principle

One spare unit is designated to a group of functional units. One spare unit can replace any unit in the group. In this case

slower because the spare unit is synchronized as part of the switchover procedure (also called as “(warming)”). The spa

by mode.

• N+1/L load sharing principle

A unit group has no allocated spare unit and the group acts as a resource pool. The number of units in the pool is select

is redundant capacity. If some units of the pool are disabled because of faults, the whole group can still perform its desig

• N principle

The network element has several functional units and several network connections, but no replacement or load sharing

• SN+ principle

Load sharing without any spare redundant functional unit. Extra computer unit(s) can be reserved if needed so that the s

failure of one unit by utilizing the remaining units.

Power redundancy

• The system has two – fully redundant – power supply, which is distributed in and among the cabinets.

• The 2n redundant units get the power from different source


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R4 architecture

RNC

BSC

MGW

IP/ATM/TDM

BackboneMGW

HLR

MSC ServerMSC Server

WCDMA

A

A

Iu-CS

SIGTRAN

H.248H.248

BICC, SIP-I, ISUP

IN/SCE APSE

TC

Ater

GSM

Nb/Nb’*

Nb/Nb’*


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R4

• In 3GPP Rel’4 network architecture, the user plane and control plane are separated.

In practice this means that the control functions are handled by MSC Server and user plane functio

• MSC Server system provides a packet based transport (IP/ATM) for both signaling and user plane.

operators a smooth migration path from the 2nd generation mobile networks towards the 3rd generat

minimal investments.

• The circuit-switched core network can be also seen as an intermediate step towards an IP multimed

subsystem. This also makes the MSC Server system ideal for new operators.

• In addition to the standard Rel’4 architecture, the Nokia MSS system provides the proprietary “2G tr

(Ater) functionality (with Nokia BSS), as well as proprietary Nb’ interface between the Nokia MGWs


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MSS

Iu / ATMCP

MSS

Iu CS (ATM/IP)

A (TDM/IP)/ Ater (TDM)

Nb (ATM/IP/TDM) /Nb’ (IP)/Nb(SIP-I)(IP)

Mc (IP)

Mc (

SIGT

Iu/ ATM

Transp. Net.

CP

Iu /ATM

UP

Codec

Iu UP

AAL2

ATM

AAL2 SIG

STC

MTP3b

SSCF-NNI

SSCOP

AAL5

ATM

RANAP

SCCPb

MTP3b

SSCF-NNI

SSCOP

AAL5

ATM

Transp. Net

CP

AAL2 SIG

STCMTP3b

SSCF-NNI

SSCOP

AAL5

ATM

Nb / IP

UP

Codec

Nb UP

RTP

UDP

IP

Nb / ATM

UP

Codec

Nb UP

AAL2

ATM

Nb / TDM

UP

Codec

H.248

H.248

SCTP/(TCP)

IP

BSSAP

SCCP

M3UA

SCTP

IP

RANAP

SCCPB

M3UA

SCTP

IP

ISUP

M3UA

SCTP

IP

SIGTRAN (IP)

Nb’ / IP

UPCodec

RTP

UDP

IP

A int /TDM

CP

BSSAP

SCCP

MTP3

MTP2

A / TDM

UP

Codec

30B+D (TDM)

Q.931

Q.921

30B+D

CP 30B+D

UP

G.711

Q.931

IUA

SCTP

IP

IWF control

SCTP/TCP

IP

IWF

interface

Iu / IPUP

Codec

Iu UP

RTP

UDP

IP

A / IP

UP

Codec

RTP

UDP

IP

Nb (SIP-I) / IP

UP

IWF

UP /TDM

Codec

IWFCP /IP

MGW1MGW2

BSC

RNC

(Fixed)PBX

The main functions of the MGW


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The main functions of the MGW

The Nokia Multimedia Gateway product can be used for transmitting and converting the user plane traffic in both bearer inde

Switched core network (MSC server environment) and IP based networks.

Between different kind of networks the MGW acts as a border element whose main functions are:

1) User plane transport;

- Under control of MSC Server (via H.248 protocol), MGW terminates the user plane from different kind of interfa

conversion between TDM, ATM and IP transmission technologies and connects the user plane between acces

2) Media Processing;

- MGW provides needed media processing functions like transcoding, Echo Cancelling, Automatic Level Contro

Announcements, as well as Conference Call functionality.

3) Signaling Transport;

- MGW adapts the conventional signaling (control plane) between MSC server and different network interfaces b

transport layer (without affecting the signaling application layers).


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MXU

SFU

MXU

NPS1P

IWS1

8*STM-1/

(ATM)- “ATM E

2*Gigabit

Ethernet (

– “IP EIPU

TBU

Control interface

towards MSS,

O&M interface

towards NetAct.

Switching functions

Interface functions

Control functions

Signal processing

System functions

MXU

VANUNIWUTCU

VANUCM

VANUCACU

VANUVANU

VANUNIWUISU

VANUOMU

VANUWDU

SWUNEMU

VANUHarddisk

USB

device

NIWU

NIP1

EHU

NPGEP

up to

1.65 Gbit/s

per port

up to

160 M

per po

IPA2800 MGW


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SFU:40Gbit/s unblocked ATM cell switching capacit

MXU: 1.6Gbit/s Multiplexer plug-in unit

The Control and Administrative Computer Unit (

centralized parts of ATM switching platform function

connection control, resource management, addressrouting.

The Interface Signaling Unit (ISU) performs the sig

tasks of MGW. They are the message Transfer Part

Signaling Connection Control Part (SCCP) of SS7, S

functionalities (SCTP, M3UA), H.248 protocol, UNI s

and BSSAP transport.

The task of the AAL2 Switching Unit (A2SU) is to and multiplexing of AAL2 CPS packets between exte

and signal processing units


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Interface cards and DSP

NPGEP: IP over ethernet interface

NPS1 :ATM / IPoA network interface plug-in unit

NIWU:TDM network interface with 16 electrical inte

IWS1E: TDM network interface with 1 optical interfa

TCU: performs tasks related to processing of traffic

user plane (speech transcoding, circuit switched


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R4 MSS


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Virtualization is a technology to create a virtua

environment what can execute a guest OS an

applications

Several types of unites are created on top of

machines

It is only configuration to allocate more cores

memory or any HW resource to a guest.

Virtualization in Open MSS

FI BI, between


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RTMRTM

RTMRTM

RTM

RTM storage

O&M

OMU

H

u

b

FI BI, between

shelves

RTM

RTM storage

CHU

VMU

IPDU

CMM

Billing

GISU

VLRU

STU

CMU

OLCM

Control plane


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CPU blades for SUs, OMU, CM, V

AHUB blade:

BI/FI interface: MB, and external in

The Virtualization Manager Unit is

acting as host system for providing

abstraction layer which virtualizes

units like GISU, VLRU, STU and C

IPDU: IP director unit as load balan

Open MSS HW layout


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RTM TD

RTMCPRT4-A storage

O&M

IP signaling

CLA(ACPI4-A)

ISU(ACPI4-A)

TCU

(ADSP1-A)

H

u

b

AMCCarrier ACAR1-B

IPNI10PIP/10GE(MPPAM-B)

TDMNIP(SCNAM-B)

BI

FI ADDF

RTMHBRT3-A

Sync. Clock

IPNI1P

IP/GE(MPPAM-C)

AHUB3-A

Open MGW


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TCU containing the DSPs.

ISU acts as signaling unit

CLA node as signaling and O&M unit

IPNI1(0)P/ TDMNIP are IP and TDM interface ca

AHUB is the BI and FI interface for internal messsignaling.

ADDF: external TDM multiplexer

Open MGW HW layout


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MSS in pool concept

•Subscribers are equally shared a

•Number of inter VLR location up

•Number of inter MSS handovers

•Signaling load decrease

•On-load/off load option

•Disaster safe

•SW upgrade help


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MML – Man Machine Language

•MML is command interface to MS

•Hierarchical structure

•Menu based

•Guides the user step by step

08 eloadas maghalozat evolucioja (1)

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