NSN LTE Implementation

1 © Nokia Siemens Networks NSN LTE Implementation / Jose Maria Anarte / v2.0 / Document NumberFor public use – IPR applies

NSN LTE ImplementationLTE/EPS Fundamentals Course


Nokia Siemens Networks Academy

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Module Objectives

After completing this module, the participant should be able to:

• Describe the Multiradio solution as the NSN approach to implement the Evolved Node B.

• List different options by NSN to implement the MME.

• Analyze The Flexi Network Server (NS) capacity and configuration.

• Identify the 2 solutions available at NSN to build up the SAE Gateway functionality.

• Discus about the Flexi Network Gateway (NG) capacity and configuration.


Module Contents

• NSN LTE FDD Roadmap

• Flexi Multiradio BTS

• EPC Network Elements and their tasks

• The Mobility Management Entity (MME)

• SAE Gateway

• Appendix: ATCA Platform


Module Contents





• SAE Gateway



LTE FDD Roadmap Overview 2009-2011

High speed BroadbandSelf-Organizing Network

Quality of ServiceAdditional IRAT mobility

Spectral efficiency maximization

MIMO 2x2Intra-frequency mobilityFair schedulerNetAct - FMFlexi System Module: FSMEBandwidth: 5, 10 and 20 MHzFrequency bands• 2600 MHz• 700 MHzEthernet transportSynchronization from GPS

GBR EPS bearerMultiple EPS bearersInter RAT handover to eHRPDNACC to GSMCS fallbackSingle Radio Voice Call Continuity SON• SON NetAct Optimizer – Self

OptimizationBandwidth: 1.4, 3, 15 MHzFrequency bands:• 1900 MHz• 850 MHz• 800EU MHz (Digital Dividend)Up to 6 cells per Flexi BTSIPv4/IPv6 dual stack

Support of higher order MIMO• 4x2• 4x44 way RX divUL Multi User MIMOTTI bundlingActive Antenna SystemsFemto eNBRF sharing WCDMA -LTE RF sharing GSM - LTESystem sharing WCDMA - LTE

Air Interface PerformanceFlat Architecture

Inter RAT handover to WCDMAS1 FlexSON• BTS Auto connectivity• BTS Auto configuration• NetAct Optimizer for LTE• Automatic Neighbor Relation• Self HealingFlexi System Module: FSMD77 km cell rangeFrequency bands• 2100 MHz• 1700/2100 MHz• 1800 MHz• 1500 MHz• 900 MHzSynchronization from Ethernet

RL09 Under Development

RL10Under Planning

RL20Study Items

RL30Research Items

2008 2009 20102007 2Q/2010 4Q/2010 4Q/20114Q/2009

Note: latest LTE roadmap to be derived from

https://inside.nokiasiemensnetworks.com/global/Company/Organisation/COO/RA_index/RA_Roadmaps/Pages/RA

%20PM%20Roadmaps.aspx


Module Contents





• SAE Gateway



Revolutionary Nokia Siemens Networks Flexi BTS platform

Traditional macro BTS

Flexi Multimode BTS

The new BTS offers all the energy saving, low cost deployment and scalability benefits of the Flexi BTS family.


Real life example:

Huge Difference in Conventional Macro BTS site Volume, Weight, Power consumption…

Vendor A Outdoor Macro

Vendor BOutdoor Macro

Vendor COutdoor Macro

Flexi BTS

Note: The Same RF and power configuration


Feederless and distributed sites with RF module or Remote radio headFeederless and distributed sites with RF module or Remote radio head

Flexi Multiradio BTS for HSPA and LTE

Complete 3-sector BTS possible with two modules.Complete 3-sector BTS possible with two modules.

Software Definable Radio TechnologySoftware Definable Radio Technology


Products for Wide Area Deployment

Remote Radio Head (RRH)- each RRH supports a single sector

Flexi Multimode System Module- provides baseband processing capability for

either the Flexi RF Module or RRH

- provides interface to Iub transport network

Flexi 3-sector RF Module- each RF module supports up to 3 sectors

WITH

OR


Flexi Multiradio BTS Modular Site Solution3 Sectors BTS site with optional AC/DC converter and batteries

•One optional outdoor capable Flexi Power Module (FPMA) can house a maximum of four sub-modules:

• One to three optional AC-DC converter sub-modules (FPAA)

• One to three optional battery sub-modules (FPBA)

•One System Module (FSME or FSMD):

– Equipped with transmission sub-module (FTIB or FTLB),

One to four 3-sector RF Modules 210 W 3-sector RF Module has three 70 W Power Amplifiers supporting one, two or three sectors

OR

One to six Flexi Remote RF Heads (RRH)


Flexi Multiradio BTS – Product Concept

System Module

RF Module

SW

Multimode SMEDGE SM

3-sector RF

GSM/EDGE SW WCDMA SW

LTE SW

WCDMA BTS

Multimode SM

3-sector RF

Multimode SM

3-sector RF

LTE BTS

EDGE SM

3-sector RF

GSM BTS

EDGE SM

Multimode SM

3-sector RF

GSM/WCDMA/LTE BTS


NSN Flexi Multiradio BTS - Based Architecture

Baseband processing

RP3

RP1,2 RadioprocessingB

ack

hau

l

BTS Site level functionality: • O&M• Timing/synch• Transport

Flexi BTS RF Modules

Flexi BTS System Module


Flexi BTS System Module – designed for multimode operation

Baseband processing

Radioprocessing

BTS Site level functionality • O&M• Timing/synch• Transport

Flexi BTS Multimode System Module

• HW supports both WCDMA and LTE

• Multiband operation

• Radio Modules for different frequencies can be connected to the same system module

• Multimode functionality support

• WCDMA mode (RU10)

• LTE mode (RL09)

• WCDMA-LTE concurrent mode

Notes: Flexi BTS System Module HW (FSMB) released before RU10 is for WCDMA only. Flexi BTS Multimode System Module variant FSMC HW supports LTE but with limited capacity. FSMD coming later.


Flexi Multimode System Module

• HW: the same HW design is valid for LTE/WCDMA/HSPA/HSPA+

• SW: configurable for LTE/WCDMA/HSPA/HSPA+

Benefit: Easy technology migration through software-based changes.

Baseband (BB) Capacity• One System Module allows different capacity variants of 1, 2 or 3 BB units (Controlled via SW licence)

•1 BB supports:– FSMD version:

▪ 3 LTE cells (<=5 MHz)

▪ 1 LTE cell (10 MHz) + 2Tx MIMO + 2Rx MRC

▪ 1 LTE cell (20MHz) + 1Tx (NO MIMO)

– FSME version:

▪ 3 LTE cells (<=20 MHz) + 2Tx MIMO

▪ 6 LTE cells (<=10 MHz) + 2Tx MIMO


Transmission Sub-Modules (1/2)

Flexi Multiradio BTS backhaul interfaces are provided by field-replaceable Flexi Transport sub-modules which are mounted on top of the Flexi System Module (FSM) core.

One System Module (FSME or FSMD), can be equipped with one of the following transmission sub-module alternatives:

•Hybrid E1/T1/JT1 transmission sub module (FTIB)

•Ethernet transmission sub module (FTLB)


Transmission Sub-Modules (2/2)

FTLB •It can support 2 Gbit/s (DL+UL) throughput including IPSec, taking into account also encryption of the intra-eNB link between the two Flexi System Modules (increases BB capacity).

Flexi Transport sub-modules throughput performance (with IPSec)

FTIB •It is a lower-cost Flexi Transport sub-modules.•It has a 160 Mbit/s throughput performance (DL+UL, with IPSec). •This will be sufficient for very many eNB sites.


Flexi 3-Sector RF Modules – designed for multimode operation

Baseband processing

Radioprocessing

BTS Site level functionality - O&M- Timing/synch- Transport

Flexi 3-Sector RF Module

• HW released in RU10 supports both WCDMA and LTE •Single frequency band, multi-carrier operation•1.4 and 3 MHz LTE carrier bandwidths (5 MHz under study)

• HW released in RU20 supports both WCDMA and LTE•Single band, multi-carrier operation•20 MHz LTE carrier bandwidth

• Multimode functionality support•WCDMA mode (RU10)•LTE mode (RL09)•GSM-WCDMA-LTE concurrent mode (RL20)

Notes: Single and Dual RF Modules (rel.1) are for WCDMA only. Availability of different frequency variants is according to WCDMA/HSPA BTS Site Solution Roadmap.


Flexi 3-Sector RF Module - Introduction

• RF module includes 3 x 70 W Power Amplifiers which provide 60 W output power at the antenna connector

Licensing- RF sector activation license activates 1 sector in 20 W mode

- Possible to have 1 to 3 RF sector activation licenses per RF module

- Additional license keys available for transmit powers of 40, 60 and 8 W

• Provides support for up to 1+1+1 configuration

• One RF Module can be SW activated and configured

to support one LTE cell with 2TX MIMO 60 W + 60 W.

• Same product can be used for WCDMA

• Provides support for up to 20 MHz bandwidth

Licensing- Basic software activation provides support for 1.4 MHz

- Additional license keys available for bandwidths of 3, 5, 10, 15 and 20 MHz


Flexi 3-Sector RF Module

Flexi Three Sector RF Module with 3 x 70 W power amplifiers

is 3 x 60 W at the antenna connector

• 1+1+1 LTE with one RF Module

• Up to 2+2+2 WCDMA with only one RF Module

• Support for Distributed site up to 20 km from System Module (optical connection) DC up to 200 m.

Sector2

Tx & RxSector 3

Tx & RxSector3

Div Rx Sector2

Div Rx Sector

1

Div Rx

Ant6 Ant5 Ant4 Ant3 Ant2 Ant1

Sector1

Tx &

Rx

TX/RX Antenna connector

RX Antenna connector

Optical connections to System Module

DC Power supply input


Optional TMA/MHA

Optional AC/DC + Battery

Multimode System Module

Two 3-sector RF Modules

Flexi Multiradio BTS with MIMO(High Capacity Site) •One System Module

•Two 3-sector RF Modules for 3 sectors

•3 sectors at 120W/sector with 2x2 MIMO and 20MHz bandwidth

•RF Redundancy (implicitly)

•Optional 4 way UL diversity

•Optional TMA/MHAs

Ultimate capacity with 3x120W 2x2 MIMO and 20MHz bandwidth

Sector 1

Sector 3

Sector 2

Tx1/RX1

Tx2/RX2

RX3

RX4


Flexi BTS Remote Radio Head (RRH) – designed for multimode operation

Baseband processing

Radioprocessing

BTS Site level functionality - O&M- Timing/synch- Transport

60W Remote Radio Head• Each RRH supports a single sector

• HW supports both WCDMA and LTE

•Single frequency band, multi-carrier operation

•20 MHz LTE carrier bandwidth

• Multimode functionality support

•WCDMA mode (RU10)

•LTE mode (RL10)

•GSM-WCDMA-LTE concurrent mode (RL20)


Remote Radio Head - Introduction

• Remote Radio Head (RRH) provides 60 W output power at the antenna connector

• 3 RRH are required to support a 1+1+1 configuration

• 30+30 W version of the RRH is required to support MIMO

• Same product can be used for WCDMA

• Physical size is less than 20 litres

• Allows optical link of up to 40 km to the Flexi System module

• Provides support for up to 20 MHz bandwidth

Licensing- Basic software activation provides support for 1.4 MHz

- Additional license keys available for bandwidths of 3, 5, 10, 15 and 20 MHz

Licensing- Basic transmit power capability is 20 W

- Additional license keys available for transmit powers of 40, 60 and 8 W


Remote Radio Head (RRH) 60 W - Summary

SW Configurable Radio Head• Commercial HW shown here • 60 W at antenna connector • Implements 1 sector with up to 4

carriers (total bandwidth is 20MHz)

• all 3GPP frequency bands to be supported according to market need:

• 2.1 GHz, 2.6 GHz, 1.7/2.1 GHz, 700 MHz

• 850 MHz, 900 MHz, 1800 MHz, 1900 MHz

• max. 40 km optical link to BTS System Module

• 200 m DC supply distance • Passive cooling – No Fan• Size: < 20 l (2.1 GHz)

Optional AC/DC with Battery Backup

System Module

RRH

Optical Connection


Evolution from any legacy BTS Flexi LTE BTS co-siting

Migration

FeederCable

TowerMountedAmplifier

AntennaPanel

2G or 3G BTS

Option 1

Existing

or new multiband

antenna

2G or 3G BTS

Flexi RF Module

Flexi System

Combining

Option 2

Existing

or new multiband

antenna

2G or 3G BTS

Combining

Flexi RF Module

Flexi System

Option 3

Feeder Cable

Tower Mounted Amplifier

ExistingAntenna

RRH or RF Module

Optical

New Antenna

2G or 3G BTS

Flexi System


W-CDMA LTE (Flexi installed base)

Migration

FeederCable

TowerMountedAmplifier

AntennaPanel

W-CDMA Flexi

Flexi System

Flexi RF Module

Option 1

2.1GHz or multiband

1.7-2.7GHz antenna

W-CDMA & LTE Flexi

Flexi System

Flexi RF Module

Combining

RF Module LTE

LTE System

Option 2

Feeder Cable

Tower Mounted Amplifier

Antenna Panel

RRH or RF Module

Antenna Panel

Flexi System

Flexi RF Module

LTE System

W-CDMA & LTE Flexi RRH


Introducing LTE - General

2 x 40W1 x 40W

2 x 40W1 x 40W

LTE BTS (2x2 MIMO)

3 x 60W

3 x 60W

3G BTS

3 x 60W3 x 60W3 x 60W LTE BTS

(2x2 MIMO)

3G BTS

3G BTS

• Existing Flexi RF modules can be shared between 3G and LTE

• Requires release 2 RF module hardware

LTE System Module

3 x 60W

3G/LTE RF Module 3G BTS

• New Flexi can be added to existing Node B

• Does not depend upon release version of existing hardware

3 x 60W 3 x 60W3G System Module

• Existing Flexi RF and system modules can be upgraded to LTE

• Requires release 2 RF module hardware

• 3 general approaches to introducing LTE BTS


Module Contents





• SAE Gateway



Evolved Packet Core in 3GPP specifications (according to spec 23.401 & 23.402)

GERAN

UTRAN

Evolved UTRAN

SGSN

MME

Operator IP services:IMS, PSS,…

PCRF

HSS

UE

Serving GW

• User plane anchor for mobility between the 2G/3G access system and the LTE access system

• Lawful Interception

Mobility Management Entity (MME):

• Control Plane traffic handling

• Session and mobility management

• Idle mode mobility management

• Paging

• AAA Proxy

• NAS signaling

PDN GW

• Gateway towards Internet/Intranets

• User plane anchor for mobility between 3GPP and non-3GPP access systems (Home Agent)

• Charging Support

• Policy and Charging Enforcement (Policy and Charging Rules Function communicates with Policy and Charging Enforcement Function within PDN GW)

• Packet Filtering

• Lawful Interception

Serving GW

PDN GW

Policy and ChargingRules Function


Module Contents





• SAE Gateway



NSN MME implementation alternatives

Flexi Multimode BTS DX200 SGSN SAE Gateway

InternetDirect tunnel

MME functionality via SW upgrade

Combi SGSN for existing 2G and 3G networks with DX200 installed base

Flexi Multimode BTS MME SAE Gateway

InternetDirect tunnel

MME functionality in stand alone product Flexi Network Server for new network deployments and early LTE trials


SGSN/MME Product Family

Common DMX Platform• Same O&M

ATCA HW

Pre

-R8

2G/3

G

SG

SN

R8

2G S

GS

N

R8

3G S

GS

N

LTE

MM

E

DX200 HW

SGSN/MME functions can be deployed on two HW variants2G/3G SGSN and Flexi NS use common SW platform and application SW componentsThis is achieved by making SW independent from the HW

Benefits:• From the O&M point of view products

look the same • Application development in one

product can be re-used

Common Server Functionality

• Same Architecture, Subscriber Database, HSS/HLR interface

DX200 HW ATCA HW

SGSN/MME

Flexi Network Server


Gb

Combi SGSN and Flexi NS positioning

DX200: Combined SGSN / MMEMME can be added as SW upgrade to current SGSNs.

Positioned for complex interface environment HW adapts well to different interface variants (FR, ATM, E1/T1, IP)Field proven 2G/3G SGSN with large installed base

ATCA HW: Flexi NSPositioned for All IP and flat architecture environmentHW and SW architecture optimised for high transaction capacity and (e)NB connectivityOnly Ethernet interfacesLeverages combi SGSN SW architecture for reliable LTE MME offering and fast time to market

HLR

IuGGSN

Direct tunnel

GWAll IP(e)NB

RNCNB

BSCFR

ATM IP

E1/T1

Gn

Gr

Flexi NS

combi SGSN/MME


Flexi Network Server 1.0 : Product Concept

•Flexi Network Server Release 1.0 and 1.0 CD2 introduces MME control plane functionality to be used as a part of the NSN LTE offering.•In the first phase Flexi NS is positioned as a stand alone MME element. •However, evolution to a flat architecture 3G SGSN is considered as a natural evolution step in the future. Evolution to become 2G SGSN is more difficult, since user plane forwarding would be needed in that environment. •Flexi NS will be based on NSN ATCA* hardware platform, and build on top of the NSN combi SGSN SW architecture. The idea is that the MME functionality developed in NS1.0 release can be later integrated as a part of the combi SGSN. •The product name Flexi Network Server is still provisional.

*ATCA stands for Advanced Telecommunications Computing Architecture


Flexi Network Server Highlights

High Capacity• 2 M Subscribers• 2 M Bearers• 4.4 K transactions/s• 20 K eNodeBs

MME Functionality• Compliant to 3GPP R8

– Mobility Management– Bearer Management– Authentication

• Based on field proven SGSN SW

Telecom HW Platform• Utilizes ATCA standards designed

for telecommunication environment• 99.999 % Availability and Unit

redundancy• Conformance to environmental

specifications (ETSI, NEBS etc.)


Flexi Network Server Generic Architecture

•Product scales over multiple ATCA chassis– Min configuration within a single chassis– Max configuration one cabinet

• Common HW elements between Flexi Network Server (MME) and Flexi Network Gateway (SAEGW)

– Chassis– Switch– Intel Processor blades

• 16 Slot ATCA Chassis– 1GigE or 10 GiGE external interfaces

• Non-blocking 2x10Gbps switch• Intel processor blades for

– O&M– Chassis SW management– Chassis HW management– MME application


Flexi Network ServerDeployment of MME Functional HW units

PAPU: Packet Processing Unit

• Transaction based mobility management and S1-MME, S3, S10 and S11 interfaces to LTE.

• From 1+1 to 6+1 unitsSMMU: Signalling & Mobility Management Unit• Offer subscriber database and subscriber

state based mobility management.• Offers S6a interface in LTE• From 1+1 to 2+1 unitMCHU: Marker & Charging Unit• Offer statistic functionalities• 2n unitOMU: O&M Unit• Operation and maintenance functionality

and interface.• 2n unit

PA

PU

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CH

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PA

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Sw

itch

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UP

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Flexi NS

EthernetEthernet

SMMU(n+1)

PAPU(n+1)

OMU(2n)

S11, S4,

S3

S1-MME,

S6a

O&M

MCHU(2n)


Flexi Network ServerPhysical interfaces for external connectivity

PAPU: Packet Processing Unit

• 2 x 1000Base-T, RJ-45SMMU: Signalling & Mobility Management Unit• 2 x 1000Base-T, RJ-45MCHU: Marker & Charging Unit• 2 x 1000Base-T, RJ-45OMU: O&M Unit• 2 x 1000Base-T, RJ-45Switch:• 4 x 10GBase-SX/LX/EX, XFP

– (Not used at first)

Interface Standards: • 1x1000BASE-T: IEEE 802.3ab• 10GBase-SX/LX/EX: IEEE 802.3ae

PA

PU

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PA

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MU

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Flexi NS


Combi SGSN with MME functionality

Nokia SGSN will evolve to MME in LTE.

MME offers control plane functionalities like Mobility Management and Authentications for LTE network.

SGSN MME offers multiaccess combi element:

• 2G, 3G, I-HSPA and LTE support

Benefits• Very cost efficient way for customers to get MME into their network.• Provides the possibility for tightly integrated SGSN/MME network element

with optimal support for 3G-LTE intersystem mobility.• Extensive feature set: many of the existing SGSN features can be

applicable for LTE access as well.• MME is based on field proved SGSN software and the DX200 platform

hardware.

RAN SGSNMME

User planeControl plane

GGSN /SAE GW

2G/EDGE

3G/HSPA

LTE

I-HSPA


Combi SGSN / MME Evolution Plan

2008 2009 2010 2011 2012

SGSN

Flexi Network Server

SG8Commercial MME

Commercial MME

SG9VoIP services

Trial MME VoIP services

Standalone MME element

Combined 2G / 3G / MME element

SG7.0High Capacity SGSN


MME Capacity Roadmap


Module Contents





• SAE Gateway



Service Aware GGSN / LTE Gateway Evolution Plan

2008 2009 2010 2011

Flexi ISN

Flexi Network Gateway

HSPA+solutions

Commercial LTE launch;

serviceaware policyenforcement

3GPP rel 7 PCC (Gx)

Mobile broadband gateway –

SAE GW entry

Large scale LTE

deployment; Operator VoIP

Mature, feature-rich GGSN serving the 2G/HSPA operator needs, LTE Support

Capacity leapfor HSPA

High capacity mobile broadband gateway

LTE Support (PDN-GW)


Flexi Network Gateway (Flexi NG)as Serving GW and PDN GW

Leading throughput for LTE– Strong hardware evolution within ATCA industry– Best-in-class performance for data and VoIP

Flexible performance – Same hardware and software can be configured

and optimized for different deployment scenariosScalability

– Multiple shelf variants, scalable architecture– Both centralised and distributed deployment

modelsFeature-rich

– Early availability of HSPA and LTE feature sets– Strong policy enforcement support

Design for Serviceability– 2n configurations for high availability and

maintainability– In-service software updates


Flexi Network Gateway Overview

• Common gateway offering service connectivity for 3GPP and non 3GPP access

• Scales from slim entry to 480Gbps– Up to 16 blades in a chassis

– Up to 12 M PDP contexts

Common gateway functionality

Nokia Siemens NetworksFlexiPlatform

ATCA bladeMulti-core packet processors

S-G

W a

nd P

-GW

fo

r LT

E

Hig

h ca

paci

ty G

GS

N

for

2G/3

G/H

SP

A/

I-H

SP

A

Ser

vice

aw

aren

ess

Pol

icy

enfo

rcem

ent


Flexi Network GatewaySAE GW for LTE

SAE-GW is split into two logical elements – Serving GW and PDN- GW.

• S-GW provides – User plane interface towards LTE radio

network

– Mobility anchoring for eNodeB changes

– Roaming in a visited network

• P-GW provides

– Mobility anchoring for LTE/ Non-3GPP IP Access interworking

– Policy enforcement, charging and Service awareness

– Lawful interception

– IP address allocation and binding

PCRF

AAA

eNodeB

MME

ePDG(non 3GPP IP Access)

Services

Implementation options:

• Integrated S-GW/P-GW or

• Standalone S-GW and P-GW.

• Connectivity with either GTP or PMIP based S5.

NSN SAE GW solution

SGW PGW


Flexi NG scalability and capacity

Capacity per Service BladeRel NG 10: • 10 Gbps throughput• 600k Bearer• 3k transaction/s

Rel NG 20:• 40 Gbps throughput• 1M Bearer• 9 k transaction/s

Capacity per element (N)Rel NG 10: • 120 Gbps throughput• 7.2 M Bearer• 36k transaction/sRel NG20:• 480 Gbps throughput• 12 M Bearer• 108k transaction/s

Minimum configuration:

• 2 Service Blades

Linear scaling by adding Service Blades

Maximum configuration:

• 12 Service Blades


Module Contents





• SAE Gateway



Why NSN has chosen ATCA for LTE Core? 1/3

• Existing Functionality from Combi-SGSN and Flexi ISN is inherited to LTE core

– Stability, Carrier Gradeness– Kick start for functionality

• Cost savings in HW development:– Use of COTS HW (Commercial off-the-shelf

HW)when applicable– Design Subcontracting (NSN IPR)

• Technology updates are available without NSN own investment

▪ NSN can choose best available technology



•HW Lifecycle management– COTS technology usage brings new HW to the

field one year earlier compared to dedicated own HW development

▪ Longer HW lifecycle in live networks▪ HW upgrades needed more seldom▪ Savings in spare parts▪ Savings in platform and product testing▪ Savings in HW type approvals

• ATCA generations– 1. generations in initial deployments 2002-2005– 2. generation 2006-2007– 3. generation 2008 –

• NSN will use latest ATCA technology



• HW components can be shared both with MME and with SAEGW

• Superior Scalability for LTE core– MME can scale over multiple chassis– Inter chassis redundancy for GW– Scalable chassis from 16 slots down to 6 slots

and 2 slots

NSN LTE Implementation

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