lte webinar sept2012 rev2 final

7/28/2019 Lte Webinar Sept2012 Rev2 Final

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Meeting the Demands of LTE

LTE Test Webinar:


A Test & Measurement World

Editorial Webcast


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Meeting the Demands of LTE Meeting the Demands of LTE

Brought to you by:


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Meeting the Demands of LTE Meeting the Demands of LTE

Welcome!

Todays Panelists are:

Chris Pearson, 4G Americas

Ngwa Shusina, Aeroflex Janine Love, Moderator for T&MW


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Meeting the Demands of LTEMeeting the Demands of LTE

Welcome!

Briefly set the stage for us. What is the global

status of mobile broadband including HSPA+,

LTE, LTE-A? How close are we to actually

achieving the anticipated performance?


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Mobile Broadband Deployment Status

www.4gamericas.org

476 networks in 181 countries

HSPA

233 networks in 113 countries 143 @21 Mbps - 7 @ 28 Mbps - 83@42 Mbps

HSPA+

100 networks in 49 countries

342 networks planned or in trial

LTE

Launches planned for 2013

LTE-Advanced


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What are operators major challenges ?


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What technical advancements are

enabling progress in mobile broadband?


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Meeting the Demands of LTETechnology Evolution

LTE-Advanced Brings Multiple Improvements

Leverage wider

bandwidth

Leverage more radio links,

more antennas

Leverage heterogeneousnetwork topology

(HetNet)

Small cell deployments (femto, pico,

micro) using advanced interference

management

Carrier aggregation across multiple

carriers and multiple bands

Downlink MIMO up to 8x8, Enhanced Multi User MIMO

Uplink MIMO up to 4x4

www.4gamericas.org

LTE-Advanced


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Many designers are working with MIMO for

the first time, what are some of the specificchallenges they face?


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UE-IDy

1st in

depe

ndentd

atastream

Cell-ID A

2ndin

depe

ndentd

atastream

2 Receive

antennas

2 transmit

antennas

MIMO Overview

Allows multiple streams to be transmitted

at the same time. Can be Downlink (DL)

or Uplink (UL).

Enables increased data rates i.e. 300Mbps

in DL for Rel-8/9 UEs using 4x4 technology

in the Downlink.

MIMO was also introduced in the UL for

Rel-10 UEs and can support up 4x4.

When is MIMO used

Used to better manage network

resources, e.g. MIMO in preference of

more component carriers for Rel-10 UEs

MIMO is enabled when the channel

conditions are sufficiently good i.e. good

SNR conditions


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Meeting the Demands of LTE MIMO challenges

The eNobeB has to select parameters that provide optimum conditions

to enable peak data rates. The parameter selection is vendor specificand so the algorithms used can affect overall performance.

o How do the algorithms react to the channel status information from the

UE.

o Do the algorithms work well in low, medium and high mobility conditions.

What is the performance with different system bandwidths?

How do we overcome MIMO challenges

Having the right test equipment is key:

o Rich test features e.g. provision to override channel status parameters

from the UE to adequately test the eNodeB algorithms.o Provision of realistic channel conditions to emulate the channel conditions

seen between the eNodeB and UE.


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When testing an LTE product or network,

how do you predict how a system willbehave?


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Single UE10-100s

of UEs1000s of UEs

Unpredictability of network behaviour becomes more likely as number of

UEs increase

Challenges of predicting network behavior

Network behavior can reasonably be predicted in lab conditions and if a

small number of UEs are attached to the network. The unpredictability of network behavior rises in high load conditions;

notably in the following scenarios:

o Millions of M2M devises attached to the network.

o Thousands of UEs attached to the network and running different

applications e.g. VoIP, HTTP, FTP.

o UEs are influenced by different mobility conditions.

h d f


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What can we do to manageunpredictability?

i h d f


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Meeting the Demands of LTE Testing, testing, testing!!!

Emulate test scenarios that can cause unpredictable behaviour e.g.

o High numbers of UEs trying to connect to the network at the same time.

o High numbers of handovers with same and different RATs

Simply emulating is not enough!

o Need to use Real world conditions e.g. use Real world traffic profiles that are

configurable and can be applied differently per UE.

o Emulate realistic channel/mobility conditions that will stress test the networkperformance

Does the testing provide key information to identify network issues?

o A rich set of low & high level KPIs are necessary to identify problems e.g. at the

UE and cell level

o KPIs should be presented is a way that can enable faster trouble-shooting.

o A myriad of test features are necessary for good test coverage.

M i h D d f LTE


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What should be a design team's major

concerns when testing/debugging aLTE/LTE-A system before field trials?

M ti th D d f LTE


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Meeting the Demands of LTE Testing LTE/LTE-A ahead of field trials

LTE/LTE-A consists of several layers of complexity

o Lower and higher layers respectively concerned with the modulation/demodulation and

signalling between the UE and network.

Each layer needs to be tested individually

o Functional testing first in lab conditions to identify software and hardware bugs and also

discrepancies with the 3GPP standard.

Testing all layers

o This enables testing as a system to ensure correct inter-operability between the layers.

o Testing in the lab does not always highlight problems experienced in field trials!

Testing in realistic & Real world conditions.

o This is a very important step that eventually determines the behaviour and performance

of the system in the field.

o A major concern is having the right test equipment with adequate test features toreproduce Real World conditions and stress test the network, thereby emulating true

conditions experienced in the field.

M ti th D d f LTE

M ti th D d f LTE


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Questions ?

Time for Todays Live Q&A

LTE Test Webinar:Meeting the Demands of LTE

M ti th D d f LTEM ti th D d f LTE


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Abo ut A erof lex

Aeroflex Incorporated is a leading global provider of high performancemicroelectronic components and test and measurement equipment used by

companies in the space, avionics, defense, commercial wireless communications,

medical and other markets.

Abou t Aero flex LTE and LTE-A Expert iseAeroflex LTE leadership started with the delivery of test systems in 2007 and

now continues with a complete range of end-to-end test systems that cover R&D,

performance, service, and manufacturing test applications for LTE TDD and FDD

network equipment and terminals.



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Thank you!

Thanks to our speakers today:

Chris Pearson, 4G Americas.

Ngwa Shusina, Aeroflex

Janine Love, Moderator for T&MW

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Thanks for attending todays T&MW Editorial Event:

LTE Test Webinar: Meeting the Demands of LTE

lte webinar sept2012 rev2 final

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