Testing and Optimizing LTE

8/3/2019 Testing and Optimizing LTE

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Ilr derstandlnq what' are. he lmpor an 'parameters to measure to help optimizean LT, , Network



ets Learn as an In....• strv LS II

• LTE can deliver performance apprcachinq theoretical limits- In a singlle cel l , with a s in q le UE in a pure IR F e nv iro n m e n t

• True end-user realized performance will be very differentT1 h 'e 're o'wl~IIII '1b e ' ne 'I~ Ig 'h ' ' .bo r c '."" 11 - 11&.- . . . o th oe 'r I I~I 'n e o r 't- e' r 'e "'.nce s O IUr c " e " s., 1 < ,: 1 , .[ H --III i:; , · - ·- I_ I- . 'I ,~ ,--- " , .- , ..-- 1 ,1 -1 ,1 I ' -"1 '-_< I < ~ '

- Most users w iU not be near the base station

- IR ·· · -.d•• · · ,I I~ :O.-•• . ·: r · · ·e · · · · . · s · · · - -o · . ' · -•· . u '· · c : - · l e · . - - · · · · · s · · · . · ~ · · · · -a , · · 'n"d•···- 'le ,1 1 1 1 th ro u .. ·g:- .h P' . · . - IU· . .t · -- :w· · · i i I11 jb -11

8.·- .-- ,s · · · . · - - · · · ·.h a re .•· . · ·d by m · - · · : ·_, a · .n · · · · y 'IU · ·s · · · . ·~ · · · · · le · . - · - : r · :s . · · · . ·~ · · . -' 1" " _' ,_, ' _ " _' _ ' " . _ I" ! ' . , _ _ . __ : _ I . ' __ I .11, ~ , . , . _. " _ _. I .. " . . ,_ , " ... - . . .

• Trial test plans need to find true end-user performance notmaximum possible eNB performance

' Te "stlnq w · lth o n e o r tw o UIE's [~ I [S - 'n · ·o · t - ·- n o 'u g 'h" c o n sldar a's many a s te n '

• There is more to measure than just throughput- Consiider C-P llanelatency essen tial to provide an"always on"

e x' p. ' . r l e ' n 'C '"e ' ·wh ' .[11' 111" rn. '.[II:n III:m [ I ~ I: Z ! I !! I ''gill0 a "d III:n · t · h · ·e' C O .e -1 1 1 1 1> . '1 . [ • .. .. - ' • . - . . ,; , ' - ,. .. .,~ , '· I I[ : ', [ II> [, '-" ':1 [ .-- '1,- '1

e 2011 J DS Umphase Corporatlon I J DS LJCON FlDENTIAL AN D P RO P R IETA RV I NFORMATto N



Air Interface Challengles

......... . . . . . .

- ..~

• RF 'Coverage• RF Quality• Handover

• Scheduling'. Throuq..hput.. . . < . . .. I . .. ..

• User Appllcation Performance• Throuq•.••·put... •.. I····

• Latency

'. Harmonization

• Efficient use of resources'. In,ter-IR"ATHandover




....an 'the Control-Plane Challen'Qles

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• 1 0p r O V [ I " , - errany u s e r s W litr Ian a .ways-enexperience, LTE is desiqned wlith.a [ow id e to,ac ,'ve transi tion time

Aill1 1 IIE it i , idl t t - h h ,. d t ti

• . , u S Sill u n la ln '- es , ' " a , I : ' e ·w - -e ·[n "- I l e r eI I , S ,nlO :: a.18 110transfer - but can be activated quickly when theyneed t IO:": '~:O::.rn,',- un iicate

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I Measured C-Plane latency is in line with 3GPP target of 1DOms I




• A basic IMSI attach involves:

- ' 6 1+lntertaces__ 8+ 'P irotoco ls

- , " 9 ::+ 'Transactions.... ····. .... - - . . I

• M obiiIlityiincreases complexity:-, MME / SGW IR,le,!locations

-, .2:G I-RAT

- 3G I-RAT~ , C,S -Fa lback

1 '1takes the who e end to end network to de iver anapplication/service to the end user.




Meas'uring Accessibility, M ,o ...ility and Retalnablllty

• LT'E lntroduces 1 O 'O S ,,o,fnew transactions t h a t are u sed in'1O s o f:p ro ce du re s th at co ntro l th e u se rse xp erie nce a ro un daccessib · ~ · t - ' -mobilit - and retalnabltlt- ':_ :~ ~,i " ,:,1 1 , 1 1 1 1 1y ~ , "1 ,' ,. , · . ' .11II 'IY ' - . :',,".r ' , ~ I , -, ', .1 , '- , ', ,' , , ', .I I 1 1 '1Y

How do you ,e l ff le l ic t ivls l l :yrnanaqe your-network service and'C- is to rn e r' experie - n c's " w h e n' t -h- ''9 ' S 's " t- o " f- - m '9 " a 's u re ' -m e 'mts C O ' " -tldU,<, > " '" ,., IJ(I':II L~: " W ': ' I" ,· 1 , ., '" .I I ~ ' , , ' ,< . : i:" , ',.~: 'U <

r u n in to th e 1 1IO'O : , 8 ? '

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, 5 r i1 !-AIU1nelillIJt:~~iolllf :S !i~ if~ Y I." -- -- - --- --- -_, _, _"_'. " - - - - - -__,,_,,_ , _ , _,_ - --- - - --- _, - _ , _ , _ , , _ ,__ ,_ - - - - - - -- - - .i S h . i d el 1 ll i :l y F l ra ql .Ei $t !R I8 ~j: ;JO ~ !$ " _ _ __ , .1 , ',_- '- - _ - _ _ ' _ ' 'I -" -'- '- - - - -+f+,~~,~_E... ~~n!',~V,..c!~~\.

I[. Ci;nha1red On1toIi~ R 8 ( 1 u e $ ~

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Tak e as, a,n ,ex am ple o n,s 'procedure th e Attach Procedure>

.1 T lh e a tt ac h p ro ce d u re includes 19 separate, transactionsbefore th e US91r is,able to ,B'CC:9SS,services

• B 'yr n an a q in q P r oc ed u rebasedl K,PI~s4a tt ach procedureK P ~ ls c a nreplace 7 -6measurements ( 11 ' 9 !x 4):-1 11. u. ' '_ '_ '_ ,_ E c__ _"_=_= _=E_""

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Attach Procedure Volume'

A tt ac h P r oc ed u re I E ,r r, orRat:!9(broken down b y transaction a n d c au s e]

A tt ac h P r oc ed u re Absence

Attach Procedure Setup Time

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2'1_ LIi 8 -C~ 'rr'~ Slar,2'.2:.Attacn C- 'I piate

• T lh e a n sw e r t he re fo re I'SC o m p os it e K ,P ~ s re p or ti n qDin ksyp ro ce du r e p e rf or m an c e and qualitv Ib'ycorrelatlnqm e as ure m en t in to rrn a tio n a cro ssinterf'a,ces, transactionsan d protocols and' linked to the , actual customer experiencerather t - - I -h 'an transaction q alit'I ,~I ' - - ' - -~ ' I· ~ _ . I 'I -1 , I I • . • . • .• . . . ,IU: - .III 'Y, . ,

Be selective ... what ad how you measure perfo mace to heiR }'O,U

optimize your ..etwo ke 2011 J DS Umphase Corporatlon I J DS LJCON FlDE NTIAL AN D P RO P R IETA RV INFORMAT to N



,xpandin'golicy management andcon' rol to op Irnlze LTE traffic



E d P··· ·1 M - t .1 It 1.1xpan c e'Q ICY .. anagemen t "-0 p rO V 11e a .erna ives

to 'fla' rate tarltts and ontlmlze 1' 1 E II raffle• Research shows that fllatrate ta ri ff s, wi l linot continue

in a 14 'Gworld,

• B y expanding policy management and controls,operators can develop smarter charging plans thatwilli provide them with a sustainable revenue stream, sm.

• Examples of:smarter charqlnq plans are alreadyappeariing in the ILTE seg.ment . These poliiciiescanb e u s e d- t IO""rn a "x lm ls e · ·· ··e v en ue s...w i t h Ih~lg'h v a· I · -u-e · · ·~, , I> : ' . :" ,>1, ' , I, ' .. .• . .. ' _ , , , , ' '..'~ I . '. ', '.~ '" ..' , ' • . .• .• . . : " , , ', ,'• • . , . ,: .., '

customers.

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• But policy rnanaqernent can also be used as thernechanisrn to im proved cu stom er service an dprovide the ability to shape tra tflc o ntheir mobileb ro a dba n d -n 'e '"tw 0 " " " "rks' .' . ' : . .! . " .: _' . . : . ". . .. . I . " . . . " . . i . . . .. . ~ . "t

N;i:ii'll

• II-f- .. . . - . . '1 M " " N ' ·· · ··0' -. . " . .''-f l ' - - : . . ' ., ' - -' " '" . ," ........• ' .. ' " , ' ... "t'.' "',,....'.~,.1 -. "" - t ~ - ' ~ " . - -k ~ _ .. ' ' ,,-ani. ',"> o ers access 11 0 S O C l,a n e w o rlln gI d I d f '~ d !~ d -I I ~

" '. -. _ _ ~ -.' ' .. 1_ - -"- - - " " .' . ' . . : ' .. - -, - -, " .. ', ' .: _ . .. ' ' . - - - . ', ' : " -L -. -, - . ' . ' . - -, ' ' ' . . ' . - _ . - - -services I urlnlg, a,r, e IIn l8 per~ o .. at a ow ercost, Itcan make lts service more affordable and attractlveto users, m ove traffic to off-peak p eriiodsandincrease quality of service an d cu stom er exp erien ceacro ss its operation.




Policy Based Ma-agemen't in L E

00 S P rofliile+ !Beare riD

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Bearer

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• LTE QoS Cllass IdenUfiers (aCI) could be used for prioritization ofspeclrlc services according to operator confiquratlon

• Q IG IIis a labell that is applied to the EIPSbearer, so that EPC and LTEnodes can prioritize packet scheduUng in order to meet OoS targets forth e e lla ,s ,s ,~

• Q IG IIcan be used to manage - bit rate (GBR, MBR,APN-AMBR), latencyand p a c l k e tI I o S 8r a' te" '. '.. .' 1 _ " , ', -< -, ' - ',-=

However ILTEQoS is Oornplex• Many OoS classes enforced by8-GW

U ln to 2' : '4 '1bearers ln the en 'd to en d chain~ I .•• ', . '~ ~. .- ,- -1 - I .. . .II ," '-~ , :, " ," .' '.~ ' -, - I I I . ., 'e 2011 J DS Umphase Corporatlon I J DSU ~ONF~DE NTIAL AND PROPRIETARYIN FORMAT lO N



ab I lest Case - Q'oS differentiation, Policy Control& Charging

QoS overhead provlslonlnq analysis including Policy Contrail and Charging

• Compare the cell capacity first without and then with the QoS provisioned for thebandwidth that can be delivered to understand the actual impact on the overalll cellcapacity. Then compare, step by step, the, overalllimpact of:user mobility on cellc aipaclty a n "1d · · . · · · 1q u a ran· · t -e · . - , s ·_ ·d · · . · · ·o."~- . , · -. "."." .. ' ' . III : . . ' '. <. . '. '''. , '.: .., '. ." . '. - . . .' "." •

• Validate that the proper parameters where including in the Charging ~nformation

• Test cas 'e praces's" . " . . ". " ."

- , ..•• .• . .... • ....• :~ ' _ ". I-' '< . '

- ,S etu p a statlc multi-user ce U d ow n lo ad w ith1 6 ,to 10 u sers pertormlnq full-butterdownloads.

- Measure t lhe overall cell capacitv

- RI8'a,s,s'iglnIOllneuser as,8 mobile user wlth a fixed-rate U I , D , Pstream with!the S,,8Ime rneqablt-!P I18 'I r - S e C ' O l n d lrate that w as achieved in ,t he fu ll -bufferdownload,

.. S18 · tth e O o S p aram eters tortltlisIUS,lerto match th e fixed rate ot th is ,UDP stream,

• Vertfy tlhat the throuqhput rate is in th e ran ee 1 0 1 f :2: to 5 Mlbps

M-e a 's - rr st - Ih-"e 0- -e t " ' l a~1c e l l capacity_ - . ·u . ' '~ . . .~ "v~I e;

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Control & Charging

1 1

M INI,O · •.· · · · : ' s · · · . · · · · · · ·n· · · · e .~ .__ ,e - Id , ·• · · ·t -10. · · · · · • • · •ec1n ' "s · . · · · ' u · · - r · · · , e · · · - - · · ·_ - · ,' -u · s to m "" . _e- - r ' e-~ ,x . · · . - ·p· · ·. · ·· le - - ,r · l e n ' c ·· · ·· · ·· ,e · · ·· · ·· · ·· · ·e · · - -v · , . · · : : · e · · · . · · . · · . l l s · · · · . · · · · · · · ·~ -r · · ' e · · . · · . · · · ·-m. : · ' : · · · · , a · '-n ·_ - ' . - · a~ . · · g · . - e · ·~ - ,p · · . : : , - r · o · · · · ' • •a c tiv e .. ' ,- y ' ~ a · · · · ' · · ·s·-" ' ' - ' - · ·" ', . " . " ," I : " . '. " ,"- . ,. . .. . 1 ,- '. , I ." , ' , , " . " .- .' ..' ', ': "" " , ', ', ', I, ' . . '. , " " " ,' '" , .; ,' " "

d~ffering service e ve lls a re offered to different customer segments (e.g. VI,P)M 'N'"0 " '," need' t-o rn e a ' s ure o th e re q u e s t s e rv l· lc e · 'Ie v e ll a q a i nst · tlh e rece~vedl s e rvice~ ,e,vell- QCI ,81L A

However QCI and Po icy control values only appear in the control plane intransacflo ns hrat ar"e re ated to' bearer modlflcation'I: ~ . .. . • .. ' , . . •.. • ,': , ,- ., . - I1 ' " '- . - ~ , . • ' . '- '-~, - .· • · ~I '1-- " . , I I ". '. · ·· · ..11 - 1 .• ·

. ., : . 1_ . , . .. """ I : ., . ,. , , J - , , . . . " ." , - . . _ - 1

Measur"ng the requested QCI (control pane) vs received QCI (user plane)the r·e·fo····re·eq u ires 'e' n rlchin ' g , ,_ '1th'e'" requests d Q· ·r · - · ·C:.- · · · 111 ·n · t o · ·'the" u 'se"r IP 'Jane r ecord s s o1 '-- ._ , '., .••. 1- I~ ' :" 1 1 1 I ',- -_ _ , 1 I " " ... , : 1 ' ~ '~ : I I ,: ." , ,I~ I '- . : ' I'" I: . . . . " . ,~ .[,,,- ••. .. . " .. ..r- '.I~': . .,.••., , ," .

that c o m p a r i s o n m ·· ie · · , a · · · · · · ·S: · · · · u.r : · !e · · . · · · ·m· .· · · · ee n t Ic ·· · . · · ·a :· · ·· : , · · ·b· . · · · . · e. _ . _ _ . · · ·m:" ; "a- · · · , : ·d. · · · · · ·8· · · · · · · · · ,I .. " .. , " ... . ' '.. " " ... . , . . '" ,." . . I ' . .' . . - .". , .. ' . ".... ." . "." ... . .' I , '.. , .,," '," •

QC~=B (non , -GBR) 300 m s , 0 •6 V~,deo (Bu~f:eredStreamlnq)

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QCII=9 (non'-G.BIR) 300 m s '1'O~6 'TCIP-,b,ased ( I e , . g " l lWWW, e-mail, chat, H pj etc.)


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Testing and Optimizing LTE