LTE PRACH Optimization(ENodeB Cluster 2) Final Report 05052015

7/17/2019 LTE PRACH Optimization(ENodeB Cluster 2) Final Report 05052015

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TE PRACH Optimization (eNodeB Clu

Preliminary Report 05/05/2015



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HUAWEI TECHNOLOGIES CO., LTD.

Contents

Page 2

1 Overview

2 Tria Cu!"er

3 #PI!

5

Co$cu!io$



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Duri$g ra$%om acce!!, "he eNo%e& !e$% ra$co$'gura"io$ "o a UE. The UE !e$%! "he ra$%

(ream)e "o "he eNo%e& "o i$i"ia"e a ra$%om The ra$%om acce!! (ream)e i! a )ur!", whiccic (re'- CP/, a (ream)e !e*ue$ce, a$%"he "ime %omai$ a$% !i- re!ource )oc0! i$ "%omai$.

Pream)e !e*ue$ce! are ge$era"e% +rom cc1a%o3Chu 1C/ !e*ue$ce!. The ogica i$%e!e*ue$ce ra$ge! +rom 4 "o 567.

Each ce ca$ )e co$'gure% wi"h 89 (ream)89 (ream)e !e*ue$ce! ca$$o" )e ge$era"e1C !e*ue$ce, "he are o)"ai$e% +rom !u)!e*!e*ue$ce!.

The ogica i$%e- o+ a 1C !e*ue$ce a$% "he !hi+" are i$%ica"e% ) "he (rach3Co$'g$%e- $um)er o+ ccic !hi+"! i! %e"ermi$e% ) "he o$ "he ce "(e a$% ce ra%iu!.

Co$"e$"io$3)a!e% ra$%om acce!!(roce%ure

LTE Random Access Procedure (Contention-ased)

How i" wor0!




Root !e"uence Plannin#(Lo$ !peed Cell)Pream)e !e*ue$ce! are ge$era"e% +rom ccic !hi+"! o+ 1a%o3Chu 1C/ !e*ue$ce!. The a 1C !e*ue$ce +orma" 436/ra$ge! +rom 4 "o 567. Nc! i$%ica"e "he ccic !hi+"!.

configuration value configuration value

0 0 8 46

113

959

2 15 10 76

3 18 11 93

4 22 12 119

5 26 13 167

6 32 14 279

7 38 15 419

How i" wor0!


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%n&luence Anal'sis o& Root !e"uence con&lict:or e-am(e, i+ roo" !e*ue$ce o+ ce A a$% ce & i! i0e )eow, a$% ce a! a$% have "he overa((i$g coverage area, "he$ co$;ic" e-i!"!<

Root Sequence Index

Cell A 0 1 2 3 4 5 6

Cell b 4 5 6 7 8 9 10

Due "o =oo" Se*ue$ce co$;ic" )e"wee$ Ce A a$% Ce &, i+ UE !e$% (ream)e "o Ce A "he$ Ce & a%e"ec"e% "he (ream)e a$% !e$% =A= me!!age.UE wi acce!! "o ce A, "he =A= o+ ce & i! $o" u!e+u, !o i" i! "he wa!"e o+ !!"em re!ource

How i" wor0!


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Actiit' *escription

Page 8

Wi"h "he roo" !e*ue$ce reu!e chec0, 272 ce! roo" !e*ue$ce co$'gura"io$ i! !ugge!"e% +or Cu!"er 2<

eNo%e& Cu!"er ce i!"

?OP E-ecu"io$

Week Date ! "#$ "#$

1828-April00:00H

eNodeB Cluster 2LTE PRACH

pti!i"#tio$H%

LTE P=ACH

I?I1ATION 272




+P% ,onitorin#

Page 7

Ta)e )eow !how "he com(ari!o$ o+ ge$era #PI )e"wee$ "he 6r% wee0 7 %a!, 9@2B9@?OP a$% a+"er "he ?OP7 %a!, 9@25B@49//. I" "a0e "he average re!u" o+ 7 %a! i$ wei", we ca$ '$% a #PI 0ee( $orma "re$%

MOP Type Units KPI Name Before After

LTE

Accesibility %

RRC Setup Success Rate 99%967 99%968

PRACH OptimizationE-RAB Setup Success

Rate 99%960 99%953

(eNoeB Cluste! "# Retainability % Call $!op Rate 99%992 99%994

"ob&l&t' %nt!a-&!e'uency Hanoe!

Out Success Rate 0%014 0%009

CS)B %success !ate o& success&ul

en to en ata CS)B 99%940 99%938

T!a&&ic *bps

ae!a+e o,nlint.!ou+.put pe! cell

2503%857 2516%714

/B $L T!a&&ic 0olume 1 6%227 16%136

(oad *a1 Actie 2se! 2060%344 2057%272



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==C SS= 0ee( $orma "re$% which i! grea"er "ha$ .F a "he "ime

+P% ,onitorin#-RRC !!R



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E=A& SS= 0ee( $orma "re$%

#PI ?o$i"ori$g3E=A& SS=




Ca Dro( =a"e 0ee( !"a)e com(are% wi"h )e+ore, $o i$crea!e a+"er "he ?OP

#PI ?o$i"ori$g3Ca Dro( =a"e




I$"ra3:re* HO S= 0ee( !"a)e

#PI ?o$i"ori$g3 I$"ra3:re* HO S=




C:S& Succe!! =a"e i! i$ reguar "re$%

#PI ?o$i"ori$g3CS:& S=




To"a "rac average u!er $um)er %i%$" cha$ge much a+"er "he ?OP

#PI ?o$i"ori$g3Trac U!er




DL "rac a$% average DL "hrough(u" have $o )ig %iere$ce

#PI ?o$i"ori$g3DL Trac J Through(u




A+"er "he ?OP e-ecu"e% o$ 9@25, we ca$ '$% "ha" L.=A.Gr(&.A"" "ime! %ecrea!e% a)!ou A! "he roo" !e*ue$ce overa((i$g o+ o("imi>e% ce! mai$ ha((e$e% i$ "he Grou( &! Whe$ "he co$;ic"io$ re!ove%, "he wro$g %e"ec" o+ ra$%om acce!! %ecrea!e%, "he$L.=A.Gr(&.A"" "ime! re%uce%.

#PI ?o$i"ori$g3=a$%om Acce!! A""em(




Conclusion

Page 8

There i! $o $ega"ive im(ac" +rom LTE P=ACH O("imi>a"io$ ?OP. A #PI $orma "re$%

A+"er "he ?OP e-ecu"e%, "he wro$g %e"ec" o+ ra$%om acce!! "ime! %ec

a)!ou"e which mea$! e!! ra$%om acce!! re!(o$!e "ime!, re!u"i$g wa!"e o+ !!"em re!ource.

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LTE PRACH Optimization(ENodeB Cluster 2) Final Report 05052015