Security Level:
Preliminary Report 4/27/2015 www.huawei.com
HUAWEI TECHNOLOGIES CO., LTD.
How i wor-s LTE
Random Access Procedure (Contention-ased)
Conenion0$ased random access #rocedure
During random access, he eNode! send random access con"guraion o a UE. The UE sends he random access #ream$%e o he eNode! o iniiae a random access re&ues. The random access #ream$%e is a $urs, which consiss o' a c(c%ic #re") *C+, a #ream$%e se&uence, and an e)ra #ar in he ime domain and si) resource $%oc-s in he 're&uenc( domain.
+ream$%e se&uences are generaed 'rom c(c%ic shi's o' ado/0Chu *C se&uences. The %ogica% inde) o' a C se&uence ranges 'rom 1 o 234.
Each ce%% can $e con"gured wih 56 #ream$%e se&uences. I' 56 #ream$%e se&uences canno $e generaed 'rom a sing%e C se&uence, he( are o$ained 'rom su$se&uen C se&uences.
The
%ogica% inde) o' a C se&uence and he 7a%ue o' a c(c%ic shi' are indicaed $( he #rach0Con"gnde) "e%d in SI!8. The num$er o' c(c%ic shi's is deermined $( he e Node! $ased
How i wor-s Root
!e"uence Plannin#(Lo$ !peed Cell)
+ream$%e se&uences are generaed 'rom c(c%ic shi's o' ado/0Chu *C se&uences. The %ogica% inde) o' a C se&uence* 'orma 103ranges 'rom 1 o 234. Ncs indicae he c(c%ic shi's.
configuration 0
value
configuration
value 46
0
8
1
13
9
59
2
15
10
76
3
18
11
93
4
22
12
119
5
26
13
167
6
32
14
279
38
15
419
7
How i wor-s %n&luence
Anal'sis o& Root !e"uence con&lict
9or e)am#%e, i' roo se&uence o' ce%% A and ce%% ! is %i-e $e%ow, and ce%% as and ce%% ! ha7e he o7er%a##ing co7erage area, hen con:ic e)iss; Cell A
0
1
2
Cell b
4
5
6
Root Sequence Index 3 4 7
8
5
6
7
9
10
11
Due o
Actiit' *escription Wih he roose&uence reuse chec-, 34> ce%%s roose&uence con"guraion is suggesed o $e o#imi?ed;
eNode! C%user ce%% %is
LTE +
@O+ E)ecuion Week
17
Date
23-April 00:00H
!
"#$
"#$ !x
eNodeB Cluster 1
LTE PACH !pti"i#$tio%
H&
+P% ,onitorin# Ta$%e $e%ow show he com#arison o' genera% +I $eween he second wee- *6 da(s, 6B56B> $e'ore he @O+ and a'er he @O+*6 da(s, 6B836B85* +I daa on +. I a-e he a7erage resu% o' 6 da(s in wee-.
LTE PRACH Optimization (eNodeB Cluster 1)
Type
Units
Accesibilit
!
Retainabilit
!
"ob'l't(
!
C"B
!
KPI Name
Before
After
Difference
RRC "etup "uccess Rate
99%972
99%966
&0%006
E#RAB "etup "uccess Rate
99%973
99%970
&0%004
Call $rop Rate
0%010
0%043
0%033
99%991
99%988
&0%003
99%943
99%945
0%003
17%032
0%452)
%ntra#&re'uenc Handoer Out "uccess Rate success rate o& success&ul end to end data C"B
*bps
aera+e do,nlin- t.rou+.put per cell
16%955
/B
$L Tra&&ic 0olume
3368%886
Tra&&ic
*oad
*a Actie 2ser
3830%55 13%704) 1 4199%50 4093%500 2%589) 0
+P% ,onitorin#-RRC !!R C SS '() 3811111 311111 3111111 8>11111 8211111 8411111 8511111 8=11111 8611111
L<
L<
<
<>.> a%% he imeF
+I @onioring0E11111 8211111 8411111 8511111 8=11111
L.E0
E
L.E0
+I @onioring0Ca%% Dro#
=111 6=11 6111 3=11 3111 8=11 8111 =11 111 =11 1
L.E0
Ca%% Dro#
Ca%% Dro#
+I @onioring0 Inra09re& HO S< +%tr$-,re H! S '() 511111 611111 811111 111111 211111 511111 611111 811111 1
L.HHO.Inra9re&.E)ecAOu Inra 9re&uenc( HO Success
Inra09re& HO S< -ee# sa$%eF
L.HHO.Inra9re&.E)ecSuccOu
+I @onioring0CS9! S< CS,B S '() 21111 51111 61111 81111 11111 21111 51111 61111 81111 1
L.CS9!.+re#A CS9! +re#are Success
C9S! Success
L.CS9!.+re#Succ
+I @onioring0Trac User Tr$.c /ser 6511
>81 >11 221 251 261 281 211 421 451 461
6611 6811 6111 3211 3511 3611
@a) Aci7e User
L.Trac.User.A7g
Toa% rac a7erage user num$er didn change much a'er he @O+F
+I @onioring0DL Trac Through#u Av Cell *L Tp 'it4s) 6=11 6111 3=11 3111 8=11 8111 =11 111 =11 1
2.= 2 4.= 4 5.= 5 =.= = 6.=
DL Trac Jo%ume*G$is
Ce%% DL ThKH*@!Bs
DL rac and a7erage DL hrough#u ha7e no $ig di/erenceF
+I @onioring0
L.
L.
L.
A'er he @O+ e)ecued on 6B83, we can "nd ha L.
Conclusion There
is no negai7e im#ac 'rom LTE +
