Optimization
zation Analyze
LTE Optimi
Internal Only▲
TABLE OF CONTENT

Part 1 Basic Cell Parameter Planning

Part 2 LTE
LTE Call
C all Drop Optimization
Optimiza tion

Part 3 LTE
LTE Cell
C ell Reselection Optimizat
Optimization
ion

Part 4 LTE
LTE Coverage
C overage Optimiza
Optimization
tion

Part 5 LTE
LTE Hanover
Ha nover Optimizat
Optimization
ion
Access Problem due to PRACH not
Planned
(1)
Symptom:
In
a site test,
under
cellor
can
make
a calltoinaccess
the areas
opposite in
tothe
the
antenna,
ut itthe
is UE
di!!icult
to one
access
e"en
unale
the eNodeB
areas that other cells can also co"er# The $%$& and CIN$ meet the access
re'uirements#
Analysis:
(# A!ter the othe
otherr t)o cells o! the eNodeB are disa
disaled,
led, the UE can access the
eNodeB i! the si*nals meet the access re'uirements#
+# A!ter all three cells ar
are
e enaled, access is di!!icult or unale
unale in the o"erlapped
co"era*e areas o! the three cells# The UE sends the $$C Connection $e'uest
messa*e, ut the system does not respond#
# %i*nalin* on the eNod
eNodeB
eB side sho)s the
the system recei"es
recei"es the mess
messa*e
a*e and
responds, ut the response is not recei"ed y the UE#
-# Check
results
o! the start
acc
access
ess
parameter
con!i*uration
con!i*uration
sho)preamle/
the par
parameter
ameter
.Lo*ical
root
se'uence
numer
used to
*enerate prach
o! the three
cells is set to 0, and the parameter .NC
.NC%
% used to *enerate prach preamle/
preamle/ is set
to ((# This means the access preamles o! the three cells sent to the UE are the
same# 1hen the UE is in the o"erlapped co"era*e are
area,
a, the three cells recei"e the
messa*e !rom the UE and returns
returns the 2%3- mess
messa*e
a*e at the same time# The UE
recei"e t)o 2%3- messa*es and cannot demodulate them, so the access attempt
!ails#
Access Problem due to PRACH not
Planned (2)
Solution:
$eset the &$AC4 parameters, includin* .Lo*ical root se'uence start
numer used to *enerate prach preamle/, and .NC% used to
t o *enerate
prach preamle/# A!ter
A!ter the resettin*, the UE can access
acc ess the system in
any co"era*e area o! the eNodeB so lon* as the si*nals are o! *ood
'uality#
Summary:
&rior
to the kicko!!
o! a to
pro5ect,
it isnei*hor
re'uired cells#
to plan access6related
parameters
in addition
&CI and
UE Unable to Access due to Incorrect
Parameter Confguration (1)
Symptom7
Symptom7
In the pre6preliminary acceptance test o! &3&, it is !ound under the cell
)hose &CI is 80, UEs cannot access the %29 eNodeB and se"eral access
!ailures take place in one minute# 4o)e"er, the radi
radio
o si*nal 'uality is !ound
! ound
*ood :$%$& ; 6(0- dBm, CIN$ ; (0+ dB<#
UE Unable to Access due to Incorrect
Parameter Confguration (2)
Analysis7
Analysis7
The UE should report the %tatus packet to the eNodeB a!ter it recei"es the LTE
=L A2 All &=U messa*e#
4o)e"er, the analysis o! UE lo*s sho)s the eNodeB does not recei"e the
%tatus packet# As a result, the eNodeB repeats sendin* the messa*e in the $LC
layer#
On the UE side, the UE has recei"ed the messa*e - times, )hile on the eNodeB
side, the $NLU sends the $nlu$nlcErrInd messa*e to the $NLC, and the $NLC
returns the $rcConnection$elease
$rcConnection$elease messa*e, causin* the UE>s !ailure to access#
By de!ault, our net)ork parameter settin* allo)s %$B si*nalin* to e repeatedly
transmitted !or up to (? times#
Check the parameter settin* and !ind the ma@imum $LC A2 retransmission
time )as incorrectly set to -#
2ean)hile, the %$B $LC Type o! the eNodeB is also incorrectly con!i*ured as
U2 :Unackno)led*ed 2ode<, )hich should e A2 :Ackno)led*ed 2ode<#
Solution:
2odi!y the %$B $LC Type to e A2 and the prolem is sol"ed#
Access Failure due to a UE Fault (1)
Symptom7
Symptom7
In the pre6preliminary acceptance test o! &3&
&3&,, it is !ound %amsun* UEs
!ail to )ork !rom time to time, leadin* to access !ailure#
Access Failure due to a UE Fault (2)
Analysis:
First, the UE lo*s are analyed# The radio en"ironment is *ood as the
$%$& is 6+ dBm and the CIN$ is ( dB# But a!ter the U
UE
E recei"es the
.Acti"ate de!ault E&% earer conte@t re'uest/ messa*e !rom the 22E,
it re5ects the re'uest throu*h the .ulIn!ormationTrans!er/ messa*e on
the
uplink, the
andcomparison
returns the o!
reason
.&TI unmatched/#
4o)e"er,
4o)e"er
the si*nalin*
elements in the normal
procedure )ith those in the anormal procedure sho)s the &TI
:&rocedure transaction identity< sent y the 22E is the same as the
t he
&TI carried in the attach re'uest messa*e o! the UE#
U E#
There!ore, it is concluded that the prolem is caused y %amsun* UE>s
!ailin* to maintain the &TI
&T I properly#
properly#
Solution:
Update the 41D%1 "ersion o! %amsun* UE or replace %amsun* UE
)ith other UEs, !or e@ample, ualcomm UEs do not report such a
prolem#
Internal Only▲
TABLE OF CONTENT

Part ! "asic Cell Parameter Planning

Part 2 LTE Call Drop Optimization


Part 3 LTE
LTE Cell
C ell Reselection Optimizat
Optimization
ion
Part 4 L
LTE
TE Coverage
C overage Optimiza
Optimization
tion

Part 5 LTE
LTE Hanover
Ha nover Optimizat
Optimization
ion
Call Establishment and Call ro!

NA% and A%

NA%7 Non6Access %tratum

A%7 Access
Access %tratum
Call Establishment and Call ro!

Connection $elease
UE
EUTRAN
RRCConnectionRelease
RRCConnectionRe
lease

Call =rop  =e!inition

A call
call )ill e dropped )hen
)hen an UE e@its the $$CGCONNECTE=
state#
Call Establishment and Call ro!

Call
=rop  Common Causes

(# Connection $eestalishment $e5ect :%i*nalin*<

:(<# The UE sends the rrcConnectionReestablis
rrcConnectionReestablishmentRequest;
hmentRequest; Cause =
otherFailure messa*e throu*h the UL6CCC4#

:+<# The eNodeB returns the rrcConnectionReestablishmentReject messa*e
throu*h the =L6CCC4#

:<# 1hen e@periencin* a call drop prolem, the UE starts to recei"e the
roadcast messa*e that contains %IB( throu*h the BCC46%C4
BCC46%C4 until the UE
ori*inates the ne@t call#
Call Establishment and Call ro!

Call =rop  Common Causes

+# &oor %i*nal o"er the Air Inter!ace :%i*nalin*<

Incomplete si*nalin*7 1ithout recei"in* the Connection Release messa*e,
the UE is transitioned !rom the RRC-CONNECE! state to the RRC-"!#E
state#

A typical symptom
symptom o! this call drop prolem7 The UE sends the
RRCConnectionReestablishmentRequest messa*e ut does not recei"ed
the RRCConnectionReestablishment messa*e, and e"en the UE does not
send the RRCConnectionReestablishmentComplete messa*e#
Call Establishment and Call ro!

Call =rop  Common Causes

# Other Causes

Narro)ly speakin*, a call drop prolem occurs only )hen the UE
sends the rrcConnectionReestablishmentRequest messa*e, that is
to say, the $$C connection is roken#

I! the $$C connection is reestalished due to a hando"er or any other
prolem, the $$C
$$C reestalishment is usually success!ul#
success!ul# In a real
pro5ect, you need to pay special attention to such prolem# 1hene"er
necessary, you must reach an a*reement )ith the customer on
)hether re*ardin*
re*ardin* such a prolem as a call drop prolem#
Cause Anal"sis 1 # Poor Co$erage

&rolem %ymptoms
Cause Anal"sis 1 # Poor Co$erage

Cause Analysis7 Analyin*
Analyin* the =ri"e
=r i"e Te
Test =ata
=at a

%tep (# Collect the dri"e test data#

%tep +# Analye the dri"e test data usin* H&O% CNA or

TE2% =isco"ery#
%tep # Check )hether there is any o! the !ollo)in*
symptoms throu*h the *eo*raphical chart or Tale 9ie)
)hen a call drop prolem occurs7



Lo) $%$& :ser"in* cell<7 $%$& J 6(08dBm
Lo) CIN$ :ser"in* cell<7 CIN$ J 0dB
&oor si*nal stren*th :nei*horin* cell<7 %i*nal stren*th
K 6(08dBm
Cause Anal"sis 1 # Poor Co$erage

Optimiation %olutions

(# =etermine )hich sectors are ser"in* current poor
co"era*e areas#

+# =etermine the most suitale sectors ased on the
net)ork topolo*y and radio en"ironment, and stren*then
the co"era*e o! this area#

Trouleshoot the hard)are !aults !rom the aseand, $F, and antenna
system, 9%1$ alarms#

Increase the $% po)er o! the ser"in* cell#


Increase the po)er o! the ser"in* sector#
Ad5ust the antenna
antenna tilt o! the ser"in* sector#
sector#

Ad5ust the antenna
antenna aimuth o! the ser
ser"in*
"in* sector
sector##

Add some sites plus
plus ad5ustin* the anten
antenna
na tilt and aimuth o! th
the
e
surroundin* ase stations#

#
Implement
Co"era*e  Capacity Optimiation :%ON6
CCO<
!unctionthe
:pendin*<#
Case %tud" 1 # Poor Co$erage

&oor Co"era*e
$%$& J 6(+0 dBm
%er"in* Cell CIN$ J 6+ dB
Cause Anal"sis 2 # Hando$er Failure

&rolem %ymptoms

Be!ore a call drop prolem occurs, the UE has e"er sent the
t he
measurement report and recei"ed the
RRCConnectionRecon$i%uration messa*e !rom the eNodeB#

The UE sends the rrcConnectionReestablishmentRequest;
Cause = han&o'erFailure messa*e immediately )hen recei"in*
the roadcast messa*e !rom the tar*et cell#

The UE usually sends the
rrcConnectionReestablishmentRequest messa*e to the source
cell a!ter e@periencin* a hando"er !ailure#
Cause Anal"sis 2 # Hando$er Failure

Cause Analysis7 Analyin* the %i*nalin* =ata

Otain the si*nalin* data collected !rom the dri"e test#

Check )hether there is any o! the !ollo)in* symptoms )hen a call drop
prolem occurs7

Be!ore a call drop prolem occurs, the UE has e"er sent the
measurementReport messa*e#

The UE can recei"e the rrcConnectionRecon$i%uration messa*e that
contains the (obilityControl"n$o !ield !rom the eNodeB#

1hen hando"er to the tar*et cell that is carried y the
rrcConnectionRecon$i%uration messa*e, the UE can recei"e the
system"n$ormation)loc*ype+ messa*e throu*h the BCC46%C4#

1hen recei"in* the system"n$ormation)loc*ype+ messa*e, the UE sends
the rrcConnectionReestablishmentRequest Cause=han&o'erFailure
messa*e#

Usually,
UEto
can
hando"erthe
ack
thesuccess!ully
source cell# reestalish the connection )ithin +00 ms, and
Cause Anal"sis 2 # Hando$er Failure

Optimiation %olutions

Check )hether the nei*horin* cells are properly con!i*ured y comparin* the
Nei*hor Cell )orksheet o! the source cell to the %er"in* Cell )orksheet o! the
tar*et cell#

Check )hether the tar*et cell is normally runnin*#



No it errors durin* the transmission
Normal po)er output
No hando"er !ailure due to the cell o"erload

Check )hether the so!t)are "ersions o! oth source and tar*et cells are correct#

Familiarie yoursel! )ith common hando"er !ailures#


A hando"er
hando"er !ailure occurs ecause the + inter!ace is improperly con!i*ured#
A hando"er
hando"er !ailure occurs ecause tra!!ic load is urdened in a sin*le cell#

A hando"er
hando"er !ailure occurs ecause the hando"er success rate is too
t oo lo) in this cell#

A hando"er
hando"er !ailure occurs ecause a ne) site is deployed in the surroundin* area#

A hando"er
hando"er !ailure occurs ecause the UE is located at the ed*es o! di!!erent 22Es#

A
hando"!re'uencies#
hando"er
er !ailure occurs ecause the UE is located at the orders o! ase stations in
di!!erent
Case %tud" 2 # Hando$er Failure

Inter6Fre'uency 4ando"er Unsupported
Cause Anal"sis & # 'issing eighbor

&rolem %ymptoms
Cause Anal"sis & # 'issing eighbor
：

Cause
Analyin*
%i*nalin*
=ata
OtainAnalysis
the si*nalin* data
collected !romthe
the dri"e
test#


Check )hether there is any o! the !ollo)in* symptoms )hen a call drop prolem
occurs7

Be!ore a call drop prolem occurs, the $%$& o! the ser"in* cell is continually
c ontinually
decreased#

Be!ore a call drop prolem occurs, the UE sends the measurementReport
messa*e consecuti"ely# The purpose is to check )hether the si*nals o!
nei*horin* cells are stron* enou*h# The si*nal o! the ser"in*
ser" in* cell ecomes
poorer and poorer ecause no nei*horin* cell is con!i*ured,
c on!i*ured, and e"entually this
causes a call drop prolem#

The measurementReport messa*e sent y the UE contains the tar*et

nei*horin* cells that satis!y the A or A8
A8 e"ent, dependin* o
on
n system setup#
The system :nei*horin* cell< messa*e sent y the ser"in* cell does not contain
the tar*et nei*horin* cell o! the measurementReport messa*e sent y the UE#

A!ter sendin* the measurementReport messa*e, the UE does not recei"e the
rrcConnectionRecon$i%urationRequest messa*e )ith a hando"er instruction
!rom the eNodeB#
Cause Anal"sis & # 'issing eighbor

Optimiation %olutions

Usin* the con!i*uration tool or atch6import !unction in
the O2C, add the missin* nei*hor cells to the
ser"in* cell list prior to the call drop#

Implement the AN$
AN$ !unction to optimie the
con!i*uration o! nei*horin* cells# :pendin*<
Case %tud" & # 'issing neighboring Cell

The UE sends the measurementReport messa*e !or se"eral
times e!ore a call drop prolem occurs#
Cause Anal"sis  * +$ershooting

&rolem %ymptoms
Cause Anal"sis  * +$ershooting

Cause Analysis7 Analyin* the %i*nalin* =ata

Otain the si*nalin* data collected !rom the dri"e test#

Check )hether there is any o! the !ollo)in* symptoms )hen a call
drop prolem occurs7

The si*nals in a co"era*e area )here a call drop prolem
occurs, ser"in* cell, or searchale nei*horin* cell contains
some o"ershootin* si*nals :o"ershootin*  or more layers<#

=etermine )hether the co"era*e area )here a call drop
prolem occurs is in nature a pilot polluted area, )hich is
ser"ed y more than
th an three cells :$%$& K 6((0
6((0 dBm, CIN$ J 0
dB<#

=etermine )hether any nei*horin* cell is uncon!i*ured# Check
)hether the nei*horin* cell list o! the co"era*e area contains
any o"ershootin* cell#
Cause Anal"sis  * +$ershooting

Optimiation %olutions

The *eneral principle is7 on the condition that the co"era*e area
is pro"ided )ith stale and proper si*nals, try as est as
possile to control the si*nals o! the o"ershootin* area#





=ecreasin* the po)er o! the o"ershootin* area
Increasin* the antenna do)ntilt o! the o"ershootin* area
By takin* the order co"era*e o! the o"ershootin* area as )ell as the
net)ork topolo*y into consideration, care!ully ad5ust the antenna aimuth o!
the o"ershootin* area#
&ilot &ollution Caused y O"ershootin* Co"era*e

Increase the po)er o! the primary sector

Ad5ust the antenna do)ntilt
do)ntilt o! the primary
primary sector

Ad5ust the antenna aimuth
aimuth o! the primary
primary sector

Control the polluted si*nals !rom other areas
Nei*hor Cell Uncon!i*ured7 Optimiin* nei*hor cells
Cause Anal"sis , # E-ui!ment Fault

&rolem %ymptoms

E'uipment Faults

4ando"er anormalities

A call drop prolem occurs and can reoccur )hen a
ser"ice is processed at a !i@ed time or place#

A call drop prolem occurs and can reoccur in one or
more speci!ic sectors o! the eNodeB#

A call drop prolem occurs and can reoccur in an inter6
22E, inter6TA, or any other special area#
Cause Anal"sis , # E-ui!ment Fault

Cause Analysis7 Analyin* the =ri"e Te
Test =ata and
O2C %tatistics =ata

%tep (# Collect the re'uired data#

%tep +# Analye
Analye the data e!ore
 e!ore and a!ter the call drop prolem
occurs#
 $adio en"ironment :3E<7 poor co"era*e, !ast !adin*,
shado)in*
 Co"era*e o! the ser"in* cell :$%$& and %IN$<
 Nei*horin* cell con!i*uration and hando"er statistics
 %i*nalin* !lo) anormalities

%tep # Eliminate the causes one y one and sum up some help!ul
principles
 1hole or part o! a siteM
 %( or + inter!aceM
 A!!ected y any critical operationsM
operatio nsM
Cause Anal"sis , # E-ui!ment Fault

Optimiation %olution

I! a call drop prolem is caused y any e'uipment !ault, you
need to sumit it to an $= en*ineer#
en*ineer#

1hen necessary, you
you must capture the re'uired
in!ormation !or !urther analyin* the call drop prolem, in
coordination )ith the $= en*ineer#

Follo) up the prolem trouleshootin* procedure#

E"entually,, "eri!y that the prolem is properly eliminated#
E"entually
Cause Anal"sis . # Inter/erence

&rolem %ymptoms :Uplink Inter!erence<
Cause Anal"sis . # Inter/erence

&rolem %ymptoms :=o)nlink Inter!erence<
Cause Anal"sis . # Inter/erence

Cause Analysis ： !ri'e est !ata Analysis , O(C !ynamic !ata
Analysis

%tep (# Collect the dri"e test data and dynamically oser"e the $%%I
data in the O2C )hen a call drop prolem occurs#

%tep +# Analye the data !eatures )hen a call drop prolem occurs7

Check )hether the $%%I o! the BT% is too hi*h :such as 68 dBm or
hi*her<# I! yes, you can in!er that uplink inter!erence is present#

Check )hether the transmit po)er o! the UE is *reater than +0 dBm
)ithin a !e) minutes prior to the call drop
dr op occurrence# At this time, the
UE
not located
in anyis)eakly
co"ered area# In this case, you can in!er
thatisuplink
inter!erence
present#

Check )hether the $%$& is 60 dBm or etter ut the CIN$ is smaller
than 0 dB in the ser"in* cell :e"en includin* nei*hor cells< that is ein*
tested# I! yes, you can in!er that do)nlink inter!erence is present#

%tep
# it=etermine
)hich type o! inter!erence is present, and then
handle
accordin*ly#
Cause Anal"sis . # Inter/erence

Optimiation %olution


=etermine and trouleshoot uplink inter!erence7

%peci!y the rou*h ran*e o! the inter!erence :)hich cells e@periencin*
inter!erence and )hether these cells are included in a certain cluster<

Usin* a spectrum scanner such as BT+80 plus a*i antenna to
pinpoint the inter!erence source#
=etermine and trouleshoot do)nlink inter!erence7

Con!irm that do)nlink inter!erence does not come !rom any internal
system :This re'uires eliminatin* the o"ershootin* co"era*e and
uncon!i*ured nei*hor cell prolems<#

I! do)nlink inter!erence comes !rom an e@ternal system, you need to
use a spectrum scanner such as BT+80 plus a*i antenna to
pinpoint the inter!erence source#
Cause Anal"sis 0 # rac Congestion

&rolem %ymptoms

There are relati"ely too many real6time acti"ated suscriers
in the cell#

The
cell starts to re5ect the UEs durin* the admission control
procedure#

The transmit po)er o! the cell is ecomin* almost saturated#

The call setup success rate and the call drop rate are
ecomin* )orse#
Cause Anal"sis 0 # rac Congestion

Cause Analysis: O(C er$ormance Statistics
Analysis

%tep (# Collect per!ormance statistics in usy hours !rom the
O2C, includin* call setup, hando"er, and call release#

%tep +# uery the numer o! suscriers as )ell as the tra!!ic
load )hen a call drop prolem occurs, and then check
)hether the cell is hea"ily loaded#

%tep # uery the cell setup success rate, hando"er success
rate, and call drop rate and locate their potential causes#

%tep -# 1hen
1hen a cell starts to re5ect the UEs
UEs durin* the
admission control procedure ecause o! resource
insu!!iciency, you can in!er that the call drop prolem is
caused y tra!!ic con*estion#
Cause Anal"sis 0 # rac Congestion

Optimiation %olutions

Increase the system capacity
capacity##





Increase the cell po)er#
Compress the o"erhead channel po)er#
Increase the resource locks :$Bs<#
Add some ase stations#
stations#
Chan*e the net)ork topolo*y and alance the tra!!ic
load#

%hrink the co"era*e and ad5ust the $F !or miti*atin* the
po)er o"erload

Implement the %ON6CCO !unction :pendin*<#
Internal Only▲
TABLE OF CONTENT

Part ! "asic Cell Parameter Planning

Part 2 LTE
LTE Call
C all Drop Optimization
Optimiza tion


Part 3 LTE Cell Reselection Optimization
Part 4 LTE
LTE Coverage
C overage Optimiza
Optimization
tion

Part 5 LTE
LTE Hanover
Ha nover Optimizat
Optimization
ion
The %6criterion !or Cell %election :%r@le" K 0<
0<
%r@le" ; r@le"meas  :r@le"min P
r@le"mino!!set<
r@le"mino!!se
t< 6 &compensation

r@le"meas is the re!erence si*nal recei"ed po)er :$%$&< o! the
candidate cell#

r@le"min and r@le"mino!!set
r@le"mino!!set are the minimum recei"ed le"els !or
cell campin* con!i*ured in the %IB :%IB(<# The r@le"mino!!set
r@le"mino!!set is used
only in the situation )hen the UE camps on a 9&L2N cell#

&compensation uses a lar*er "alue amon* 0 and the "alue o! &E2A
:the peak uplink transmit po)er o! the UE< deductin* &U2A :the
ma@imum $F output po)er o! the UE<, that is 2A （ &E2A －
&U2A, 0<# The unit is dB#

Actually, it is the compensation o!
Actually,
o! UE>s transmit po)er and
and the ma@imum
allo)ed transmit po)er
po)er to the cell selection# :I! the transmit po)er o! UE is
lar*er than the ma@imum allo)ed transmit po)er, the &compensation is 0
other)ise it is necessary to use the transmit po)er o! UE to compensate
the access threshold#<
Cell $eselection &rocess

The process o! cell reselection includes these steps7 conductin*
measurement as per measurement rules, reselectin* a cell as
per cell reselection rules, and cell access "eri!ication#
A!ter
the UE has camped on a cell, it
)ill conduct measurement to determine
)hether there is a etter cell so as to
conduct cell reselection#
The
priority6ased cell reselection is a
ne) mechanism in the E6UT$AN#
Cell $eselection 2easurement $ules

To reduce po)er consumption, less measurement operations are
pre!erred# The 3&& %peci!ications de!ine t)o thresholds !or tri**erin*
the UE>s measurement# They are s6Intra%earch and s6NonIntra%earch,
)hich are all con!i*ured in %IB#

I! the 'uality o! the ser"in* cell is etter than the s6Intra%earch, the
UE can conduct no intra6!re'uency measurement#

I! the 'uality o! the ser"in* cell is etter than the s6NonIntra%earch
ut )orse than the s6Intra%earch, the UE )ill conduct the intra6
!re'uency measurement, ut not the inter6!re'uency or inter6$AT
inter6$AT
measurement#

I! the 'uality o! the ser"in* cell is )orse than the s6
NonIntra%earch, the UE )ill conduct the intra6!re'uency, inter6
!re'uenc y, and inter6$AT
!re'uency,
inter6$ AT measurements#
measure ments#

=urin* the early sta*e o! a commercial net)ork, the UEs are asically
data cards, and there is no need to consider the po)er consumption#
As a result, the con!i*uration
con!i*uration !or s6Intra%earch and s6NonIntra%earch
are not a"ailale# The UEs are re'uired to conduct the intra6!re'uency,
intra6!re'uency,
inter6!re'uenc
inter6!r
e'uency,
y, and inter6$AT
inter6$ AT measurements#
measure ments#
E"aluation and Cell %e'uencin* (

Accordin* to the priorities
priorities o! nei*hor cells and tthe
he ser"in* cell, the
cell reselection takes place in three situations :see ne@t pa*e<7
The cell )ith lo)er
priority !re'uency
%er"in*
Cell
The cell )ith hi*her
priority !re'uency
E"aluation and Cell %e'uencin* +

The priority o! the nei*hor cell is hi*her than that o! the ser"in* cell#


The si*nal 'uality :%non%er"in*Cell,@< o! the measured nei*hor is hi*her
than Thresh,4i*h in the time
t ime o! Treselection#
The priority o! the nei*hor cell is lo)er than that o! the ser"in* cell#

I! the ao"e t)o situations are not satis!ied, the cell is reselected )hen the
'uality o! the ser"in* cell is lo)er than Threshser"in*, lo),
lo), and the
measurement 'uality
'uality %non%er"in*Cel
%non%er"in*Cell,@
l,@ o! a nei*hor cell )ith lo)
lo)er
er
priority is hi*her than Thresh@, lo)#
E"aluation and Cell %e'uencin* +

The priority o! the nei*hor cell is e'ual to that o! the ser"in* cell#

All cells :includin* the ser"in* cell< are
are put in a 'ueue# I! a cell ranks
hi*hest in the 'ueue and lasts lon*er than the time set in Tre
Treselection,
selection, the
cell is selected# The $6criterion is sho)n elo)7
$s ; meas,s P 4yst
$n ; meas,n 6 o!!set

$s is the 'uality score o! ser"in* cell :rankin* criterion !or ser"in* cell<
and $n is the 'uality score o! the nei*hor cell#

meas,s and meas,n are the $%$& "alues o! the ser"in* cell and
and the

nei*hor cell respecti"ely#
G4yst is the parameter to control the hysteresis o! the ser"in* cell in the
t he
se'uence#

Go!!set de!ines the o!!set !or a nei*hor cell# For the intra6!re'uency
cells, it is the cell6ased
c ell6ased o!!set "alue# For the inter6!re'uen
inter6!re'uency
cy cells )ith the
same
priority,sed
priority,
it includes
t)o parts7 the cell6ased o!!set "alue and the
!re'uency6ased
!re'uency6a
o!!set "alue#
Accessiility
y 9e
9eri!ication !or
!or Cell $eselection
$eselection
Accessiilit

I! the est cell in the LTE
LTE !re'uency ran*e is arred or reser"ed,
it is re'uired that this cell is remo"ed !rom the cell reselection
candidate list on the UE#


The UE can try other cell o! the same !re'uency, unless the cell indicates
that the UE can not select any intra6!re'uency
intra6!re'uency cell in a period o! time#
I! the UE e"aluates the est tar*et cell and !inds that it is not
suitale due to some reasons#

For e@amples, the trackin* area prohiits roamin*, or the cell is not a cell
in the re*istered &L2N#

In a period o! time :)hich )ould not e lon*er than 00s< that !ollo)s, the
UE )ill not take any cell in this !re'uency as the tar*et cell !or
! or cell
reselection#
Cell $eselection %peed Factor (

By calculatin* the !re'uency o! cell reselections, the UE determines
)hich moility state it is in# In %IB, the moility state parameters are
con!i*ured, includin* n6CellChan*e2edium, n6CellChan*e4i*h, t6
4ystNormal and t6E"aluation#

In the period o! t6E"aluation, i! the count o! cell reselections is lar*er than n6
CellChan*e4i*h, the UE determines it is in a hi*h speed moility state#

I! the count o! cell
c ell reselections is lar*er than n6CellChan*e2edium,
n6CellChan*e2edium, the UE
determines it is in a medium speed moility state#

In the period o! t64ystNormal :t64ystNormal must e lar*er than t6
E"aluation<, the UE )ill return
return to the norma
normall moility state i! it doe
does
s not
detect any condition that meets the medium speed moility state or hi*h
speed moility state#
Cell $eselection %peed Factor +

In
hi*hto
speed
moility
state
medium and
speed
moility
state, the
UEthe
needs
otain
and uses
theand
s!62edium
s!64i*h
con!i*ured
in t6
$eselectionEUT$A6%F and '64yst%F !rom %IB# O! )hich, s!62edium
is the !actor used !or medium speed moility state, and s!64i*h is the
!actor used !or hi*h speed moility state#

2ultiply the correspondin* !actors o! Tre
Treselection
selection and t6$eselectionEUT$A6
%F,, and use it as the ne) timer !or cell reselection#
%F

Add the s!62edium or s!64i*h in '64yst%F
'64yst%F to hyst# The hyst is used in
the $6criterion#
Black D 1hite List, Access $estriction, Cell
 The UE should ypass the cells on the lack list )hen it conducts
%tates
cell selection, measurement and cell reselection#


Blacklisted cells are not considered in e"ent e"aluation or measurement
reportin*#
For the C%3 cells and 4yrid cells, the UE should otain the
C%3 I=s !rom the system in!ormation# I! the C%3 I= is stored on
the C%3 )hitelist o! the UE, the UE should put the cell in the
candidate list and conduct measurement and se'uencin*


Each UE elon*s to an access class :AC< in the ran*e 0 6 #

%ome UEs elon*s to one or more hi*h6priority ACs in the ran*e ((6(8,
)hich are reser"ed !or speci!ic uses# AC(0 is used !or emer*ency access#

The UE considers access to e arred i! access is arred !or all its
applicale ACs#
1hen the cellBarred state o! a cell in %IB( is arred, the UE can
not
select this cell in cell selection nor cell reselection, e"en in
emer*ency#
Late 2easurement

2easurement threshold7 s6Intra%earch and s6NonIntra%earch# =ue to
improper con!i*uration :too small "alue<, the cell reselection
measurement is started late# The conditions to start measurement are
ready,, ut no measurement is started#
ready


The
ser"in*
cell does not measurement<
pro"ide con!i*urations
!or s6Intra%earch
:a!!ectin*
intra6!re'uency
or s6NonIntra%earch
:a!!ectin* inter6!re'uency or inter6$AT measurement<# The UE
conducts the intra6!re'uency, inter6!re'uency and inter6$AT
measurements#
Increase the "alue o! s6Intra%earch or s6NonIntra%earch so that the
cell reselection measurement is started as soon as the 'uality o! the
ser"in* cell )orsens#
&in*6&on* $eselection

I! pin*6pon* cell reselections occur, you can increase the cell
reselection hysteresis, and raise the priority o! LTE
LTE cell reselection#

I! the ao"e method does not )ork, you can decrease the "alue o!
Threshser"in*, lo) !or the ser"in* cell#

For the same operator, the priority settin*s !or UT$AN and E6
UT$AN in the U2T% and LTE net)orks should e the same# The
cell reselection parameter con!i*urations on the t)o sides must
match each other so as to pre"ent the pin*6pon* hando"er#
Late Cell $eselection

I!
the on
cellan
reselection
conducted
too late,
t he UE
the
may !ailure
ori*inate
calls
unsuitaleiscell,
)hich easily
causes
access
or
call drops#

Take an intra6!re'uency cell reselection !or e@ample# To speed up
the cell reselection, the !ollo)in* methods can e used7

%et the "alue o! cell reselection Treselection
Treselection as small as possile#
At present, )e recommend settin* it to (s#

=ecrease the "alue o! 4yst#

=ecrease the "alue o! o!!set#
Call Con*estion

I! suscriers su!!er call con*estions in the o"erlapped co"era*e
area, you should decrease the threshold !or cell reselection to
other cells, no matter such call con*estions occur in )hich
net)ork, so as to properly distriute tra!!ic#
Case #t$y !
Improper measurement control threshold settin* leadin* to access
!ailure
Fault =escription
=urin* a commissionin* test, )e !ound that the UE !ailed to ori*inate
calls in a cell, ut it could ori*inate calls in a nei*hor cell )ith etter
'uality soon :hundreds o! milliseconds<#
Case %tudy (
Fault Analysis
Analysis
1e checked the UE lo* and !ound that the radio en"ironment o! the cell
that the UE accesses !or the !irst time )as poor :&CI;0Q, $%$&;6
(0dBm, CIN$;68dB<# There )as a nei*hor cell )ith *ood si*nal
'uality :&CI;Q, $%$&;6QdBm<, ut the UE did not select it# The
situation )as that the UE !ailed to access the cell )ith &CI;0Q, ut it
soon success!ully accessed the cell )ith &CI;Q# 1e checked the
%IB messa*es !rom the net)ork, and !ound s6Intra%earch;Q in the
intraFre'Cell$eselectionIn!o section# Accordin* the calculation !ormula,
! ormula,
the ser"in* cell ori*inate intra6!re'uency measurement )hen the $%$&
"alue is smaller than 6(0P(-;6((?
6(0P(-;6((?dBm#
dBm# Then, it is too late#
%olution
In current net)ork en"ironment, the terminals
are data cards, )hich ha"e no re'uirement on
po)er consumption# %o, )e can set the
parameter y%Intra%rch&re to !alse, ensurin*
that the terminal conducts $%$& measurement
!or intra6!re'uency nei*hor cells all the time#
Case %tudy +
Improper cell reselection parameter settin* leadin* to call drops
Fault =escription
=urin* a preliminary acceptance test !or &3&, the si*nal 'uality o! the
ser"in* cell )orsened *radually in the process o! UE
U E access, leadin* to
$$C call drop# The cell reselection parameters )ere improperly
con!i*ured, and the UE ori*inated calls on the cell )ith poor 'uality
si*nals, leadin* to $$C call drops#
Case %tudy +
Fault Analysis
Analysis
1e checked the UE lo* and !ound that the radio en"ironment o! the cell
that the UE accesses )as poor :$%$&;6+dBm, CIN$;(dB<# There
)as a nei*hor cell )ith *ood si*nal 'uality :&CI;+8( ， $%$&;6
Q#?dBm<, ut the UE did not select it# =urin* the access process, the
UE could not e handed o"er to a etter cell, the
t he si*nal 'uality o! the
ser"in* cell ecame )orse and )orse, and at last the call dropped#
1hen the time re'uirement :(s, the
t he minimum "alue< !or intra6!re'uency
cell reselection is met, the cell reselection process can e initiated
accordin* to the $6criterion# Furthermore, decreasin* the "alue o!
o!!set or hyst can accelerate cell
c ell reselection#
%olution
2odi!y the cell reselection parameter hyst :dB 6K (dB< to speed up
cell reselection so that the UE can
c an select the cell )ith etter 'uality#
Internal Only▲
TABLE OF CONTENT

Part ! "asic Cell Parameter Planning

Part 2 LTE
LTE Call
C all Drop Optimization
Optimiza tion


Part 3 LTE
LTE Cell
C ell Reselection Optimizat
Optimization
ion
Part 4 LTE Coverage Optimization

Part 5 LTE
LTE Hanover
Ha nover Optimizat
Optimization
ion
rans*Re
rans*Regional
gional Co$erage

the trans6re*ional co"era*e usually re!ers to the co"era*e o! some
ase stations e@ceeds the planned scope# %uch prolems are
usually the !ollo)in* solution7
(#
reduce the po)er o! cross6district co"era*e area
+#
reduce the antenna do)n tilt
#
ad5ustin* the antenna an*le
-#
reduce the antenna hei*ht
8#
$eplace the antenna# Use small6*ain antenna# 2echanical do)ntilt
antenna replaced y electronic do)ntilt antenna# Loe )idth is
narro)er eam antenna replacement antenna loe
?# I! the site is too hi*h causin* more area co"era*e, is in"alid in the
case o! other means, you can consider ad5ustin* the net)ork
topolo*y, the relocation site is too hi*h#
o dominant cell

%uch an area is no dominant or leadin* cell, replace cell too
o!ten# This )ill result in !re'uent hando"er, )hich reduces
system e!!iciency,
e!!iciency, increasin* the likelihood o! dropped calls#

Area !or lead6!ree areas should e under the antenna y
ad5ustin* the an*le o! inclination and direction o! the other
methods, and enhance a stron* si*nal area :or close6'uarters<
o! co"era*e, )eaken the other )eak si*nal area :or remote
area< co"era*e#
Inter/erence Anal"sis
(#
=o)nlink inter!erence analysis
%canner =T test y analyin* the recei"ed %IN$ to tar*et#

I! $%$& *ood co"era*e %IN$ !alls elo) a certain threshold, ut
there may e do)n)ard inter!erence# =eterioration o! re*ional identity
out o! the %IN$, check the deterioration o! the re*ion do)nstream

$%$& co"era*e# I! the di!!erence is do)n $%$& co"era*e also
identi!ied as co"era*e issues, co"era*e issues in the analysis to e
addressed# %IN$ !or the $%$& *ood and ad situation reco*nied as
the do)nlink inter!erence prolems ecause o! inter!erence and to
resol"e them#
+#
Uplink inter!erence

Uplink inter!erence prolem 5ud*es y checkin* noise !loor o! site# I!
the noise !loor o! a cell is too hi*h, and there is no e'ui"alent hi*h6
tra!!ic is present, con!irm the presence o! uplink inter!erence
prolems, analysis inter!erence and resol"e#
Anal"sis o/ hando$er

Nei*hor list optimiation !ocus on nei*hor list missin*#
Nei*hor list missin* )ill lead to dropped calls# Throu*h the
dri"e test data analysis so!t)are and statistical analysis, !or
each district to pro"ide nei*hor list added, deleted,
reser"ations recommended#

By ad5ustin* aimuth and do)ntilt o! the antenna, )e chan*e
position o! hando"er area and si*nal distriution# I! the
hando"er area is too small, can sol"ed y reducin* do)ntilt or
ad5ust the aimuth# I! you hando"er one si*nal chan*es too
!re'uently,
!re'uently
, appropriate
aimuth
andchan*e
do)ntilto!ad5ustments
e
considered
to ensure
a smooth
a sin*le cell#could
RF common method o/ o!timi3ation

Antenna aimuth ad5ustment
ad5ustment

Antenna do)ntilt ad5ustment
ad5ustment

Nei*hor list D &CI ad5ustment

Basic )ireless parameters "eri!ication


Ad5ust the antenna hei*ht
hei*ht
Ad5ust the antenna location
location

Ad5ust the antenna connector
connector

to use particular antenna

Ad5ust the accessories, such as the to)er ampli!ier
2odi!ied do)nlink po)er

Antenna do4ntilt calculation /ormula

Antennas do)ntilt !ormula
!ormula (
R ; atan :+4 D L< S ?0 D :+ S p< P  D + 6 eG

Antennas do)ntilt !ormula
!ormula +
R ; atan :4 D L< S ?0 D :+ S p< 6 eG
1here7 R indicates initial antenna mechanical do)ntilt 4 indicates
site e!!ecti"e hei*ht L indicates that the distance et)een antenna
and cell co"era*e ed*e  represents the "ertical loe an*le eG
indicates electronic do)ntilt#
Antenna do4ntilt calculation /ormula
instruction
(#
Formula ( main scenarios7 Under uran dense sites, !or the
most ener*y o! the antenna radiation in the co"era*e area
can reduce the inter!erence o! nei*horin* cells, )hen settin*
the initial do)ntilt, the antennas hal!6po)er point ao"e the
main loe aim at co"era*e ed*e :de!ined as L D +<# 3enerally
not recommended to set initial do)ntilt accordin* to the
!ormula, a"oid the initial inclination may e set too hi*h, )hich
lead to net)ork co"era*e prolems, and more as re!erence o!
optimiation#
+#
Formula +"illa*es,
is the *eneral
the!ar
main
scenarios7
the
suurs,
roads, !ormula,
sea and so
as to
co"er asin
much
as possile, can reduce the initial do)ntilt, so that a ma@imum
*ain o! the antenna main loe is ali*ned on
o n cell ed*e#
Antenna do4ntilt calculation /ormula
instruction
#
The actual )ireless net)ork optimiation, optimiation o! the
antenna set up do)ntilt depends mainly on the analysis o! dri"e
test data to complete#

Accordin* to the %IN$ o! the pilot o"erlay can dra) the co"era*e o!
each sector, the sector !or more area co"era*e, consider
increasin*
the
antenna
tilt,(as
re'uired
theto
an*le
to
increase the
amount
o! do)n
!ormula
can
e usedunder
to re!er
As $F
optimiation o! empirical stron*, many people in this settin* is also
under the an*le and the surroundin* en"ironment#


For the more serious areas co"ered sectors, optimiin* the
antenna set may e *reater than under the dip calculated under
the !ormula o! a much lar*er an*le#
For the co"era*e is insu!!icient, or contaminated areas to e used
in the pilot !re'uency optimal use o! the leadin* sectors do, as lon*
as more areas )ill not e the optimal co"era*e, the antenna is less
than under the dip can e calculated y the !ormula ( under the
an*le, E"en less than calculated y the !ormula + under the an*le#
o4nlin5 !o4er allocation !rinci!le

po)er allocation principle de!ined y 3&& ?#+(

For the OF=2 symol does not contain the $%,

=e!inite ; &=%C46to6$% E&$E ratio
ρA
; δ power-offset
+
PA
VdBW
Amon* them, the δ power -offset only e!!ecti"e
e!!ecti"e multi6user 2I2O,
2I2O, and tthe
he
remainin* "alues are 0dB !ormat# PA UE6speci!ic parameter
con!i*ured y the $$C , its ran*e is V,+,(,0, 6(#QQ, 6, 6-#QQ,
6?W dB#
o4nlin5 !o4er allocation !rinci!le

For the OF=2 symol that contains $%

=e!inition ρ ; &=%C46to6$% E&$E ratio, the "alue o! ρ
)hich pro"ided y the !ollo)in* tale , PB ρ / ρ and the "alue
o! the numer o! antenna port# PB is hi*h6le"el con!i*uration
B
B
B
A
parameter, is cell speci!ic#
ρB / ρ A
PB
.o an& Four Antenna
orts
One Antenna ort
0
(
8D-
(
-D8
(
+
D8
D-

+D8
(D+
o4nlin5 !o4er allocation !rinci!le
1ithin the OF=2 in the presence o! $%, and does not
contain )ithin the OF=2 symol, respecti"ely, the
!ollo)in* e'uation holds#
%in*le antenna port : ρ / ρ S 8< and t)o, !our antenna port : ρ / ρ S
-< #The t)o "alues are e'ual, so the "alue o!
has nothin* to
do )ith the antenna ports#
B
A
B
PC RS
RS _ R E
A
o4nlin5 !o4er allocation !rinci!le

For e@ample, +026and)idth, coupled )ith the ma@imum symol
po)er +0) assumption :-dBm<# 1e can estimate the ran*e o!
re!erence si*nal po)er# Calculated on the asis o! ao"e rule, the
comination o! the "arious possile "alues , ρ / ρ
B
A
PCRS _ RE
PA
and
is,
（ dBm ）
:dB<
Type B
Type A

#8?
(0#-8Q
((#8-
(#0(0
#+0
+
(
(0#-((#Q0
((#-
(+#(
(+#-00
(#+0
(#Q
(-#8Q
(0#+(
((#+(
0
(+#+(
(#0(0
(#Q
(8#++
(+#+(
6(#QQ
(#?
(-#?
(8#+-
(?#+8
(#
6
(-#88
(8#++
(?#0+0
(?#0
(8#++
6-#QQ
(8#Q
(?#(
(?#
(Q#Q(
(?#
6?
A"era*e:<
(?#-Q
(#0(0
(?#
(#QQ
(Q#8Q0
(-#?(
(#+
(8#Q
(#+
(#-(
R% !o4er !arameter confguratio
confguration
n

$% :Cell6speci!ic $e!erence %i*nals &o)er<7 This parameter
indicates the cell re!erence si*nal po)er :asolute "alue<#
$e!erence si*nal is used !or the cell search,
se arch, do)nlink channel
estimation, channel detection, directly impact on cell co"era*e#
This parameter is roadcast y %IB+ notice UE, and in the
)hole system and)idth and the do)nlink su6!rames is all
constant, unless %IB+ messa*e updates :such as the $%6
po)er enhancement<#

$% parameters con!i*uration instructions7 do)nlink po)er
settin*s
are ased
on and
re!erence
si*nal
po)er,
the re!erence
si*nal
po)er
settin*s
chan*e,
a!!ectin*
thesoentire
do)nlink
po)er settin*# $% po)er too lar*e )ill cause pilot pollution,
and inter6cell inter!erence too small )ill cause cell selection or
re6selection !ailure, the data channel cannot demodulation#
Cell ransmit Po4er !arameter
confguration

Cell Transmit &o)er parameter con!i*uration

Cell actually used transmission po)er :Cell Transmit
Transmit &o)er<7
This parameter indicates the actual use o! cell transmit po)er#

Cell Transmit &o)er parameter con!i*uration instructions7
depends on net)ork plannin* and co"era*e is e@pected to
determine the ma@imum cell transmit po)er, oth to ensure
e!!ecti"e
e!!ecti"
e co"era*e and a"oid cross6district co"era*e# This
parameter is the cell total multi6antenna transmit po)er#
-dBm corresponds to +01, -?dBm corresponds to -01#
Internal Only▲
TABLE OF CONTENT

Part ! "asic Cell Parameter Planning

Part 2 LTE
LTE Call
C all Drop Optimization
Optimiza tion

Part 3 LTE
LTE Cell
C ell Reselection Optimizat
Optimization
ion

Part 4 LTE
LTE Coverage
C overage Optimiza
Optimization
tion

Part 5 LTE Hanover Optimization
A 事件的进入条
件为：
Radio Parameters # A&*trigger
A&*triggered
ed
Re!orting

E"ent A related parameters
E"ent A enterin* condition7
lea"in* condition7
Mn + Ofn + Ocn − Hys
>
Mn + Ofn + Ocn + Hys
Ms
<
+
Ms
Ofs
+
+
Ofs
Ocs
+
+
Ocs
Off
+
Off
O! )hich,
Mn7 The measurement result o! the nei*hourin* cell, not takin* into account any o!!sets
Mn7
Ofn77 The !re'uency speci!ic o!!set o! the !re'uency o! the nei*hour cell
Ofn
Ocn7 The cell speci!ic o!!set o! the nei*hour cell, )hich is set to ero i! not con!i*ured !or the
Ocn7
nei*hour cell
Hys77 The hysteresis parameter !or this e"ent
Hys
Ms77 The measurement result o! the ser"in* cell, not takin* into account any o!!sets
Ms
Ofs77 The !re'uency speci!ic o!!set o! the ser"in* !re'uency
Ofs
Ocs7 The cell speci!ic o!!set o! the ser"in* cell, )hich is set to ero i! not con!i*ured !or the
Ocs7
ser"in* cell
Off7 The o!!set parameter !or this e"ent
I! the "alues o! Ofs and Ocs o! the ser"icin* cell are con!i*ured the same as the "alues o!
Ofn and Ocn o! the nei*hor cell durin* the net)ork plannin*, the enterin* condition can
simpli!ied as
A 事件的进入条
件为：
Radio Parameters # A& hreshold
A3 事件的离开条
件为：

a6O!!set

O!! in the enterin*Dlea"in* condition is a6O!!set

Its de!ault "alue is  dB

The recommend "alue is +,  or - dB# A *reater or smaller
"alue is not recommended ecause it may lead to delayed
hando"er and too many hando"ers at a time

This o!!set is applicale to all nei*hor cells
A 事件的进入条
件为：
Radio
Parameters
ters # im
ime
eo
origg
rigger
er
Radio Parame
A3 事件的离开条
件为：

TimeToTri**er :TTT<


This parameter speci!ies the "alue ran*e used !or time to
tri**er parameter, )hich
)hich concerns the time durin* )hich
speci!ic criteria !or the e"ent needs to e met in order to
tri**er a measurement report#
9alue
9a
lue ran*e7 enumerated :0, -0, ?-, 0, (00, (+, (?0, +8?,
+0, -0, 8(+, ?-0, (0+-, (+0, +8?0, 8(+0<

=e!ault "alue7 +0 ms 。

A hi*h T
TTT
TT can p
put
ut o!! measurement reportin* an
and
d reduce
hando"ers#

$ecommended "alues7 +8?, +0, -0, 8(+ or ?-0 ms#
A 事件的进入条
件为：
Radio Parameters # H"steresi
H"steresis
s
A3 事件的离开条
件为：

4ysteresis

4ysteresis, used to ad5ust the
t he enterin*Dlea"in*
threshold o! e"ent6tri**ered reportin*, determines the
period the UE stays at E"ent A
A#
#

=e!ault "alue is 0 。

I! $eportOnLea"e is not enaled ， the recommended
。
"alue is 0
A 事件的进入条
件为：
Radio Parameters # Re!ort+n6ea$e
A3 事件的离开条
件为：

$eportOnLea"e

This parameter indicates )hether or not the
t he UE shall initiate
the measurement reportin* procedure )hen the lea"in*
condition is met#
Mn + Ofn + Ocn + Hys

<
Ms
=e!ault "alue is False :no reportin*<
+
Ofs
+
Ocs + Off
A 事件的进入条
件为：
Radio Parameters # CI+
A3 事件的离开条
件为：

Cell Indi"idual O!!set :CIO<

E"ent A enterin* condiction
Mn + Ofn + Ocn − Hys
>
Ms + Ofs
+
Ocs + Off



Ocn in the !ormula is CIO
Enumerated :6+-,6++,6+0, 6(, 6(?, 6(-, 6(+, 6(0, 6, 6?, 68, 6-,
6, 6+, 6(, 0, (, +, , -, 8, ?, , (0, (+, (-, (?, (, +0, ++, +-<,
unit7 dB
To 'uicken hando"er !rom the ser"in* cell to one nei*hor
cell or to lo)er the hando"er threshold, you can increase the
CIO o! the nei*hor cell y ( to  dB#
A 事件的进入条
件为：
Radio Pa
Parameters
rameters # Re!ortInter$al
A3 事件的离开条
件为：
$eportInter"all and reportAmount
$eportInter"a
andRe!ortAmount

E"ent tri**erin*7 reportInter"al shall e used )ith
reportAmount# 1hen reportAmount is *reater than (,
reportInter"al is "alid#

&eriodical reportin*7 $eportInter"al is the period to report
the measurement

9alue ran*e o! $eportInter"al7 enumerated :(+0, +-0, -0,
9alue
?-0, (0+-, +0-, 8(+0, (0+-0, ?0000, ?0000, Q+0000,
(00000, ?00000<, unit7 ms

9alue ran*e o! $eportAmount7 enumerated :(, +, -, , (?,
9alue
+, ?-, In!inity<, unit7 times

$ecommend "alue !or $eportInter"al is -0ms, and that !or
$eportAmount is -#
A 事件的进入条
件为：
Radio Parameters # &7
A3 事件的离开条
件为：

T0
Timer
Ti
mer )aitin* !or hando"er success


9alue ran*e7 enumerated :80, (00, (80, +00, 800, (000,
9alue
+000<, unit7 ms
=e!ault "alue7 (000 ms
Case %tud"

4ando"err !ailure due to improper radio parameter settin*s
4ando"e

&rolem description

The cluster X&I analysis report sho)s there is aout 8Y call


drop ecause o! 2$ :measurement report< not processed#
In a cluster, the call drops ecause o! 2$ :measurement
report< not processed e"en account !or o"er 80Y o! the call
drops e@cludin* those arisen !rom poor co"era*e#
4ando"er con!i*uration7 %(6ased the hando"er re'uest is
tri**ered )hen the nei*hor cell>s $%$& is #8 dB hi*her
than the ser"in* cell>s#
Case %tud"

&rolem description
Case %tud"

&rolem description

A!ter recei"in* a
hando"er re'uest !rom an
eNB, the 22E processes
the re'uest#

I! the 22E recei"es
another hando"er re'uest
!rom the eNB )ithin (s, it
)ill i*nore this second
hando"er re'uest#
Case %tud"

&rolem analysis

Current parameter con!i*uration

4O &repare Timer ; ( s
:Upon recei"in* one UE>s 2$ re'uest, the source eNB sends the
.hando"er$e'uired/ messa*es to 22E at an inter"al o! ( s#<

Intra6!re'uency $eportin* Inter"al !or E"ent ; (0+- ms

Intra6!re'uency Amount
Amount o! $eportin* !or E"ent ; (
:I! the tar*et cell meets the 2$ reportin* criterion, the UE reports
2$ e"ery (0+-ms and the total times is (#<

I! the UE per!orms hando"er to t)o nei*hor cells one y one
in ( second, and the amount o! reportin* is only (, the
t he
second hando"er re'uest messa*e )ill e ypassed y the
t he
(s timer on the
t he core net)ork side# As a result, the hando"er
!ails and call drop occurs#
Case %tud"

&rolem analysis7 hando"er time se'uence
Case %tud"

&rolem solution
Settin%
arameter
be$ore
a$ter
E/planation
In an %(6ased hando"er, the source eNB
HO Prepare Timer
(s
80 ms
%ntra&'re($ency
Reporting %nterval (0+- ms -0 ms
'or Event
%ntra&'re($ency
Amo$nt
o' (
Reporting
Rep
orting 'or Event
-
sends the 4ando"er$e'uired messa*e to the
core net)ork, and starts this timer A!ter
recei"in* hando"er command !rom the core
net)ork, it stops this timer# I! the timer reports a
timeout, it means an anormality#
The parameter indicates the inter"al to report the
2$s inter"al a!ter e"ent tri**erin*#
The parameter indicates the ma@imum report
times a!ter e"ent tri**erin*#
Reporting
Rep
orting 'or Event
Internal Only▲