PRACTICAL REASONS AND NORMS DE JOSEPH RAZFull description
Descripción: Reasons (Piano Score)
Report NetackFull description
Reasons (Piano Score)
KPI'sFull description
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This presentation covers Call Setup Analysis with a Drive Testing perspective. It goes through the signaling as well as briefs the common causes of call setup failure.
excellent analysis of call setup-1
WCDMA RNO Call Drop Problem Analysis
hdsadFull description
Every Act of the Parliament commences with a preamble which consists of the introductory words "An Act to¦¦ followed by words briefly describing its objects. The preamble of a statute may be relied upon as aid to the understanding of the meaning ther
presentation in BIO 199bFull description
Scaffolding Practice
Behaviour
Problem
Description
Call set-up failure
Poor coverage area
$f problem is poor coverage% this means poor &SCP '(-)* dBm+ thus also the ,co derades ver rapidl '( -0 dB+ hen the coverage border is reached.
Poor dominance area.
o main server in the area% too man cells ith ea1 CP$CH level.
Call drop
Call set-up failure
Call drop
Call set-up failure
CP$CH ,co is usuall ver bad even the &SCP is good e.2. &SCP 3456-)5 dBm but ,co about 35 dB
Pilot Pollution
Call drop
Dropped Dropp ed call/SH call/SHO O failure failure Miss Missing ing neighbo neighbour ur
Bad CP$CH ,c/$o '(-0 dB+ level although CP$CH &SCP level is good. High site in the neighbourhood ma cause interference.
7 good usable neighbour is present ithin cells coverage area% can cause D8 interference if it is not in the active set.
Sapped sectors in !B"S. Call set-up #ailure
High Pr9"otal due to :8 ,9ternal interference
"he Pr9"otal level is significantl higher than e9pected in no/lo load conditions.
Call drop
Call set-up failure
High Pr9"oatal due to rong "he Pr9"otal level is significantl MH7 settings higher than e9pected in no/lo load conditions.
Call drop
Call set-up failure
MH7 settings should be chec1ed% see more in reference ;<=
High Pr9total due to $nstallation problems
"he Pr9"otal level is significantl higher than e9pected in no/lo load conditions.
Cell set-up failure
Bad &&C connection set-up success rate due to slo :e cell reselection
&&C connection set-up complete message not heard b B"S.
8ong call set-up time
8ong time interval for snc beteen &C and B"S before connection
"he value of Parameter >0 is too high? ma9imum number of @in sncA indications received from 8 during the establishment of a phsical channel
Call drop
Dropped call
SHO to rong cell ill cause Overshooting cell come temporaril drop call. into active set and forces a suitable serving cell to be dropped out. 8ater &SCP suddenl drops in the @rong cellA and causes a dropped call because there is no neighbour defined.
Dropped call
Cell suffering from :8 interference D8 'CP$CH+ coverage much bigger than :8 coverage
7s the :, "9 poer is not enough for target cell snchronisation% the SHO fails hich ill cause call drop later.
Dropped call
D8 CP$CH coverage (
Cell ith loer CP$CH poer than the surrounding is having @too goodA :8 performance% as this cells :8 cannot be used efficientl due to SHO is decided upon D8 'CP$CH ,c/o+.
Dropped call
&ound the corner effect
"he call drops due to too rapid CP$CH coverage degradation for Cell 7% and therefore there is not enough time for SHO.
Dropped call/SHO failure "oo man neighbours
$n SHO area the number of combined neighbouring cells become more than >.HO list is created using &C algorithm in the final stage some of the neighbours ill randoml be removed.
Possible solutions Chec1 7ntenna line installation 'antenna position and 2ualit% cable length and 2ualit+.
Chec1 that CP$CH poers are balanced beteen the studied cells.
Chec1 presence of shadoing obstacles.
7dd a site to the area. :se buildings and other environmental structures to isolate cell's+ coverage.
Don tilt antennas to ma1e cells dominant and limit effects of interfering cell's+.
Chec1 antenna bearing. 7dd a site. #ind interfering cell from Scanner results. 7dEust antenna bearing and don tilt or loer the antenna height 'too much tilt ill brea1 the dominance+.
7dd interfering cell to the neighbour of the serving cell. Chec1 scanner data and loo1 for missing neighbours.
Chec1 the cabling in antenna line. "r to figure the possible area/direction of the interference b chec1ing Pr9"otal level on neighbouring cells.
7lternativel use spectrum analser F directive antenna to locate interferer.
$nform operator/regulator about the found conditions. Chec1 if auto tuning range is large enough '05 dB+. $n case of MH7 is used in B"S chec1 MH7 and cables loss parameters% otherise Pr9"otal value ill be too high.
'$f MH7 parameter is set to O% Cable loss parameter is used% Cable loss &eal MH7 gain #eeder loss parameter+ Chec1 the antenna installation as the last alternative in high Pr9oise case.
Set parameters so that reselection process ill start earlier?
G2ualmin% Sintrasearch and Ghst0 as per latest recommendation ;4= :se smaller value >0 '0% recommendation is +. :se 7cti9 for chec1ing the call set-up dela '8> messages+.
:se call set-up time optimisation feature Dnamic setting of @7ctivation"imeOffsetA 'possible in &7.*.0 ,D0+ enables 055 to *55ms reduction for set up dela.
Pan aa overshooting cell if it is too close to the serving cell% otherise appl don tilting as ell.
:se cell individual offset 'negative value+ parameter to balance the D8 and :8 coverage.
Chec1 traffic direction of in-car :,s to decide hich cell re2uires offsets. :se cell individual offset 'positive value+ parameter to balance the D8 and :8 coverage.
ote? Cell individual offsets are not ta1en into account hen calculating the added cell "9 poer. :se cell individual offset 'positive value+ parameter to balance the D8 and :8 coverage.
ote? Cell individual offsets are not ta1en into account hen calculating the added cell "9 poer.
