+ All Categories
Home > Documents > Analysis for Call Drop Due to SRB Reset & TRB Reset (Gaobo40827)_1

Analysis for Call Drop Due to SRB Reset & TRB Reset (Gaobo40827)_1

Date post: 03-Jun-2018
Category:
Upload: anil-khurana
View: 228 times
Download: 0 times
Share this document with a friend
8
  : Internal only  utho r Gao Bo Staff Number 40827 Depar tment UMTS RNP Product Family: Wireless Performance & RNP & RNO Updat e Time 2010-06-01 Product Vension: RNC R10B061  ppro ver Title Analysis for Call Drop due to SRB Reset !RB Reset Pheno menon Descri ption: The problem is that there are many sites have the problem of S!" reset and T!" reset increased# Alarm Inform ation  None Cause Analysi s For this problem$ %e choose the top cells of the !N& '( and !N& (' to analy)e the reason of S!" * T!" reset# From the analyses of the cell &DT and +,S$ -e can .no% that U/ %as doin0 1SDPA traffic #+t did hard handover from one cell to another cell# "ut after hard handover completed$ imminently$ U/ did hard handover bac.$ this is the pin02pon0 phenomena# +t is easy to result in radio lin. lost and the increase of T!"3S!" !eset#For the do%nlin. 4uality chan0ed so fast$ it is abnormal# And this is usually because that the &/556s parameter or cell6s covera0e is unreasonable# And the same phenomena also can find in the cells %ith +D '7789 $'7;'$ '<8(8 $'<88$'<7(= '<7;# From the trace$ %e can see that the U/ hand over from cell '7789 2014-3-1  >?@ BC E 1  , G 8  
Transcript

8/12/2019 Analysis for Call Drop Due to SRB Reset & TRB Reset (Gaobo40827)_1

http://slidepdf.com/reader/full/analysis-for-call-drop-due-to-srb-reset-trb-reset-gaobo408271 1/8

文档名称 文   档 密   :Internal only

  utho

r

Gao Bo Staff Number 40827

Depar

tment

UMTS RNP Product Family: Wireless Performance &

RNP & RNOUpdat

e

Time

2010-06-01 Product Vension: RNC R10B061

  ppro

ver

Title Analysis for Call Drop due to SRB Reset !RB Reset

Pheno

menon

Description:

The problem is that there are many sites have the problem of S!"reset and T!" reset increased#

Alarm

Inform

ation

 None

Cause

Analysi

s

For this problem$ %e choose the top cells of the !N& '( and !N& (' toanaly)e the reason of S!" * T!" reset#

From the analyses of the cell &DT and +,S$ -e can .no% that U/%as doin0 1SDPA traffic #+t did hard handover from one cell to anothercell# "ut after hard handover completed$ imminently$ U/ did hard handoverbac.$ this is the pin02pon0 phenomena# +t is easy to result in radio lin. lostand the increase of T!"3S!" !eset#For the do%nlin. 4uality chan0ed sofast$ it is abnormal# And this is usually because that the &/556sparameter or cell6s covera0e is unreasonable# And the same phenomenaalso can find in the cells %ith +D '7789 $'7;'$ '<8(8 $'<88$'<7(='<7;#

From the trace$ %e can see that the U/ hand over from cell '7789

2014-3-1   >?@ BC E 1 , G 8  

8/12/2019 Analysis for Call Drop Due to SRB Reset & TRB Reset (Gaobo40827)_1

http://slidepdf.com/reader/full/analysis-for-call-drop-due-to-srb-reset-trb-reset-gaobo408271 2/8

文档名称 文   档 密   :Internal only

to cell '7;8 $ but after ( seconds$ it delete the lin. of '7;8# +t is sofast$ and the !5 %as out of synchroni)ation$ then the call drop occurred#

From the measure report$ %e can see that the cell'7;8HPSCRAMBCODE=434I has a better /&3N,$ then the 'A eventhappened successfully#

2014-3-1   >?@ BC E 2 , G 8  

8/12/2019 Analysis for Call Drop Due to SRB Reset & TRB Reset (Gaobo40827)_1

http://slidepdf.com/reader/full/analysis-for-call-drop-due-to-srb-reset-trb-reset-gaobo408271 3/8

文档名称 文   档 密   :Internal only

"ut after ( seconds$ the /&3N, chan0ed so fast and the !5 of thecell '7;8 %as deleted#

2014-3-1   >?@ BC E 3 , G 8  

8/12/2019 Analysis for Call Drop Due to SRB Reset & TRB Reset (Gaobo40827)_1

http://slidepdf.com/reader/full/analysis-for-call-drop-due-to-srb-reset-trb-reset-gaobo408271 4/8

文档名称 文   档 密   :Internal only

Then the !5 %as out of synchroni)ation# And the S+!2/rror value ofthe Uplin. is so bad# The call drop occurred#

And there are many pin02pon0 phenomena as belo%: From the trace

2014-3-1   >?@ BC E 4 , G 8  

8/12/2019 Analysis for Call Drop Due to SRB Reset & TRB Reset (Gaobo40827)_1

http://slidepdf.com/reader/full/analysis-for-call-drop-due-to-srb-reset-trb-reset-gaobo408271 5/8

文档名称 文   档 密   :Internal only

%e .no% that the U/ hand over from '7788 to'7789$ then immediately$hand over bac. to '7788#+t cost only ' or t%o seconds# This isunreasonable# +t is easy to result in radio lin. lost#

From the &DT and +,S$ %e can find the other problem caused thecall drop$ for eJample$ the bad do%nlin. 4uality and the nei0hbor cell notconfi0ured# +f in some position the do%nlin. 4uality is bad$ and the nei0hborcell has not been confi0ured$ the call drop %ill occurred easily#

'I Nei0hbor cell not confi0uredFor cell '7789$ from the +,S trace$ %e can see that it has the problem

of neighbor cell not configured. Just s the cell !!"#3 $e nl%&ed before. 

'ro( the )OS* the u+lin, hs been out of s%nchroni&tion* nd fro( the

RRC-MEAS-RPR* $e cn see tht the do$nlin, of cell !//401PSCRAMBCODE=4/"2 is

bd* nd the E hs re+orted the eent of !A* but fro( the R5C configurtion file* $e

cn6t find the neighbor cell of !//40 $hose PSCRAMBCODE is 7!#. And if the cell the

E detected 1PSCRAMBCODE=7!#2 is configured s the neighbor cell of !//40* this

cll dro+ $ill not occurred. his is coerge +roble(* nd $e need to sole it.

2014-3-1   >?@ BC E 5 , G 8  

8/12/2019 Analysis for Call Drop Due to SRB Reset & TRB Reset (Gaobo40827)_1

http://slidepdf.com/reader/full/analysis-for-call-drop-due-to-srb-reset-trb-reset-gaobo408271 6/8

8/12/2019 Analysis for Call Drop Due to SRB Reset & TRB Reset (Gaobo40827)_1

http://slidepdf.com/reader/full/analysis-for-call-drop-due-to-srb-reset-trb-reset-gaobo408271 7/8

文档名称 文   档 密   :Internal only

-e can see that the U/ %ant to 0o to the D&1$ but From the!!&KL/ASK!P!T %e can find the /&3N, is bad no% %hich means thedo%nlin. is bad$ and the U/ %ould not receive the messa0e of!!&K!"K!/&FM# Then the &all Drop occurred# And from the!!&KL/ASK!P!T$ %e can6t see any other cells that the U/ can

detected#

And %e can see as belo%: +f the do%nlin. is 0ood$ the U/ %ill 0o to

2014-3-1   >?@ BC E ! , G 8  

8/12/2019 Analysis for Call Drop Due to SRB Reset & TRB Reset (Gaobo40827)_1

http://slidepdf.com/reader/full/analysis-for-call-drop-due-to-srb-reset-trb-reset-gaobo408271 8/8

文档名称 文   档 密   :Internal only

D&1 successfully#

)t cn be soled b% o+ti(i&ing the +r(eter nd the coerge of the

net$or,.

Handli

ng

Process

The pin02pon0 phenomena is bnor(l* nd the logs sho$s tht the

cll dro+s $ere due to the coerge of cells nd the +r(eters configured.

Sugges

tions

and

summa

ry

Attach

ments

Relate

d

docum

ent

link 

2014-3-1   >?@ BC E 8 , G 8  


Recommended