3G Signaling Trace and Analysis

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HUAWEI TECHNOLOGIES CO., LTD. 2014-02-21

www.huawei.co

m

24thSEP 2008

UMTS Signaling Trace

and Analysis

Internal


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HUAWEI TECHNOLOGIES CO., LTD.

Contents

1. Trace operation

2. Trace Analysis

3. Trace Analysis Case


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1. Trace operation Standard Trace

Purpose:Analyze the call procedure failure cause by monitoring interworing of the signaling on each

standard interface! interworing of the signaling on the user plane! and uplin and downlin data" #n

combination with a dri$e test! this tas helps to locate problems or deal with complaints from %#P

subscribers"


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&E can be traced by

identify of #'S#!

'S#S()! #'E#! *'S# or

P+*'S#"

&sers can trace

signaling messages of

the &E on #&,! #&-! #&

and && interfaces or ona specified interface"



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1. Trace operation Deug TraceDeug Mode. indicates a

maintenance mode used for

tracing communication

messages between &nits of the

,)C"

*racing tass configured on

/ther! /ther! and -ind tab

pages tae effect only when

(ebug 'ode is selected"


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1. Trace operation Deug Trace

Enable statistics on pacets recei$ed and sent at layer 2 to be reported to the 1'*"


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1. Trace operation Deug TraceSelecting it enables

the ,A) to send the

&E pacets"

Purpose. *his function helps users to determine whether data disconnection eists between a ser$er and

the ,)C or a low rate on the ser$er side causes the low &E rate"


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1. Trace operation Cell TraceC!"" Trace: *his section describes how to trace cell

messages" *he &E statistics can be displayed in the

tracing result if re3uired" *he tracing results of the cell

messages pro$ide reference for troubleshooting

common channel faults when the access success rate

is low or zero in the cell"


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1. Trace operation Cell Trace


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1. Trace operation Cell TraceI#S Trace: *his section describes how to trace a

number of calls that meet the sampling criteria within a

specified range of cells" hen creating the tas! you

can specify the number of calls to be traced and

specify messages to be traced by selecting the e$ent

type"


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Caution 1. *he #/S tracing tas in$ol$es a large amount of trace information! which affects the system

operation" *herefore! the maimum number of simultaneously traced calls set in the Ma$ calls

si%ultaneously tracedarea in the I#Sdialog bo should not be too high" #n addition! you are ad$isednot to trace all e$ents at a time" 5urthermore! you should minimize the fre3uencies of performing this tas

and the number of tass performed simultaneously"

Caution 2. %#P #'S#. ,un the 6A(( &%#P#'S#7 command to add the %#P #'S#"

Caution 3. *his parameter is $alid only when the #'E# 3uery function is enabled on the C) or ,)C side"


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1. Trace operation Trace #n M2&&&


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1. Trace operation Trace #n M2&&&


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1. Trace operation Trace 'e(ie)

Met*od 1. (uring *race! ou can $iew the message at same time"


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Met*od 2. After *race! use 5'A tool open the trace file" 9Suggested:


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Met*od 3. Also can $iew or re$iew *race message on '2000" 9)ot suggested:


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Met*od 3. Also can import trace file to '2000! then re$iew it"


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Contents

1. Trace operation

2. Trace Analysis



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2. Trace Analysis +asic Concept

*ypical

,et)or-

Topology

AndInterace

',S

',C

',S

',C

Core ,et)or-

,ode + ,ode + ,ode + ,ode +

IU IU

Iur

Iu IuIu Iu


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2. Trace Analysis +asic ConceptInterace protocol application part

)-AP 9)ode - Application Part: is the signaling protocol responsible for the control of the )ode - by the

,)C"

,)SAP 9,adio )etwor Subsystem Application Part: is a ;


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2. Trace Analysis +asic Concept

'A+

'+

'",ode+

',C C,U!

UT'A,

'A+ *he ser$ice that the access stratum pro$ides to the non+access stratum for transfer

of user data between &ser E3uipment and C)

'+ *he ser$ice pro$ided by the layer2 for transfer of user data between &serE3uipment and Ser$ing ,)C

'"A =radio lin= is a logical association between single &ser E3uipment and a single

&*,A) access point" #ts physical realization comprises one or more radio bearer

transmissions


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2. Trace Analysis A CS call procedure


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2 T A l i A CS ll d


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2. Trace Analysis A CS call procedure

Call ,elease

,,C ,elease


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Contents

1. Trace operation

2. Trace Analysis


3 T A l i C /IP l i


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3. Trace Analysis Case /IP co%plain

3 T A l i C C ll T


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3. Trace Analysis Case Cell Trace

3 T A l i C " t , t - I


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3. Trace Analysis Case "ocate ,et)or- Issue

#ssue ?? ,)C2;;!2;@ PS #,A*/ low S,

3 T A l i C " t , t - I


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3. Trace Analysis Case "ocate ,et)or- Issue5rom the counter! we got the main reason. %S"#,A*/"5ail/utPS"&E


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3. Trace Analysis Case "ocate ,et)or- Issue


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3G Signaling Trace and Analysis

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