3 g signaling_trace_and_analysis

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

www.huawei.com

24th SEP 2008UMTS Signaling Trace UMTS Signaling Trace

and Analysisand Analysis

Internal

HUAWEI TECHNOLOGIES CO., LTD.


1. Trace operation Standard Trace

Purpose: Analyze the call procedure failure cause by monitoring interworking of the signaling on each standard interface, interworking of the signaling on the user plane, and uplink and downlink data. In combination with a drive test, this task helps to locate problems or deal with complaints from VIP subscribers.


UE can be traced by identify of IMSI, MSISDN, IMEI, TMSI or P-TMSI.

Users can trace signaling messages of the UE on IUR, IUB, IU and UU interfaces or on a specified interface.



1. Trace operation Debug TraceDebug Mode: indicates a maintenance mode used for tracing communication messages between Units of the RNC. Tracing tasks configured on Other, Other1, and Bind tab pages take effect only when Debug Mode is selected.


1. Trace operation Debug Trace

Enable statistics on packets received and sent at layer 2 to be reported to the LMT.


1. Trace operation Debug TraceSelecting it enables the RAN to send the UE packets.

Purpose: This function helps users to determine whether data disconnection exists between a server and the RNC or a low rate on the server side causes the low UE rate.


1. Trace operation Debug Trace


1. Trace operation Cell TraceCELL Trace: This section describes how to trace cell messages. The UE statistics can be displayed in the tracing result if required. The tracing results of the cell messages provide reference for troubleshooting common channel faults when the access success rate is low or zero in the cell.


1. Trace operation Cell Trace


1. Trace operation Cell TraceIOS Trace: This section describes how to trace a number of calls that meet the sampling criteria within a specified range of cells. When creating the task, you can specify the number of calls to be traced and specify messages to be traced by selecting the event type.



Caution 1: The IOS tracing task involves a large amount of trace information, which affects the system operation. Therefore, the maximum number of simultaneously traced calls set in the Max calls simultaneously traced area in the IOS dialog box should not be too high. In addition, you are advised not to trace all events at a time. Furthermore, you should minimize the frequencies of performing this task and the number of tasks performed simultaneously.Caution 2: VIP IMSI: Run the ADD UVIPIMSI command to add the VIP IMSI.

Caution 3: This parameter is valid only when the IMEI query function is enabled on the CN or RNC side.


1. Trace operation Trace On M2000


1. Trace operation Trace Review

Method 1: During Trace, You can view the message at same time.



Method 2: After Trace, use FMA tool open the trace file. (Suggested)



Method 3: Also can view or review Trace message on M2000. (Not suggested)



Method 3: Also can import trace file to M2000, then review it.


2. Trace Analysis Basic ConceptTypical Network Topology And Interface

RNS

RNC

RNS

RNC

Core Network

Node B Node B Node B Node B

IU IU

Iur

Iub IubIub Iub


2. Trace Analysis Basic ConceptInterface protocol application part

NBAP (Node B Application Part) is the signaling protocol responsible for the control of the Node B by the RNC.

RNSAP (Radio Network Subsystem Application Part) is a 3GPP signaling protocol responsible for communications between RNCs. It is carried on the lur interface and provides functionality needed for soft handovers and SRNS relocation.


2. Trace Analysis Basic Concept

RAB

RB

RLNodeB

RNC CNUE

UTRANRAB The service that the access stratum provides to the non-access stratum for transfer of user data between User Equipment and CNRB The service provided by the layer2 for transfer of user data between User Equipment and Serving RNCRL A "radio link" is a logical association between single User Equipment and a single UTRAN access point. Its physical realization comprises one or more radio bearer transmissions


2. Trace Analysis A CS call procedure


RRC Connect

Authentication& Security

Call process

RAB Assignment


Call Connect



Call Release

RRC Release


3. Trace Analysis Case VIP complain


3. Trace Analysis Case Cell Trace


3. Trace Analysis Case Locate Network IssueIssue RNC233,235 PS IRATHO low SR


3. Trace Analysis Case Locate Network IssueFrom the counter, we got the main reason: VS.IRATHO.FailOutPS.UEGen. It means that RNC sends Cell change order from UTRAN to let the UE HO to GSM. If before RNC receive IU release command from CN, UE reselect to 3G and require a RRC connection. The counter will count.


3. Trace Analysis Case Locate Network Issue


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3 g signaling_trace_and_analysis

Engineering

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