Tracing CS Domain User Messages

This describes how to trace signaling messages on the A/Abis/Um interface on the LMT. Using the IMSI, IMEI, TMSI, MSISDN, or channel to specify a user to be traced

Prerequisites

The LMT runs normally.
The communication between the BSC and the BTS is normal.
The communication between the BSC and the MSC is normal.

Context

For details of Tracing Mode, refer to Tracing Modes.

The following description is based on the configuration using the GOMU.

Procedure

Through GUI
1. On the Trace & Monitor tab page, choose Trace > Trace CS User Message. A dialog box is displayed, as shown in Figure 1.
  Figure 1 Trace User Message dialog box
2. Select Interface Type and Tracing Mode, and set the IMSI, TMSI, MSISDN, IMEI, or Channel.
  NOTE:
  - If you trace the user messages through MSISDN (you are advised to trace the calling ID through the called ID):
    If you trace the calling party, the MSISDN is the called ID, that is, the ID that the MS calls. For example, if the MS calls 12345, then the MSISDN is 12345.
    If you trace the called party, the MSISDN is the calling ID. The MS must be enabled with caller ID display. If 54331 is displayed on the MS, specify the MSISDN with 54321; if 8654321 is displayed on the MS, specify the MSISDN with 8654321.
  - If you trace the user messages through TMSI or IMSI, you must determine the reassignment strategy on the MSC side.
    If TMSI is carried, you can trace the MS through the TMSI.
    If IMSI is carried, you can trace the MS through the IMSI.
  - If you trace the user messages through IMEI, you must determine whether the IMEI is available to the MSC.
3. Click OK.
Through MML
1. Run the CRE USERTRCTASK command on the LMT to create a user message tracing task.

Result

If the operation is successful:
- If the tracing mode is Save on GOMU, the LMT does not display the traced messages. You can review the output file of the traced message. For details, refer to Reviewing Trace Message Files.
- If the tracing mode is Report, a dialog box is displayed, prompting the information of the message tracing task, as shown in Figure 2.
  Figure 2 Tracing user messages
If the operation fails, a dialog box is displayed, prompting the possible causes.

Postrequisite

You can double-click a message to view the detailed information.

Right-click the message to be analyzed. The shortcut menu provides the following options:

Clear Message: Clear the displayed messages.
Stop Scroll: Stop scrolling the displayed messages.
Stop Trace: Stop the current tracing task.
Restart Trace: Restart the tracing task.
View Task: View the established tracing task.
Search: Search for the specified character string in the displayed messages.
Save Selection: Save the selected messages.
Save All: Save all the traced messages.