Tracing PS Domain Messages on the Um Interface

This describes how to trace the PS domain messages on the Um interface based on the specified TRX or cell on the LMT when the PCU is installed inside the BSC. The messages consist of DUMMY message, system message, null paging message, and data block message. It can be used to check the information about the signaling interaction process of the PS service between the BTS and the MS, which helps identifying the PS problem.

Prerequisites

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

Context

For details of Message Type, refer to Message Types.

For details of Tracing Mode, refer to Tracing Modes.

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

Procedure

On the Trace & Monitor tab page, choose Trace > Trace PS Message > Trace Um Interface Message. A dialog box is displayed, as shown in Figure 1.
Figure 1 Trace PS Message on the Um Interface dialog box
Set parameters in the Location and Tracing Mode areas, and select Save File.
CAUTION:
Save the files according to the interface names. For the long-time trace, you must select autosave.
Click OK.

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 Trace PS Message on the Um Interface dialog box
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.