LTE Signaling Tracing

(1)

1 Signaling Tracing over Standard Interfaces

Signaling messages over standard interfaces, including S1, X2, and Uu interfaces, can be traced on the Web LMT or U2000.

1 _{Signaling Tracing on the Web LMT}

In the Web LMT window, click the Trace tab page. In the navigation tree on the left, choose

Trace > Interface Trace Task, double-click S1 Trace, X2 Trace, or UU Trace to trigger the

corresponding tracing task.

1 Signaling Tracing on the S1 Interface

(2)

Field

Name Description

Trace Direction

Specifies the direction of messages to be traced on the S1 interface. It can be set to Trace Both, Trace Sender, or Trace Receiver.

Trace Type Specifies the MME to trace. It can be set to All MME or Specific MME. If Specific MME is selected, enter the S1 interface ID so that messages related to this MME can be traced. Otherwise, messages related to all MMEs will be traced.

Message Type

Specifies the type of messages to be traced over the S1 interface. You can set it to Select All to trace all messages or select one or more message types to trace messages of specified types.

Autosave to File

If you select Autosave to File, the tracing result will be automatically saved. You can set the file path and file name. The file format is .tmf by default.

(3)

3 Save the tracing result.

Right-click the trace task and choose Stop Trace Task from the shortcut menu to stop the task. Then, right-click the task and choose Save All Messages to save the results to the local PC in .tmf format.

A maximum of 12 tracing tasks over the S1 interface can be executed simultaneously, and parameters of two tasks cannot be identical. You can trace messages related to a maximum of 16 MMEs over one S1 interface

2 Signaling Tracing on the X2 Interface

(4)

Field Name Description

Trace Direction Specifies the direction of messages to be traced on the X2 interface. It can be set to Trace Both, Trace Sender, or Trace

Receiver.

Trace Type Specifies the eNodeB to trace. It can be set to All eNodeB or

Specific eNodeB. If Specific eNodeB is selected, enter the

eNodeB ID and PLMN so that messages related to this eNodeB can be traced. Otherwise, messages related to all eNodeBs will be traced.

Message Type Specifies the type of messages to be traced over the X2 interface. You can set it to Select All to trace all messages or select one or more message types to trace messages of specified types. Autosave to File If you select Autosave to File, the tracing result will be

automatically saved. You can set the file path and file name. The file format is .tmf by default.

(5)

A maximum of 12 tracing tasks over the X2 interface can be executed simultaneously, and parameters of two tasks cannot be identical. You can trace messages related to a maximum of 16 eNodeBs over one X2 interface.

3 Signaling Tracing on the Uu Interface

(6)

Field Name Description

Trace Direction Specifies the direction of messages to be traced on the Uu interface. It can be set to Trace Both, Trace Sender, or Trace

Receiver.

Trace Type Specifies the cell to trace. It can be set to All Cell or Specific

Cell. If Specific Cell is selected, enter the Cell ID so that

messages related to this cell can be traced. Otherwise, messages related to all cells will be traced.

Message Type Specifies the type of messages to be traced over the Uu interface. You can set it to Select All to trace all messages or select one or more message types to trace messages of specified types. Autosave to File If you select Autosave to File, the tracing result will be

automatically saved. You can set the file path and file name. The file format is .tmf by default.

2 View the tracing result.

(7)

A maximum of 12 tracing tasks over the Uu interface can be executed simultaneously, and parameters of two tasks cannot be identical. You can trace messages related to a maximum of 11 cells over one Uu interface.

2 Signaling Tracing on the U2000

On the menu bar of the U2000, choose Monitor > Signaling Trace > Signaling Trace

Management.

In the displayed window, expand the trace navigation tree, and double-click S1 Interface

Trace, X2 Interface Trace, or Uu Interface Trace of the Application Layer node to trigger

(8)

1 Signaling Tracing on the S1 Interface

1 Create a tracing task.

Double-click S1 Interface Trace. In the displayed Create Trace Task dialog box, as shown in the following figure, specify the tracing task name and select a device in the navigation tree.

In the S1 Interface Trace dialog box, configure Report Type, Trace Direction, Trace

Inclusion (All MME or Specific MME), and Message Type (recommended value: Default).

Two report types can be selected: Message Report and File Report. In Message Report mode, the eNodeB sends signaling messages in real time to the U2000 server, which greatly affects the U2000 performance. In File Report mode, the eNodeB records signaling messages in a file, and periodically sends the file to the U2000 server, which only slightly affects the U2000 performance. When this mode is selected, you need to specify Report Period

(9)

number to trace. If you need to trace messages over all the links, set Trace Inclusion to ALL

MME. If you select Specific MME, you need to specify the S1 link ID. If there are multiple

ID numbers, separate them using a slash (/). For the description of other fields, see section 1"Signaling Tracing on the Web LMT."

Right-click the trace task and choose Stop from the shortcut menu. If the task status is Finished, click Export to save the tracing result to the PC in .tmf format.

(10)

2 Signaling Tracing on the X2 Interface

Double-click X2 Interface Trace. In the displayed Create Trace Task dialog box, as shown in the following figure, specify the tracing task name and select a device in the navigation tree.

In the X2 Interface Trace dialog box, configure Report Type, Trace Direction, Trace

Inclusion (All eNodeB or Specific eNodeB), and Message Type (recommended value: Default).

(11)

(12)

3 Signaling Tracing on the Uu Interface

Double-click Uu Interface Trace. In the displayed Create Trace Task dialog box, as shown in the following figure, specify the tracing task name and select a device in the navigation tree.

In the Uu Interface Trace dialog box, configure Report Type, Trace Direction, Trace

Inclusion (All Cell or Specific Cell), and Message Type (recommended value: Default).

(13)

4 Virtual UE Message Tracing

In the tracing navigation tree of U2000, expand the Global node. Double-click LTE Virtual

(14)

Double-click LTE Virtual UE Trace. In the displayed LTE Virtual UE Trace dialog box, as shown in the following figure, specify Trace name and User trace ID.

(15)

(16)

3 End-to-End User Tracing (Not Supported By

V200R012)

On the menu bar of the U2000, choose Monitor > Signaling Trace > Signaling Trace

(17)

In the tracing navigation tree, expand the LTE/EPC node, and double-click LTE/EPC

End-to-End User Trace to trigger a tracing task.

In the LTE/EPC End-to-End User Trace dialog box, enter the trace name, the IMSI number of the user to be traced. By default, the tracing task reference number is randomly allocated. In the NE Settings area, select User-Registered MME.

(18)

Right-click the tracing task and choose Export from the shortcut menu to export the traced data to the local PC. In the exported data, data starting with USN is traced over standard interfaces on the core network, and data starting with an eNodeB name is traced on standard interfaces of eNodeBs. (Data traced over Uu, S1, and X2 interfaces are saved in this file). If the UE moves between multiple cells managed by the U2000, interface information for each eNodeB is recorded in an independent .tmf file.

(19)