The test set gives you access to the protocol layers necessary to allow you to observe the SMS cell broadcast and point-to-point messages. You can capture all the messages exchanged between either the LLC or the RR and these protocol layers:
The messages in the following tables are examples of messages related to SMS. The table indicates whether each is supported in the test set. There may be more messages supported by the test set or by the Wireless Protocol Advisor. In addition, certain parameters in these messages may not be supported.
|Mobile-Terminated SMS Parameters on Test Set||Parameters in 3GPP TS 23.040||Message Types|
|Content||TP-User Data (TP-UD) - 184.108.40.206||Deliver, Submit Report, Status Report|
|TP-Message Type Indicator (TP-MTI) - 220.127.116.11|
|Data Coding Scheme||
TP-Data Coding Scheme (TP-DCS) - 18.104.22.168
(Defined in 3GPP TS 23.038)
|Deliver, Submit Report, Status Report|
|Failure Cause||TP-Failure Cause (TP-FCS) - 22.214.171.124||Submit Report if RP type is set to RP-ERR|
|Message Reference||TP-Message Reference (TP-MR) - 126.96.36.199||Status Report|
|More Messages to Send||TP-More Messages to Send (TP-MMS) - 188.8.131.52||Deliver, Status Report|
|Parameter Indicator||TP-Parameter Indicator (TP-PI) - 184.108.40.206||Submit Report, Status Report|
|Protocol Identifier||TP-Protocol Identifier (TP-PID) - 220.127.116.11||Deliver, Submit Report|
|Reply Path||TP-Reply Path (TP-RP) - 18.104.22.168||Deliver|
|Status||TP-Status (TP-ST) - 22.214.171.124||Status Report|
|Status Report Indication||TP-Status Report Indication (TP-SRI) - 126.96.36.199||Deliver|
|User Data Header Indicator||TP-User Data Header Indication (TP-UDHI) - 188.8.131.52||Deliver, Submit Report, Status Report|
|Originating Address||TP-Originating Address (TP-OA) - 184.108.40.206||Deliver|
|Recipient Address||TP-Recipient Address (TP-RA) - 220.127.116.11||Status Report|
|Mobile-Originated SMS Parameters available for query from the test set||Parameters in 3GPP TS 23.040|
|Coding Scheme||TP-Data Coding Scheme (TP-DCS) - 18.104.22.168 (Defined in 3GPP TS 23.038)|
|User Data Length||TP-User Data Length (TP-UDL) - 22.214.171.124|
|Destination||TP- Destination Address (TP-DA) - 126.96.36.199|
|Content||TP-User Data (TP-UD) - 188.8.131.52|
|Reference No.||TP-Message Reference (TP-MR) - 184.108.40.206|
|UDHI||TP-User Data Header Indication (TP-UDHI) - 220.127.116.11|
|Protocol Identifier||TP-Protocol Identifier (TP-PID) - 18.104.22.168|
|Status||TP-Status Report Request (TP-SRR) - 22.214.171.124|
You can use the Wireless Protocol Advisor (WPA) to log the messages exchanged between the test set and the mobile station during SMS procedures. This tool provides a means to evaluate the mobile station's performance and to troubleshoot problems.
You can set up the WPA to capture and display as much or little information as you want. For this example, the logging filter is defined to capture only SMS protocol messages. The view filter is configured to only display the SMS CP-Data messages. This allows you to view only the messages that contain the SMS message contents being exchanged between the mobile station and the test set.
The logging filter is useful for limiting what messages get captured in your log. Using this filter, you can choose to only log certain types of messages from certain protocol layers. In this example, we are using the logging filter to limit the captured log to SMS protocol messages.
The view filter has no effect on what messages are captured. It simply limits the messages that are visible on the WPA's traffic overview. The view filter can easily be enabled and disabled by right clicking your mouse in the traffic overview and selecting
View Filter Enabled
from the menu that appears.
For the step-by-step procedure for setting up the test set to capture this log, refer to Mobile Originated Point-to-Point Message Transfer .
The captured log allows you to determine exactly what is being exchanged between the test set and the mobile station. In this example, an SMS message was sent from the mobile station to the test set. You can look in the decode of the captured message to verify all the parameters associated with that message. The following data is only a portion of the decode belonging to the captured message. In this data, you can see the text message that was sent to the test set. Look at the letters in
SM Value =
|27||00000110||06||User Data Length=6 octet(s)|
|28||00100000||c8||SM Value = HELLO!|
Keysight's Wireless Protocol Advisor (WPA) allows you to capture the cell broadcast messages sent from the test set to the mobile station, and can be used to troubleshoot the handling of received messages. The figure below is a protocol log captured from WPA when the Cell Broadcast Service has been started and the repetition period is set to 15 seconds. The protocol log below shows the message activity necessary to transmit a 3-page cell broadcast message two different times. The test set only sends one page of the message to the mobile station at a time. The message decode of the selected message (dark blue) is shown in the bottom portion of the figure. The message decode shows several parameters, including the number of pages in the message as well as the page number of the selected page.