UPDATE-7 Update area of ongoing warning in local language. With indication.

Description

Update the alert area of an ongoing cell broadcast in local language. the message is not modified and indication is requested from the network.

WARNING

In principle, the recommended way to handle this type of update is for the CBE to explicitly stop the current alert and start a new one. A new alert means that the CBC will use a new sequence number, which will cause all handsets in the overlapping area to re-play the alert even if they already showed the same message to the user.

Pre-requisites

• Activate a cell broadcast message in local language in a specific area (e.g. following the procedure in TC START-3). For simplicitly, this TC is assumes that the area is fully covered by eNBs controlled by the same MME.
• Alert timing defined so that the broadcast will run for suficient time to execute this test completely.
• Configure the different systems to request SBc-AP indication messages.

Steps to execute

1. CBE sends CAP Alert message (flow 5) with:
   • msgType sub-element set to "Update".
   • references sub-element contains the identifier of the CAP Alert message that triggered the current active broadcast (flow 1).
   • A single info element with the same alert message as in flow 1.
   • Time information that allows the CBC to calculate the repetition period and the number of repetitions set to values that do not change the timing in flow 1.
   • Alert area shall be selected such as one or more new cells are added and one or more old cells are removed from the original alert area in flow 1.

Information flow

Result

A CBC has two different ways to process this update request from the CBE. The result depends on the option implemented.

For both options, verify that after the flow is executed:

1. The value of IE Message Identifier corresponds to the message type for this iteration.

2. Broadcast has stopped in removed cells. I.e. Handsets entering cells removed from the flow 1 alert area that did NOT receive the original alert do NOT alert the user.

3. Nothing changes in overlaping cells. i.e. after the update, the message is still broadcasted with the same sequence number and:

   a. Handsets entering overlapping cells for the alert areas in flow 1 and flow 5 that did NOT receive the original alert DO alert the user.

   b. Handsets in overlapping cells for the alert areas in flow 1 and flow 5 that received the original alert do NOT alert the user.

4. Broadcast has started in the added cells with the same Message Identifier and Serial Number as the in all other cells of the alert area. The value of these two IEs is the same for flow 2 and flow 9.a (for option 1) and flow 6.b (for option 2). As a result:

   a. Handsets in cells added from the flow 1 that did NOT received the original alert DO alert the user.

   b. Handsets in cells added from the flow 1 that received the original alert in another cell DO NOT alert the user.

5. For WRITE-REPLACE WARNING INDICATION procedures, the result of TC START-3) applies.

6. For the STOP WARNING INDICATION procedures, the result of TC STOP-3) applies.

Option 1 - Stop and re-Start

In this option, the CBC completely stops the ongoing campaign and restarts it in the new alert area with the same Serial Number.

Verify that:

1. The values of IEs Message Identifier and Serial Number in flows 2, 6.a and 9.a are identical.

2. The values of IEs List of TAIs (if present) and Warning Area List in flows 2 and 6.a are identical.

3. The Warning Area List in flow 9.a includes the overlapping and the newly added cells and does not include any of the removed cells.

4. The value of IE Repetition Period in flows 2 and 9.a are identical.

5. The value of IE Number of Broadcast Requested in flow 9.a is set to the Number of Broadcast Requested in flow 2 minus the number of broadcast periods that have passed between flow 2 and flow 9.a.

Option 2 - Start in new cells and Stop in removed cells

In this option, the alert area is modified by activating the broadcast of the message in the added cells and stopping it in the removed cells. Nothing needs to be done in overlapping cells.

Verify that:

1. The values of IEs Message Identifier and Serial Number in flows 2, 6.b and 9.b are identical.

2. IE Warning Area List in flow 6.b contains only the new cells added.

3. IE Warning Area List in flow 9.b contains only the removed cells.

4. The value of IE Repetition Period in flows 2 and 6.b are identical.

5. The value of IE Number of Broadcast Requested in flow 6.b is set to the Number of Broadcast Requested in flow 2 minus the number of broadcast periods that have passed between flow 2 and flow 6.b.

Iterations

This TC should be iterated for the alert types in the following table that are applicable in the country in which the CBC is deployed:

Iteration	Alert Type	Message identifier
1	EU-Alert Level 1 \ WEA Presidential	4370 (0x1112)
2	EU-Alert Level 2 \ WEA Extreme	[4371, 4372] ([0x1113, 0x1114])
3	EU-Alert Level 3 \ WEA Severe	[4373 ... 4378] ([0x1115 ... 0x111A)
4	EU-Alert & WEA AMBER	4379 (0x111B)
5	WEA RMT	4380 (0x111C)
6	WEA Exercise	4381 (0x111D)
7	WEA Operator defined use	4382 (0x111E)
8	EU-Alert Level 4 \ WEA Public Safety	4396 (0x112C)
9	WEA State/Local test	4398 (0x112E)
10	EU-Info	6400 (0x1900)