Over The Air Parameter Administration (OTAPA)
3.0 Feature Call Flows
3.5.3 SMS Message Flow Using ADDS, Control Channel
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This section contains examples of SMS delivery on the control channel.
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3.5.3.1 SMS Broadcast Delivery over the Paging Channel
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This section provides the call flow description for SMS Broadcast delivery over the
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Paging channel.
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MS BS MSC
time comment
b c
ADDS Page Ack ADDS Page a
Paging Channel SMS Broadcast Delivery
T3113
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Figure 3.5.3.1-1 SMS-Broadcast Delivery to Mobile Stations over
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the Paging Channel.
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a. The MSC receives SMS Broadcast information for delivery to idle mobile
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stations.
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The MSC sends an ADDS Page message to the BS. The ADDS Page contains
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the SMS Broadcast message in its ADDS User Part information element.
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If the MSC requires an acknowledgment to the ADDS Page message, the Tag
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element shall be included in the ADDS Page message. The MSC starts timer
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T3113.
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b. If the MSC requested an acknowledgment from the BS by including the Tag
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element in the ADDS Page message, the BS replies with an ADDS Page Ack
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message including the Tag element set to the same value as received from the
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MSC. The MSC stops timer T3113.
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c. The BS sends the SMS Broadcast information to the appropriate mobile
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stations over the Paging channel. Layer 2 Acks are not requested by the BS
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from the mobile stations receiving the SMS broadcast message.
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3.5.3.2 SMS Delivery to a Mobile Station on the Paging Channel - Example 1
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This section provides the call flow description for the delivery of an SMS-MT message
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on the paging channel.
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MS BS MSC
time comment
b
c ADDS Page Ack d
Layer 2 Ack
a ADDS Page
Paging Channel SMS Delivery T3113
Conditional Conditional
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Figure 3.5.3.2-1 SMS-MT Delivery to a Mobile Station on the
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Paging Channel - Example 1
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a. The MSC determines that a point-to-point short message is to be sent to an
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idle mobile station.
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The MSC sends an ADDS Page message to the BS. The ADDS Page contains
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the short message in its ADDS User Part information element.
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If the MSC requires an acknowledgment, it will include the Tag information
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element in the ADDS Page message. It will also start timer T3113.
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b. The BS sends the short message to the MS on the paging channel. Before
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sending the short message, the BS may perform vendor specific procedures
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such as paging the MS to determine the cell in which the MS is located.
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c. If a Layer 2 Ack was solicited, the MS acknowledges the receipt of the
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message by a Layer 2 Ack.
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d. If the MSC requested an acknowledgment by including the Tag information
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element in the ADDS Page message, the BS replies with an ADDS Page Ack
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message including the Tag information element set identical to the value sent
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by the MSC. If timer T3113 was previously started, it will now be stopped.
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3.5.3.3 SMS Receipt from a Mobile Station on the Access Channel
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This section provides the call flow description for the receipt of an SMS-MO message on
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the access channel.
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Time
a b c
MS BS MSC
ADDS Transfer Access Channel SMS Delivery
Layer 2 Ack
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Figure 3.5.3.3-1 SMS-MO Delivery on the Access Channel
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a. The MS sends a point-to-point SMS message to the network on the access
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channel.
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b. If the MS had requested a Layer 2 Ack, the BS acknowledges the short
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message received on the access channel by sending a Layer 2 Ack on the
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paging channel.
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c. The BS sends an ADDS Transfer message to the MSC containing the SMS
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message received from the MS in the ADDS User Part element.
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3.5.3.4 SMS Delivery to a Mobile Station on the Paging Channel - Example 2 without
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Early Traffic Channel Assignment
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This section provides an example call flow description for the delivery of an SMS-MT
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message on the Paging Channel without early traffic channel assignment by the BS. In
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this example, the mobile station is held on the control channel until the SMS messages
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are delivered. After delivery, the mobile station is released.
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MS BS MSC
time comment
g h ADDS Page Ack i
Layer 2 Ack
ADDS Page f Paging Channel SMS Delivery T3113
b a Paging Request
Base Station Ack Order
T3113
c Complete L3 Info: Paging Response d
Page Response Message Page Message
MSC releases underlying transport connection
k Release Order l
Release Order
e
j
Optional Optional T303
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Figure 3.5.3.4-1 SMS-MT Delivery to a Mobile Station on the
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Paging Channel - Example 2
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a. The MSC sends a Paging Request message to the BS and starts timer T3113.
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b. The BS sends a Page Message on the paging channel.
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c. The MS responds with a Page Response Message.
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d. The BS sends a Complete Layer 3 Information message containing a Paging
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Response message to the MSC. The MSC stops timer T3113.
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e. The BS sends a Base Station Ack Order to acknowledge the Page Response
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Message from the MS.
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f. If the Radio Environment and Resources element in the Page Response
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message indicates no early traffic channel assignment by the BS, the MSC
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sends an ADDS Page message to the BS. The ADDS Page contains the short
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message in its ADDS User Part information element.
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If the MSC requires an acknowledgment, it will include the Tag information
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element in the ADDS Page message. It will also start timer T3113.
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g. The BS sends the short message to the MS.
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h. The MS acknowledges the receipt of the message by a Layer 2 Ack.
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i. If the MSC requested an acknowledgment by including the Tag information
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element in the ADDS Page message, the BS replies with an ADDS Page Ack
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message including the Tag information element set identical to the value sent
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by the MSC. If timer T3113 was previously started, it will now be stopped.
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j. The MSC releases the underlying transport connection to clear the pending
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page response.
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k. The BS, upon the release of the underlying transport connection, sends a
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Release Order to the MS.
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l. The MS sends a Release Order to the BS to acknowledge the release.
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3.5.3.5 SMS Delivery to a Mobile Station on the Paging Channel - Example 3 with Early
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Traffic Channel Assignment
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This section provides an example call flow description for the delivery of an SMS-MT
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message on the Paging Channel with early traffic channel assignment by the BS.
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MS BS MSC
time comment
g h i
ADDS Page Ack Layer 2 Ack
f
ADDS Page Paging Channel SMS Delivery
T3113
b a Paging Request
Base Station Ack Order
T3113
c Complete L3 Info: Paging Response d
Page Response Message Page Message
(MSC releases underlying transport connection)
k l Release Order
Release Order
e
j
Optional Optional T303
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Figure 3.5.3.5-1 SMS-MT Delivery to a Mobile Station on the
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Paging Channel - Example 3
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a. The MSC sends a Paging Request message to the BS and starts timer T3113.
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b. The BS sends a Page Message on the paging channel.
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c. The MS responds with a Page Response Message.
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d. The BS sends a Complete Layer 3 Information message containing a Paging