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GSM 09.02 - Version 5.3.0 - Digital cellular telecommunications - ETSI

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20 Short message service procedures<br />

20.1 General<br />

Page 549<br />

<strong>GSM</strong> <strong>09.02</strong> <strong>Version</strong> <strong>5.3.0</strong>: August 1996<br />

The short message service procedures are used to control both mobile originated and mobile terminated<br />

short message transfer.<br />

Four procedures exist for short message services:<br />

- mobile originated short message service transfer;<br />

- mobile terminated short message service transfer;<br />

- short message alert procedure;<br />

- short message waiting data set procedure.<br />

The following application context refers to a complex MAP user consisting of several processes:<br />

- shortMessageGatewayContext.<br />

This application context needs a co-ordinating process in the HLR. Additionally a Co-ordinator has to be<br />

defined for the mobile originated situation in the MSC, because the A_CM_SERV_REQ message does not<br />

distinguish between mobile originated short message transfer and the short message alert procedures.<br />

20.1.1 Mobile originated short message service Co-ordinator for the MSC<br />

The A_CM_SERV_REQ message (TS <strong>GSM</strong> 04.08) is received from the A-interface containing the CM<br />

service type. This parameter indicates mobile originated short message service. The service<br />

MAP_PROCESS_ACCESS_REQUEST is started.<br />

If the MAP_PROCESS_ACCESS_REQUEST service ends successfully, the mobile station initiates mobile<br />

originated short message transfer or alerting indication. Depending on the situation, the appropriate<br />

process is initiated as follows:<br />

- if the A_RP_MO_DATA indication is received, the process MOSM_MSC is initiated (see<br />

subclause 20.2.1);<br />

- if the A_RP_SM_MEMORY_AVAILABLE indication is received, the process SC_Alert_MSC is<br />

initiated (see subclause 20.4.1).<br />

After creation of the user process the Co-ordinator relays the messages between the A-interface and the<br />

invoked process until a request or an indication for dialogue termination is received.<br />

The SMS process Co-ordinator is shown in the figure 20.1/1.

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