23.2.3 Procedure in the SGSN

29.0023GPPMobile Application Part (MAP) specificationRelease 17TS

Any CAMEL-specific handling defined in this clause is omitted if the SGSN does not support CAMEL control of MO SMS, or if the subscriber does not have a subscription for CAMEL control of MO SMS.

The process starts when the SGSN receives a short message received from the MS over the Gb interface. The MAP process invokes macros not defined in this clause; the definitions of these macros can be found as follows:

Receive_Open_Cnf see clause 25.1.2;

Check_Confirmation see clause 25.2.2.

Sheet 2: If the capacity of a message signal unit in the lower layers of the protocol is enough to carry the content of the MAP_OPEN request and the content of the MAP_MO_FORWARD_SHORT_MESSAGE request in a single TC message, the test "Message segmentation needed" takes the "No" exit; otherwise the test takes the "Yes" exit.

Sheet 2:The decision box "TCAP Handshake required" takes the "yes" or "no" exit depending on agreements between the serving SGSN’s operator and the SMS-IWMSC’s operator (see 3GPP TS 33.204 [34a]).

The mobile originated short message service process in the SGSN is shown in figure 23.2/4.