23.4.3 Procedures in the SGSN
29.0023GPPMobile Application Part (MAP) specificationRelease 17TS
23.4.3.1 The Mobile Subscriber is present
If the SGSN successfully handles a Page response, Attach request or Routing Area Update request message (3GPP TS 24.008 [35]), while the MS Not Reachable for GPRS (MNRG) flag is set, the SGSN sends a MAP_READY_FOR_SM request to the HLR. The Alert Reason is set to indicate that the mobile subscriber is present for GPRS. If authentication fails during the handling of a Page response, Attach request or Routing Area Update request, the SGSN shall not send a MAP_READY_FOR_SM request to the HLR
The process in the SGSN is described in detail in clause 25.10.23.
23.4.3.2 The Mobile Equipment has memory available
The process starts when the SGSN receives an RP_SM_MEMORY_AVAILABLE indication from the MS. 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.
The short message alert procedure in the SGSN for the MS memory capacity available case is shown in figure 23.4/6.