Structure of the scheduling center

 Structure of the scheduling center

• MO process
  In the MO process, after a mobile subscriber submits an SM to the SMCAPP, the BillCreater generates an MO bill, and the SMCAPP determines whether SMs to be delivered to the called party are stored in the FDB. If yes, the SMCAPP saves the SM to the FDB. Otherwise, the SMCAPP attempts to deliver the SM.
• MT process
  In the MT process, the SMCAPP attempts to deliver an SM to a mobile subscriber, and the BillCreater generates an MT bill. If the SM fails to be delivered and is pending redelivery, or is successfully delivered but requires a status report, the SMCAPP saves the SM to the FDB. If the SM is deleted after the final delivery attempt fails, or is successfully delivered but requires no status report, the BillCreater generates a charging bill and history bill, and the DBDaemon saves the SM to the history database.