Method and system for sending short message

A system for sending a short message, comprising:

• a short messaging service-service centre (SMS-SC), a short messaging service-gateway mobile switching centre (SMS-GMSC) for sending a short message, a mobile management entity (MME) and a home subscriber server, wherein the MME comprises a hardware processor configured to execute program modules stored on a memory, the program modules comprising:
• a first sending module configured to send a failure report to the SMS-GMSC when the detection module detects that the terminal is unreachable, wherein the terminal is determined to be unreachable when the terminal is in one of the following statuses:
• the terminal failing to respond to paging of the MME within a preset time;
• and a status of the terminal being a de-attachment status;
• when the terminal is determined to be unreachable, the MME sets a first waiting indication locally, the first waiting indication being indicating that the terminal is unreachable in a Evolved Packet System (EPS) network;
• a first notification module configured to send a warning message to notify the home subscriber server that the terminal is reachable when the detection module detects that the terminal switches from unreachable to reachable;
• the SMS-GMSC comprises a hardware processor configured to execute program modules stored on a memory, the program modules comprising:
• a first receiving module configured to receive the failure report sent from the MME;
• a second sending module configured to send a short-message sending status message to the home subscriber server, wherein the home subscriber server sets waiting data according to the short-message sending status message;
• the home subscriber server comprises a hardware processor configured to execute program modules stored on a memory, the program modules comprising:
• a second receiving module configured to receive the short-message sending status message from the SMS-GMSC;
• a second notification module configured to, upon learning that the terminal is reachable, according to the waiting data, notify the SMS-SC that the terminal is reachable, wherein upon learning that the terminal is reachable again, the SMS-SC sends the short message again.