Method and system for controlling effective time of terminal trigger message

A system for controlling effective time of a terminal trigger message, comprising:

• a receiving unit, a determining unit and a configuring unit;
• wherein
• the receiving unit is configured to receive a terminal trigger message from a Machine Type Communication (MTC) application server;
• wherein the terminal trigger message comprises an effective time value of the terminal trigger message;
• the determining unit is configured to, in a scenario of congestion control, determine whether a time value of a back-off timer is longer than the effective time value of the terminal trigger message which is received by the receiving unit;
• wherein when the mobility management unit rejects an Non-Access Stratum (NAS) request message initiated by a terminal which is under the congestion control, the back-off timer is carried in a rejection message such that the terminal cannot initiate any request until the back-off timer expires;
• and
• the configuring unit is configured to, when the determining unit determines that the time value of the back-off timer is longer than the effective time value of the terminal trigger message, reconfigure the effective time value for the terminal trigger message;
• the configuring unit is further configured to reconfigure the effective time value for the terminal trigger message such that the reconfigured effective time value of the trigger message is not less than the time value of the back-off timer;
• wherein the receiving unit, the determining unit and the configuring unit are each the result of execution on a processor of software stored in a memory.