Enhancement of MT SM delivery for eDRX enabled mobile terminals

A method of a mobility management node of enabling delivery of a Mobile Terminating, MT, Short Message, SM, to a mobile terminal;

• comprising:
• receiving a notification that the mobile terminal has exited an extended idle mode discontinuous reception, eDRX, mode before a paging occasion has occurred;
• submitting a context request to another mobility management node by which the mobile terminal was served before the notification was received;
• receiving, from said another mobility management node, a context response comprising an indication that the SM is to be delivered;
• and
• receiving, from the SMS-GMSC, the SM for delivery to the mobile terminal.

A mobility management node configured to enable delivery of a Mobile Terminating, MT, Short Message, SM, to a mobile terminal, and which mobility management node comprises a processing unit and a memory, said memory containing instructions executable by said processing unit, whereby said mobility management node is operative to:

• receive an indication from a Short Message Service Gateway Mobile Switching Centre, SMS-GMSC, that the SM is to be delivered to the mobile terminal, which is currently in extended idle mode discontinuous reception, eDRX, mode;
• receive a notification that the mobile terminal has exited the eDRX mode before a paging occasion has occurred;
• and
• submit, in response to the notification, a message indicating to the SMS-GMSC that the mobile terminal is available for delivery of the SM.