Server and method for short message service in private wireless network interworking with public land mobile network

A server apparatus, comprising:

• a first short message service server providing short message service through a private wireless network system to a mobile unit, the mobile unit subscribed in botha public land mobile network system and the private wireless network system, said first server comprising:
• a short message service control module transmitting a first short message service message received through an Internet protocol network system to a private mobile switching center of the private wireless network system in dependence upon a first short message service request, said short message service control module designating a message type of the first short message service message as a public message type when at least one failure response is received by said short message service control module, the at least one failure response indicating that the first short message service message failed to be delivered through the private wireless network system to the mobile unit, said short message service control module storing the first short message service message designated as the public message type in a short message service control message queue;
• and
• a public daemon searching the queue, and, when the searching results in a determination that the queue contains the first short message service message designated as the public message type, said public daemon requesting short message service from a second short message service server of the public land mobile network system through the Internet protocol network system to send the first short message service message designated as the public message type to the mobile unit through the public land mobile network system.

A method, comprising:

• receiving a first request at a first server in a private wireless network system, the first request passing through an Internet protocol network system;
• transmitting a first message from the first server to a switching center in the private wireless network system, said transmitting being performed in dependence upon said receiving of the first request, the first message having a destination corresponding to a mobile unit;
• and
• conveying a second request to a second server of a public land mobile network system through the Internet protocol network system when at least one failure response is received, the at least one failure response indicating that the first message failed to be delivered through the private wireless network system to the mobile unit, the second request being a request to deliver the first message to the mobile unit through the public land mobile network system.