Short message service in prose

A core network (CN) node, the CN node in communication with a radio access network (RAN) node, and the RAN node in communication with a wireless transmit/receive unit (WTRU), the CN node comprising:

• a processor, the processor configured, at least, to:
• receive a first short message service (SMS) message from the RAN node, the first SMS message including at least:
• an indication that a recipient WTRU is served by the RAN node, the recipient WTRU identified to the RAN node by the WTRU as a proximity service (PROSE) candidate;
• and
• control protocol data (CP-Data) that includes relay protocol data (RP-Data), the CP-Data that includes the RP-Data forwarded from the WTRU to the RAN node, and
• extract the RP-Data from the CP-Data.

A method for a short message service (SMS) anchor node to deliver an SMS message, the method comprising:

• receiving an indication that a recipient wireless transmit receive unit (WTRU) is in the same general geographical area as a originating WTRU;
• delivering the SMS message to the recipient WTRU without utilizing a SMS Service Center (SC) to route the SMS message;
• de-encapsulating Relay Protocol (RP)-DATA from Control Protocol (CP)-DATA included in a non-access stratum (NAS) message;
• and
• encapsulating the RP-DATA in a CP message for delivery to the recipient WTRU.