Methods and nodes for UE-to-UE event monitoring

A network exposure node comprising:

• a transceiver, a processor and a memory, the memory comprising instructions executable by the processor whereby the processor is operative to:
• receive a reference identity for the network exposure node in a first monitoring message from a first network node;
• receive monitoring indication from at least one of a source mobile management entity, MME, a source serving general packet radio service support node, SGSN, and a home subscriber server, HSS, the at least one of the MME, SGSN, and HSS containing the reference identity;
• retrieve, based on the reference identity for the network exposure node, an identity list of one or more subscriber user equipment, UEs, which have subscribed to monitoring of an event, and configuration information for the one or more subscriber UEs, which are stored by the network exposure node;
• retrieve non-Internet Protocol data delivery, NIDD, configuration information based on the reference identity;
• determine, based on the identity list and the configuration information, a second network node associated with a subscriber UE in the identity list;
• and
• transmit a report for the monitoring of the event in a second monitoring message to the determined second network node;
• determine at least one of an MME and SGSN associated with the subscriber UE in the identity list;
• and
• transmit a mobile terminated NIDD submit request to the determined at least one of the MME and the SGSN enabling the subscriber UE to transmit the reporting of monitoring event to one or more subscriber UEs without a service capability server/application server, SCS/AS.