| CPC H04W 48/18 (2013.01) [H04L 67/02 (2013.01); H04W 4/029 (2018.02); H04W 8/183 (2013.01); H04W 8/186 (2013.01); H04W 68/005 (2013.01)] | 19 Claims |

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1. A method, performed by a first node, the method comprising:
the first node establishing a subscription to event notifications for one or more user equipments (UEs), wherein establishing the subscription to the event notifications comprises sending to a Policy and Control Function (PCF) a request message comprising a request uniform resource identifier (URI) and a request body comprising an event exposure subscription data structure, wherein the event exposure subscription data structure comprises:
(i) an event subscription attribute identifying a policy event,
(ii) a URI attribute specifying a notification URI where to receive the requested notifications,
(iii) a notification identifier (ID) attribute specifying a correlation ID assigned by the first node, and
(iv) event report filter information comprising a set of identifiers, the set of identifiers comprising a first network identifier and/or a first network slice identifier; and
the first node receiving a notification about the event, wherein the notification was transmitted by the PCF and the notification is a message that comprises said notification URI and further comprises an event exposure notification data structure that comprises: (i) the correlation ID and (ii) an event notifications attribute comprising information about the event.
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