Distributor function, locator function and methods in a communications network

A method performed by a locator function for handling a subscription to expose Internet protocol Multimedia Subsystem, IMS, exposure data in a wireless communications network (100), which exposure data is related to a User Equipment, UE, (121) connected to an IMS network (102) comprised in the wireless communications network (100), wherein the locator function is comprised in any one out of:

• a first IMS node (131) or a third network node (113), the method comprising:
• receiving (1101), from a second IMS node (132), mapping information related to a registration of the UE (121) in the second IMS node (132),
• upon request from a distributor function, which distributor function is comprised in any one out of:
• a first network node (111) or the first IMS node (131), locating (1102) data identifying the second IMS node (132) serving the UE (121) based on the mapping information, and
• providing (1103), to the distributor function, the data identifying the second IMS node (132) serving the UE (121),
• wherein the data identifying the second IMS node (132) enables the distributor function to send a subscription request, to the second IMS node (132), to expose data related to the UE (121), which subscription request instructs the second IMS node (132) to notify a network exposure function of a triggering occurrence fulfilling a triggering condition, to expose exposure data, when detected by the second IMS node (132), which network exposure function is located in the first network node (111).

A distributor function configured to handle a subscription to expose Internet protocol Multimedia Subsystem, IMS, exposure data in a communications network (100), which exposure data is adapted to be related to a User Equipment, UE, (121) connected to an IMS network (102) adapted to be comprised in the communications network (100), wherein the distributor function is adapted to be comprised in any one out of:

• a first network node (111) or a first IMS node (131), the distributor function further being configured to:
• receive a request adapted to request a subscription to expose IMS exposure data adapted to be related to the UE (121), which request is adapted to originate from a second network node (112) adapted to operate outside of the IMS network (102),
• obtain, from a locator function, data adapted to identify a second IMS node (132) adapted to support exposure capabilities and serving the UE (121), which locator function is adapted to be comprised in any one out of:
• the first IMS node (131) or a third network node (113), and
• send to the identified second IMS node (132), a subscription request to expose data related to the UE (121), which subscription request is adapted to instruct the second IMS node (132) to notify a network exposure function of a triggering occurrence fulfilling a triggering condition, to expose exposure data, when detected by the second IMS node (132), which network exposure function is adapted to be located in the first network node (111),
• wherein the notification is adapted to enable the network exposure function to notify the second network node (112) of the detected triggering occurrence.