A method performed by a time synchronization entity, TSE, e.g. a Time Sensitive Communication and Time Synchronization Function, TSCTSF, the method comprising: receiving a first request (252b, 254), e.g. Ntsctsf_TimeSynchronization_ConfigCreate Request, comprising i) an identifier, ID, associated with at least a first user equipment, UE, e.g. the ID is associated only with the first UE, the ID is associated with a group of UEs that includes the first UE, or the ID identifies any UE, and ii) coverage area, CA, information specifying a CA; and in response to receiving the create service request, a) invoking a subscription service to receive a notification, e.g. directly from an AMF or from an AMF via another network node such as an UDM or an SMF, whenever the first UE moves into or moves out of an area of interest, Aol; where the method further comprises: i) receiving a notification that the first UE has entered the Aol; ii) after receiving the notification, determining whether the first UE has entered the CA from an area not covered by the CA; and ii) in response to determining that the first UE has entered the CA from an area not covered by the CA, activating a time synchronization, TS, service for the UE, or b) sending to a policy control function, PCF, a second request (426, 526) comprising the CA information, wherein the second requests is configured to cause the PCF to invoke the subscription service to receive a notification whenever the first UE moves into or moves out of an Aol, wherein the Aol is identical to the CA or the Aol is a subset of the CA. receiving a first request (252b, 254), e.g. Ntsctsf_TimeSynchronization_ConfigCreate Request, comprising i) an identifier, ID, associated with at least a first user equipment, UE, e.g. the ID is associated only with the first UE, the ID is associated with a group of UEs that includes the first UE, or the ID identifies any UE, and ii) coverage area, CA, information specifying a CA; and in response to receiving the create service request, a) invoking a subscription service to receive a notification, e.g. directly from an AMF or from an AMF via another network node such as an UDM or an SMF, whenever the first UE moves into or moves out of an area of interest, Aol; where the method further comprises: i) receiving a notification that the first UE has entered the Aol; ii) after receiving the notification, determining whether the first UE has entered the CA from an area not covered by the CA; and ii) in response to determining that the first UE has entered the CA from an area not covered by the CA, activating a time synchronization, TS, service for the UE, or b) sending to a policy control function, PCF, a second request (426, 526) comprising the CA information, wherein the second requests is configured to cause the PCF to invoke the subscription service to receive a notification whenever the first UE moves into or moves out of an Aol, wherein the Aol is identical to the CA or the Aol is a subset of the CA. a) invoking a subscription service to receive a notification, e.g. directly from an AMF or from an AMF via another network node such as an UDM or an SMF, whenever the first UE moves into or moves out of an area of interest, Aol; where the method further comprises: i) receiving a notification that the first UE has entered the Aol; ii) after receiving the notification, determining whether the first UE has entered the CA from an area not covered by the CA; and ii) in response to determining that the first UE has entered the CA from an area not covered by the CA, activating a time synchronization, TS, service for the UE, or i) receiving a notification that the first UE has entered the Aol; ii) after receiving the notification, determining whether the first UE has entered the CA from an area not covered by the CA; and ii) in response to determining that the first UE has entered the CA from an area not covered by the CA, activating a time synchronization, TS, service for the UE, or b) sending to a policy control function, PCF, a second request (426, 526) comprising the CA information, wherein the second requests is configured to cause the PCF to invoke the subscription service to receive a notification whenever the first UE moves into or moves out of an Aol, wherein the Aol is identical to the CA or the Aol is a subset of the CA.