Abstract: A method performed by a first network node (110) for determining whether a performance of a cell (130) associated with a second network node (120) is degraded or not. The first network node (110) and the second network node (120) operate in a wireless communications network (100). The first network node (110) obtains (201) a first set of values making up a pattern comprising a set of values indicative of a performance of the cell (130). The first network node (110) then determines (204) a first correlation between the obtained first set of values and a generated set of values. The generated set of values is indicative of a degraded performance of the cell (130). The first network node (110) then determines (206) whether the performance of the cell (130) is degraded or not based on the determined first correlation, with respect to a first threshold.

Abstract: An apparatus and corresponding method for determining a cause of a fault in a network. The apparatus comprises a means for receiving, which may be a receiver, configured to receive a plurality of time separated samples of a primary network metric that are indicative of a fault in the network, and a plurality of time separated samples of one or more indicator network metrics. The apparatus comprises a means for correlating, which may be a correlator, configured to determine one or more metric correlation values relating to dependences between the samples of the primary network metric and the samples of each of the one or more indicator network metrics. The correlator is further configured to determine one or more fault correlation values relating to dependences between the one or more metric correlation values and a plurality of stored metric correlation values associated with a fault cause.

Abstract: A method performed by a first network node for detecting outage of a radio cell served by a second network node. The first network node and the second network node operate in a wireless communications system. The first network node determines a number of incoming handovers for the radio cell of the second network node in a first measurement period. The first network node then determines whether the radio cell is in outage, based on whether the determined number of incoming handovers in the first measurement period is under or equal to a threshold.

Abstract: A method performed by a first network node for detecting outage of a radio cell served by a second network node. The first network node and the second network node operate in a wireless communications system. The first network node determines a number of incoming handovers for the radio cell of the second network node in a first measurement period. The first network node then determines whether the radio cell is in outage, based on whether the determined number of incoming handovers in the first measurement period is under or equal to a threshold.

Abstract: A method performed by a first network node (110) for determining whether a performance of a cell (130) associated with a second network node (120) is degraded or not. The first network node (110) and the second network node (120) operate in a wireless communications network (100). The first network node (110) obtains(201) a first set of values making up a pattern comprising a set of values indicative of a performance of the cell (130). The first network node (110) then determines(204) a first correlation between the obtained first set of values and a generated set of values. The generated set of values is indicative of a degraded performance of the cell (130). The first network node (110) then determines (206) whether the performance of the cell (130) is degraded or not based on the determined first correlation, with respect to a first threshold.

Abstract: An apparatus and corresponding method for determining a cause of a fault in a network. The apparatus comprises a means for receiving, which may be a receiver, configured to receive a plurality of time separated samples of a primary network metric that are indicative of a fault in the network, and a plurality of time separated samples of one or more indicator network metrics. The apparatus comprises a means for correlating, which may be a correlator, configured to determine one or more metric correlation values relating to dependences between the samples of the primary network metric and the samples of each of the one or more indicator network metrics. The correlator is further configured to determine one or more fault correlation values relating to dependences between the one or more metric correlation values and a plurality of stored metric correlation values associated with a fault cause.