Patent Document ID: 9894540
Application ID: 14977327
Patent Flag: 1

Claim One:
1. A method of self-optimisation for a base station within a cellular radio network, the base station having a first communication interface for providing a service to mobile terminals and a second communication interface for communication with other network entities of the cellular radio network, the method comprising: detecting, at a first time, a degradation in performance of the service provided over the first communication interface; identifying a reliability level for the second communication interface at the time of degradation in performance of the service provided over the first communication interface, wherein if the second communication interface has failed then identifying a report of a failure, at a second time, of the second communication interface; and implementing a network optimization procedure using a Self-Organising Network, SON, algorithm in dependence on the identified reliability level and in response to the detection of degradation, wherein the SON algorithm omits making changes to radio parameters upon determining that the degradation in performance is due to a physical failure of the second communication interface, and wherein the SON algorithm uses as input an indication of whether the failure of the second communication interface was the cause of the failure of the first communication interface based on a determined time interval between the first time and the second time.