There is provided alleviation to erroneous activation and de-activation of secondary cells carrying a physical uplink control channel. User equipment in a mobile communications network is defined serving cells comprising a primary cell and secondary cells. At least one physical uplink control channel is associated with a secondary cell. A secondary cell defined for transmission of the physical uplink control channel is de-activated. A secondary cell is activated, when at least one secondary cell defined for transmission of physical uplink control channel is active.