A NETWORK NODE AND A METHOD THEREIN AND A RADIO BASE STATION AND A METHOD THEREIN FOR PROTECTING CONTROL CHANNELS OF A NEIGHBOURING RADIO BASE STATION

摘要

A network node and a method performed by a network node for protecting control channels of a neighbouring RBS the network node and the RBS being operable in an OFDM based radio communication network are provided. An RBS and a method performed by an RBS for transmitting control channels to UEs currently being associated with the RBS in an OFDM based radio communication network are also provided. The method in the network node comprises determining (220) at least one subframe out of a predetermined number of subframes in which control channels are to be transmitted with reduced transmission power in relation to a nominal transmission power; and informing (230) the RBS which subframe(s) out of the predetermined number of subframes in which control channels are to be transmitted with reduced transmission power.