ENERGY HARVESTING FROM BACKGROUND RF SIGNAL

A method performed by a first network node for enabling a first wireless device to obtain background RF signal energy from background RF signals provided by the first network node and/or at least one second network node in a wireless communications network on a set of time-frequency resources is presented. The first network node estimates a background RF signal energy available to the first wireless device in each time-frequency resource in the set of time-frequency resources. The first network node determines a first subset of the set of time-frequency resources that the first wireless device is to use for obtaining background RF signal energy based on the estimated background RF signal energy. The first network node transmits information indicating the determined first subset of the time-frequency resources to the first wireless device. A network node a first wireless device and method therein are also provided.