An apparatus including: at least one processor, and at least one memory for storing instructions to be executed by the processor, wherein the at least one memory and the instructions are configured to, with the at least one processor, cause the apparatus to at least: request for using a part of a spectrum of a second communication network on the basis of a spectrum cooperation relationship between a first communication network and the second communication network, provide a service coordination information related to the request for using a part of the spectrum, the service coordination information indicating measures based on roaming mechanism offered by the first communication network allowing the second communication network to obtain compensation in the form of communication resources or traffic for using a part of the spectrum of the second communication network by the first communication network, and receive and process a response to the request for using a part of the spectrum of the second communication network and a service coordination response informing about accepted measures of those being offered in the service coordination information.