The first network is generally a cellular network covering a larger area than the second network, but the disclosed procedure is also applicable in a scenario where the different cellular networks are only partially overlapping. In the following presentation, the first network is presumed to represent a macro cellular network, i.e., a cellular network in a licensed, unlicensed or partially licensed macro area, e.g., a public land mobile network providing service within an entire country. Several options are foreseen with regard to the spectrum of the first network, e.g. normal nationally licensed, locally licensed as for Citizens Broadband Radio Service Device, CBSD, Priority Access License, PAL, locally registered as CBSD General Authorized Access, GAA, and neither licensed/paid or registered as in 2,4 and 5 GHz bands. Returning to the scenario discussed in relation to FIG. 1, the second network represents a network operated by a different operator than the first network and providing coverage in an area that can best be described as an island, cape or peninsula within the area of the first network. According to an aspect of the disclosure, the first network could be on a CBSD PAL frequency while the second network is on a CBSD GAA frequency. However, the spectrum of the first network may also imply non-overlapping carrier frequencies, which may be in the same band as the spectrum used in the second network. Furthermore, the second spectrum may be locally licensed spectrum or an unlicensed spectrum, e.g., in accordance with MuLTEfire.