A radio terminal (1) is configured to, in response to receiving a request from a network (100) when the radio terminal (1) can connect to the network (100), perform sidelink communication (102) with a second radio terminal (2), which is in a state of being unable to connect to the network (100), in accordance with a pre-configured first radio parameter (1008). The sidelink communication (102) includes at least one of direct discovery and direct communication. It is thus, for example, possible to contribute to improvement of sidelink communication in partial coverage.