Prose relay ue activation

A radio base station for participating in activating a relay functionality of a relay user equipment within a mobile communication network, wherein the relay user equipment is capable of performing direct communication over a direct sidelink connection respectively with one or more remote user equipments, wherein the relay user equipment is located in a radio cell controlled by a radio base station in the mobile communication network and supports a relay functionality for being capable of serving as a relay, respectively for the one or more remote user equipments, so as to relay communication between the one or more remote user equipments and the radio base station via the direct sidelink connection, the radio base station comprising:

• a processor that determines whether or not further elays are necessary in the radio cell,
• the processor further selecting a persistence check value within a range of values;
• and
• a transmitter that transmits, to the one or more remote user equipments in the radio cell, relay requirements to be fulfilled before activating the relay functionality,
• the transmitter transmitting a broadcast message in the radio cell in case the processor determines that further relays are necessary, the broadcast message at least indicating that further relays are necessary in the radio cell and comprising the selected persistence check value,
• wherein the broadcast message indicates to the one or more relay user equipments in the radio cell to activate the relay functionality, in case the relay user equipment successfully performs a persistence check based on the persistence check value and in case that the relate user equipment fulfills the relay requirements.