Method of operating a base station (108, 208) of a radio access network (104, 204), the method comprising: - receiving at the base station (108, 208) from a user equipment an access request (360, 460) requesting access of said user equipment to said radio access network (104, 204); - providing to a network element (112, 212, 202, 258) an access related request (362, 462) in response to receiving said access request (360, 460) from said UE; - receiving at the base station (108, 208) from the network element (112, 212, 202, 258) a access related response (365, 465) in response to access related request (362, 462), said access related response (365, 465) comprising an access right indication which defines limited access rights of the user equipment to access said radio access network (104, 204) over an air interface via said base station (108, 208), wherein "limited access right" denotes an access right which is between full access rights and no access rights, without reaching both extremes; - granting said user equipment limited access rights to access said radio access network (104, 204) depending on said access right indication; and - providing functionality that enables the user equipment to access network services over the air interface depending on said access right indication; the method further comprising: - receiving from said network element (112, 212, 202, 258) an access related modification request message (381, 393, 394, 497) comprising an update of the access right indication, wherein said update of the access right indication updates the already defined access rights of said user equipment to access said radio access network (104, 204) over an air interface via said base station (108, 208). - receiving at the base station (108, 208) from a user equipment an access request (360, 460) requesting access of said user equipment to said radio access network (104, 204); - providing to a network element (112, 212, 202, 258) an access related request (362, 462) in response to receiving said access request (360, 460) from said UE; - receiving at the base station (108, 208) from the network element (112, 212, 202, 258) a access related response (365, 465) in response to access related request (362, 462), said access related response (365, 465) comprising an access right indication which defines limited access rights of the user equipment to access said radio access network (104, 204) over an air interface via said base station (108, 208), wherein "limited access right" denotes an access right which is between full access rights and no access rights, without reaching both extremes; - granting said user equipment limited access rights to access said radio access network (104, 204) depending on said access right indication; and - providing functionality that enables the user equipment to access network services over the air interface depending on said access right indication; - receiving from said network element (112, 212, 202, 258) an access related modification request message (381, 393, 394, 497) comprising an update of the access right indication, wherein said update of the access right indication updates the already defined access rights of said user equipment to access said radio access network (104, 204) over an air interface via said base station (108, 208).