A method comprising: mounting a base station device, a wireless transmission device and a data transfer device outdoors and on a wall or a pole via one or more mounting members (61, 62, 63); and connecting the data transfer device between the base station device and the wireless transmission device for relaying data, wherein the mounting the base station device includes: mounting a first electronic equipment functioning as a base station to relay data between a plurality of mobile stations and a mobile backhaul network; and mounting a first housing for accommodating the first electronic equipment and providing protection from water and dust ingress necessary for being installed outdoors, wherein the mounting the wireless transmission device includes: mounting a second electronic equipment functioning as a radio station to perform wireless transmission to connect the base station device to the mobile backhaul network; and mounting a second housing for accommodating the second electronic equipment and providing protection from water and dust ingress necessary for being installed outdoor, wherein the mounting the data transfer device includes: mounting a third electronic equipment functioning as a router or a switch to transfer data packets or data frames between the base station device and the wireless transmission device; and mounting a third housing for accommodating the third electronic equipment and providing protection from water and dust ingress necessary for being installed outdoors, and the first, second, and third housings are separate and distinct from one another. mounting a base station device, a wireless transmission device and a data transfer device outdoors and on a wall or a pole via one or more mounting members (61, 62, 63); and connecting the data transfer device between the base station device and the wireless transmission device for relaying data, wherein the mounting the base station device includes: mounting a first electronic equipment functioning as a base station to relay data between a plurality of mobile stations and a mobile backhaul network; and mounting a first housing for accommodating the first electronic equipment and providing protection from water and dust ingress necessary for being installed outdoors, mounting a first electronic equipment functioning as a base station to relay data between a plurality of mobile stations and a mobile backhaul network; and mounting a first housing for accommodating the first electronic equipment and providing protection from water and dust ingress necessary for being installed outdoors, wherein the mounting the wireless transmission device includes: mounting a second electronic equipment functioning as a radio station to perform wireless transmission to connect the base station device to the mobile backhaul network; and mounting a second housing for accommodating the second electronic equipment and providing protection from water and dust ingress necessary for being installed outdoor, mounting a second electronic equipment functioning as a radio station to perform wireless transmission to connect the base station device to the mobile backhaul network; and mounting a second housing for accommodating the second electronic equipment and providing protection from water and dust ingress necessary for being installed outdoor, wherein the mounting the data transfer device includes: mounting a third electronic equipment functioning as a router or a switch to transfer data packets or data frames between the base station device and the wireless transmission device; and mounting a third housing for accommodating the third electronic equipment and providing protection from water and dust ingress necessary for being installed outdoors, and mounting a third electronic equipment functioning as a router or a switch to transfer data packets or data frames between the base station device and the wireless transmission device; and mounting a third housing for accommodating the third electronic equipment and providing protection from water and dust ingress necessary for being installed outdoors, and the first, second, and third housings are separate and distinct from one another.