The present invention provides an optical fiber preform-heating furnace that is simple in its structure and excellent in uniformity of the temperature distribution in a circumferential direction of an optical fiber preform. A user equipment receives a plurality of downlink resource allocations on a plurality of downlink control channels by using a plurality of downlink carriers, and receives a plurality of downlink transfer blocks on a plurality of downlink shared channels indicated by the plurality of downlink resource allocations. Steps to and step can also be carried out in reverse order. The fluorescent layer faces to the first major surface of the semiconductor layer and includes a plurality of kinds of fluorescent materials having different peak wavelengths of emission light. By providing such a general structure for use in a file system of a computer, a substantially larger amount of memory is available for looped recording.