A technique for evaluating a semiconductor chip is provided. 013 with respect to a refraction index of the first member. The cyclone body is formed in a convex cylinder shape, so that a diameter thereof in the vicinity of an entrance of the air discharging part through which the air is discharged comes maximum. The method includes receiving a subframe from a sequence of subframes transmitted by the neighboring cell node in the neighboring cell, and determining that the received subframe is a multicast subframe based on the subframe sequence pattern.