An exterior mirror assembly for a vehicle includes a signal light or security light that provides illumination at a side of the vehicle. The method includes setting, by at least one MTC device belonging to the MTC group, unique transmission latency; waiting, by the MTC device, for the set transmission latency and then receiving information on uplink resources allocated to each MTC group identity from a base station; and transmitting, by the MTC device, uplink data using the allocated uplink resources. 75, thereby obtaining false twisted filaments; and heat-setting the false twisted filaments so as to obtain a permanent antistatic crimped yarn.