A positive electrode active material for a lithium ion secondary battery having high discharge energy and capable of suppressing capacity drop with cycles and a secondary battery using the same are provided at lower cost. The method includes receiving an incoming voice telephone call from a call network at a multi-party module, and allowing, by the multi-party module, for a plurality of terminal modules to participate in the incoming voice telephone call, each terminal module comprising a telephone. The conductive wire layer structure has a plurality of trapezium conductive wiring regions and a plurality of inverse trapezium conductive wiring regions alternately arranged in the bonding pad area. The nanotube base layer separates emitter and collector layers of semiconductor material. In this manner, transmission performance is improved. The coded OFDM signal comprises systematic bits, error control bits, and a cyclic prefix.