A system and method for synchronous spectrum sharing for a dedicated network in a wireless communication system based on orthogonal frequency-division multiplexing or orthogonal frequency division multiple access signaling is disclosed. The present invention comprises various embodiments for making a hair weave tract extension apparatus and a method of making and using said apparatus. An outer groove wall surface of the circumferential groove includes a gentle decline wall in the tread surface side, and a steep decline wall in the groove bottom side. At least one air injection passage is arranged in the groove.