A data slot allocation method allowing a plurality of devices in a wireless personal area network to satisfy the required QoS condition for the data stream transmission. A related method is also provided. The linkage arm includes a drive link which is rotated by the actuator motor and a guide link spaced apart from the drive link. The ground warp yarn and the ground weft yarn include monofilament yarns, and the additional warp yarn includes a material different from a material forming the ground warp yarn.