Patent ID: 8654642

Claim:
A wireless packet transmission apparatus comprising: a wireless transmitter; a packet priority controller that controls an order of transmitting packets with different priorities, and an adaptive modulation controller that changes a modulation scheme of the packets according to a status of a wireless line, said packet priority controller comprising: a schedule selector that, when a modulation scheme is changed by said adaptive modulation controller, with respect to packets with a priority of a predetermined value or more among the packets, provisionally sets a strict priority control scheme, which indicates that the packets with a priority of a predetermined value or more are transmitted with priority over other packets, as a control scheme that determines an order of transmitting the packets with a priority of a predetermined value or more, and a comparison section that compares a strict priority rate that is a transmission rate of packets for which the strict priority control scheme is provisionally set by said schedule selector and a wireless transmission rate that is a transmission rate of said wireless packet transmission apparatus that is determined by a modulation scheme that is changed by said adaptive modulation controller; wherein, based on a comparison result obtained by said comparison section, said schedule selector determines whether to set the strict priority control scheme as the control scheme for the packets for which the strict priority control scheme is provisionally set, and wherein when the wireless transmission rate is higher than the strict priority rate, said schedule selector sets the strict priority control scheme as the control scheme for the packets for which the strict priority control scheme is provisionally set.