A computer-implemented method includes identifying a current packet data transmission credit value assigned to a packet data transmitter. The method includes identifying a value change in the current packet data transmission credit value. The baseline packet transmission credit value is for the packet data transmitter. The method is responsive to the change being a decrease by increasing a transmission opportunity weight for the packet data transmitter. The method is responsive to the change being an increase by decreasing the transmission opportunity weight for the packet data transmitter. The method includes passing to the packet data transmitter a parameter. The parameter directing the packet data transmitter to transmit packet data via data transmission circuitry during a scheduled transmission opportunity. The extent of the parameter is proportional to the transmission opportunity weight.