To meet a demand of convenient mobile computing, we studied an error control scheme mounted on conventional radio packet system. Two error control schemes for Transmission Control Protocol (TCP) connection on a wireless network are proposed that can minimize the degradation in radio link throughput due to TCP retransmission. One scheme is based on the discard of TCP retransmission packets, and the other is based on the suppression of transmission delay fluctuation on the radio link. These schemes can be mounted without changing the existing TCP scheme. Simulation results show that the degradation in throughput is reduced by 11% by using either scheme when the frame error rate is 10e-2 under Indoor-B condition and pedestrian condition that are defined as standard simulation condition for IMT-2000 .