A method for assisting with the transmission of TCP packets, which is used in a wireless communication system, including: receiving a plurality of TCP packets from a TCP packet sender and transmitting the TCP packets to a receiver proxy; transmitting a feedback packet to a sender proxy when receiving a TCP packet; calculating a round trip time (RTT) between the sender proxy and the receiver proxy when receiving the feedback packet, and comparing a RTT threshold and the RTT between the sender proxy and receiver proxy; determining whether a network between the sender proxy and the receiver proxy is in a congestion state according to the result of the comparison between the RTT threshold and the RTT; and dropping a TCP packet when the network is in the congestion state.