Patent ID: 9055099
Filing Date: 2015-06-09
Classification: H04L,H04W,Y02D

Abstract:
1. A method of preventing a Denial of Service (DoS) attack by checking flow of packets transmitted between a base station and a mobile station using a Transmission Control Protocol (TCP) protocol, the method comprising the steps of: transmitting, at the mobile station, a connection request acknowledgement SYN/ACK transmitting, at the base station, an acknowledgement ACK establishing the TCP connection when the mobile station receives the transmitted acknowledgement ACK determining that the established TCP connection is abnormal and terminating the established TCP connection if the mobile station receives a packet, in which a reset RST or connection request SYN flag is set, transmitted from the base station, wherein when the TCP connection is established, and then the mobile station cannot receive any packet during a previously set timeout period, the base station is determined to have abnormally terminated the TCP connection, and the mobile station safely terminates the TCP connection.