Method of packet transmitting and receiving for supporting internet handover service in wired/wireless converged network internet service

摘要

PURPOSE: A packet transmitting/receiving method for an Internet handover service in a wired/wireless integrated network is provided to assign an IP address and allow a packet transmission/reception while maintaining an existing Internet address system. CONSTITUTION: An origination side adds a header to a TCP(Transmission Control Protocol)/UDP(User Datagram Protocol) payload(S1001). The origination side requests a destination public IP address and destination private IP information from a DNS(Domain Name Server)(S1002), and fetches its own public IP and private IP information from the DNS(S1003). The origination side calculates a checksum of the TCP/UDP header by using the fetched origination public IP and destination public IP address(S1004). The origination side checks whether the origination public IP and the destination public IP are identical(S1005). If they are different, the origination side checks whether there exists an origination private IP address(S1007). If there is no origination private IP, the origination side immediately calculates an IP checksum(S1009) and forwards an IP packet(S1010).