Patent ID: 7730380

Claim:
A method of transmitting a voice over Internet protocol (VoIP) packet on a radio link in a mobile communication system which provides a voice service over a packet network connected to the Internet, comprising the steps of: receiving, from an upper layer, a VoIP packet containing a user datagram protocol (UDP) checksum field, a UDP checksum in the UDP checksum field being determined based on the VoIP packet; replacing the UDP checksum in the UPD checksum field with a pseudo checksum, the replaced pseudo checksum being preset between a transmitter and a receiver; compressing the header of the VoIP packet except for the replaced pseudo checksum in the UDP checksum field; eliminating the UDP checksum field from the header-compressed VoIP packet; and adding a cyclic redundancy check (CRC) to the UDP checksum field-free VoIP packet, for error detection in the radio link.