Patent ID: 6999429

Claim:
A method for sending an Internet Protocol (IP)-based data packet across a radio link, said method comprising the steps of: compressing a packet header in the IP-based data packet, where said compressed packet header contains information related to changed values within an IP identification header field, a Real-Time-Transport Protocol (RTP) sequence number field and a RTP time stamp field when compared to values in a packet header associated with a previous IP-based data packet; compressing said compressed packet header again such that said further compressed packet header does not contain any information at all related to the IP identification header field, the RTP sequence number field and the RTP time stamp field, wherein said second compressing step further includes: adjusting an IP identification of said IP identification header field to conform to a stream-sequential identification format if said IP identification conforms to a random format or a host-sequential format; and synchronizing said IP-based data packet to a radio frame based on a time stamp within said RTP time stamp header field and a timing of said radio frame; and transmitting said IP-based data packet that has said further compressed packet header across the radio link.