Patent ID: 7656874

Claim:
A method of controlling a sending peer of a data unit transmission protocol, said sending peer dividing a continuous data symbol stream into data units of at least a first format and a second format and sending said data symbol stream in the form of said data units of said first format or said second format to a receiving peer, comprising: maintaining a first record of said data symbol stream in terms of one or more first sequences of data units of said first format, simultaneously maintaining a second record of said data symbol stream in terms of one or more second sequences of data units of said second format, where said first record and said second record have a common reference point to said data symbol stream, dynamically switching between a first transmission mode for sending data units of said first format and a second transmission mode for sending data units of said second format, where each sent data unit of said first format comprises a sequence position indicator that indicates a position in one of said first sequences and each sent data unit of said second format comprises a sequence position indicator that indicates a position in one of said second sequences, where after switching from said first transmission mode to said second transmission mode, the transmission continues with a given data unit of one of said second sequences comprising a position indicator such that said given data unit comprises a data symbol immediately following a last data symbol of said data symbol stream that was sent in the data unit of said first format last sent before said switching, and after switching from said second transmission mode to said first transmission mode, the transmission continues with a given data unit of one of said first sequences comprising a position indicator such that said given data unit comprises a data symbol immediately following the last data symbol of said data symbol stream that was sent in the data unit of said second format last sent before said switching.