Header compression method for network protocols
First Claim
1. A method for compression of header information in network protocols having the following steps:
- transmission of a complete header (FH) during the setting up of a connection, as well as transmitter-end and receiver-end use of this header as a reference, coding by transmitter-end segmentation of each further header into changed fields (c-F;
c1, c2) and unchanged fields (u-P;
u1, u2) with respect to the respectively preceding header, with a cohesive area which has changed symbols and intervals of at most m unchanged symbols being classified as a changed field (c-F) and a cohesive area of at least m+1 unchanged symbols being classified as an unchanged field (u-F), prediction of the positions of these fields (u-F, c-F) from the field of the preceding header, differential transmission of the current header by transmitting a feature (M) for each predicted position, which feature (M) signals whether a position has changed.
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Abstract
The invention relates to an encoding method, which uses statistical characteristics of all types of network protocols without requiring specific knowledge of the definitions of individual protocol fields. Network protocols in general contain long contiguous sections, which remain unchanged. Said sections are therefore predicted from the preceding header and do not need to be transmitted. The position of the modified and unmodified fields is also predicted, so that in most cases, transmission of the position co-ordinates is not necessary. Said principle, together with a corresponding differential encoding, achieves a high data compression, as only the modified data and a small amount of overhead need to be transmitted.
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Citations
15 Claims
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1. A method for compression of header information in network protocols having the following steps:
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transmission of a complete header (FH) during the setting up of a connection, as well as transmitter-end and receiver-end use of this header as a reference, coding by transmitter-end segmentation of each further header into changed fields (c-F;
c1, c2) and unchanged fields (u-P;
u1, u2) with respect to the respectively preceding header, with a cohesive area which has changed symbols and intervals of at most m unchanged symbols being classified as a changed field (c-F) and a cohesive area of at least m+1 unchanged symbols being classified as an unchanged field (u-F),prediction of the positions of these fields (u-F, c-F) from the field of the preceding header, differential transmission of the current header by transmitting a feature (M) for each predicted position, which feature (M) signals whether a position has changed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification