Patent ID: 8582600
Filing Date: 2013-11-12
Classification: H04L

Abstract:
1. A method for delineating a data stream transmitted by a communication system using a multilayer protocol stack, comprising a receiver, said method comprising: receiving an incoming data stream comprising data packets with protocol header fields, the protocol header fields comprising fields whose content is constant for all the data packets of the incoming data stream; constructing, from the received incoming data stream, by a learning process, at least one sequence (SP), the constructed sequence SP comprising subsets of bits whose content is constant and belong to different protocol header fields of the received incoming data stream; searching for and detecting, in the incoming data stream, sequences similar to the constructed sequence SP, the non-similar sequences not being retained; and determining and storing positions of the similar sequences that have been detected in order to determine information with which to delineate the incoming data stream, wherein subsets of bits of the constructed sequence SP have known relative positions, wherein the storing of the positions of the similar sequences that have been detected comprises saving said positions in a stream of successive similar sequences in order to deduce a start of packets, and wherein, when the data of the incoming data stream are in symbol form, and one of the similar sequences does not begin at a start of a header field and includes an offset relative to the start, the offset corresponding to a number of symbols, the start position of the corresponding packet is estimated by deducing, from the position of said similar sequence, the number of symbols corresponding to this offset.