Eads Secure Networks

Cassidian Sas

Cassidian Finland Oy

Airbus Ds Sas

Marc Mouffron

Philippe Mege

Christophe Molko

Christophe Brutel

Julien Prat

Jean-Michel Tenkes

Simo Rinne

Lari-Mikko Kauhanen

This transmission comprising a first transmission of a packet (), comprising the steps consisting in: a first processing () of said packet () to obtain a first packet (); and a coding () of the first packet (); wherein, when the first coded packet is received erroneous, the method comprises a second transmission of said packet, comprising: the steps implemented in the transmitter, consisting in: a second processing () of said packet () to obtain a second packet (); and a coding () of the second packet (); and the steps implemented in the receiver, consisting in: a modification of the first and/or the second coded packets to obtain two packets in which the difference due to the first and second processings is compensated for: a combination () of both packets according to a HARQ procedure; and a decoding () of the combined packet.

Data packet transmission method

The invention related to a method for encoding information using non-linear evenly distributed functions, that comprises the following steps for building such a function: selecting a first natural integer n, a first set En of cardinal n, a group G operating on said first set En, a second natural integer q and a second set Eq of cardinal q; defining a set OG of the orbits of the group G operating on vectors of n elements in the set Eq, a function II that, for each vector of the n elements of the set Eq, associates the corresponding orbit and a second function &#x3a6; allocating to each orbit of the group G a value of the set Eq; evenly distributing into a number q of sections the sums of the cardinals of the orbits of the group; defining a third function F comprising the first and second functions &#x3a6;oII.

Method for encoding information using non linear evenly distributed functions and computer software for implementing said method

For the transmission of information with verification of transmission errors, a useful information message (M) is transmitted in a determined frame while being associated with a determined number p of transmission error verification bits (CRC,S) also transmitted in the frame. In order to have an element allowing the verification of intentional errors, determined number p1 of the transmission error verification bits form a seal (S) obtained from a determined sealing function, where p1 is a number less than p. Application to radiocommunications equipment requiring the verification of the integrity and the authentication of the messages transmitted.

Method and device for transmitting information with verification of unintentional and intentional transmission errors

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Saint Remy les Chevreuses, France

Marc Mouffron