METHOD AND DEVICE FOR THE RELIABLE TRANSMISSION OF COMPRESSED NETWORK HEADERS

• US 20110032917A1
• Filed: 12/04/2008
• Published: 02/10/2011
• Est. Priority Date: 12/07/2007
• Status: Active Grant

• Current Assignee: Thales SA
• Original Assignee: Thales SA
• Inventors: Hammes, Pierre, Lamy-Bergot, Catherine
• Granted Patent: US 8,576,816 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 1/0075 Transmission of coding parameters to receiver H04L1/0023 takes precedence
• CPC Class Codes: H04L 1/0079 Formats for control data H04L1/16 takes precedence; training sequences H04L25/00 and H04L27/00

Abstract

Method for transmitting data in a transmission system, the data being transmitted in the form of packets including a compressed header field and a data field and according to a format suited to the transmission system comprising the following steps: recovering the data packet to be transmitted including a compressed header and useful data, identifying the header part from the useful-data part, applying a corrector coding which is selected at the level of the header, and providing the resulting new packet to the link layer, while also communicating the protection mode used, generating the link header according to the transmission format of the relevant transmission system integrating the mode of protection used, and the adaptation of the CRC checksum of the link layer, on reception, performing the error corrector decoding in two steps.

Claims

1. A method for transmitting data in a transmission system, the data being transmitted in the form of packets comprising at least one compressed header field and one data field and according to a format suited to the transmission comprising the following steps:

recovering the data packet to be transmitted which comprises a compressed header and useful data, and identifying the header part from the useful-data part;

applying a corrector coding which is selected at the level of the header, and providing the resulting new packet to the link layer, while also communicating the protection mode used;

generating the link header according to the transmission format of the relevant transmission system integrating the mode of protection used, and the adaptation of the CRC checksum of the link layer; and

on reception, performing the error corrector decoding in two steps;

A first step of decoding on the start of the RCH compressed header, making it possible to deduce the information regarding the size of the initial compressed header,

A second step of decoding the remainder of the header on the basis of the previously determined size information.

3. The method of claim 1, wherein the transmission of the data uses the IEEE802.11 standard and in that the error corrector coding is introduced on the compressed IP header.

5. The method of claim 1, wherein the data to be transmitted are multimedia data.

6. The method of claim 1, wherein the system is an H.264 video transmission system.

2. A method for transmitting data in a transmission system, the data being transmitted in the form of packets comprising at least one compressed header field and one data field and according to a format suited to the transmission system comprising the following steps:

recovering the data packet to be transmitted which comprises a compressed header and useful data, and identifying the header part from the useful-data part;

applying a corrector coding which is selected at the level of the header, and providing the resulting new packet to the link layer, while also communicating the protection mode used;

introducing the parameters of the error corrector code into the frame at the level of a frame check field whose number of bytes is extended by one or more bytes dedicated to the identification of the code considered for the RCH protection and also to the information regarding the size of the compressed initial header; and

generating the link header according to the transmission format of the relevant transmission system integrating the mode of protection used, and the adaptation of the CRC checksum of the link layer.

4. The method of claim 2, wherein the parameters of the error corrector coding are assumed to be known to the sender and to the receiver and the parameters are provided by a process which is external to the data frame.

7. A system for transmitting data, the data being transmitted in the form of packets comprising at least one compressed header field and one data field, comprising a sender and a decoder receiver wherein said sender comprises a programmed processor with memory containing instructions for causing the processor to execute the following steps:

recovering the data packet to be transmitted which comprises a compressed header and useful data, identifying the header part from the useful-data part,

applying a corrector coding which is selected at the level of the header, and providing the resulting new packet to the link layer, while also communicating the protection mode used,

generating the link header according to the transmission format of the relevant transmission system integrating the mode of protection used, and the adaptation of the CRC checksum of the link layer,

on reception, performing the error corrector decoding in two steps;

A first step of decoding on the start of the RCH compressed header, making it possible to deduce the information regarding the size of the initial compressed header,

A second step of decoding the remainder of the header on the basis of the previously determined size information.

8. A system for transmitting data, the data being transmitted in the form of packets comprising at least one compressed header field and one data field, comprising a sender and a decoder receiver wherein said sender comprises a programmed processor with memory containing instructions for causing the processor to execute for executing the following steps:

recovering the data packet to be transmitted which comprises a compressed header and useful data, and identifying the header part from the useful-data part;

applying a corrector coding which is selected at the level of the header, and providing the resulting new packet to the link layer, while also communicating the protection mode used;

introducing the parameters of the error corrector code into the frame at the level of a frame check field whose number of bytes is extended by one or more bytes dedicated to the identification of the code considered for the RCH protection and also to the information regarding the size of the compressed initial header; and

generating the link header according to the transmission format of the relevant transmission system integrating the mode of protection used, and the adaptation of the CRC checksum of the link layer.

9. The system of claim 8, wherein the transmission of the data uses the IEEE802.11 standard and in that the error corrector coding is introduced on the compressed IP header.

10. The system of claims 8, wherein the parameters of the error corrector coding are assumed to be known to the sender and to the receiver and the parameters are provided by a process which is external to the data frame.

11. The system of claim 8, wherein the data to be transmitted are multimedia data.

12. The system of claim 8, wherein the system is compliant to the H.264 video transmission standard.