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1. WO2007031090 - A METHOD OF COMPRESSING THE HEADER OF A DATA PACKET

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

Claims

1. A method of compressing the header of a data packet for transmission in a communication system, said data packet comprising a data part having a payload size and a header part, characterised in that the header part of the data packets is adaptively compressed using a header compression mechanism based on the payload size of the data part.

2. A method according to claim 1 , wherein a header compression mechanism is switched on or off based on the payload size of the data part.

3. A method according to claim 1 or 2, wherein the communication system uses fixed link layer packet types.

4. A method according to any of the preceding claims, wherein the data packets are sent in blocks of a fixed size, the number of blocks used depending on the size of the data packets.

5. A method according to any of the preceding claims, wherein the header compres-sion is switched off if the packet type of a data packet with header compression is the same as the packet type of a data packet without header compression, and is switched on if the packet type of a data packet with header compression is different from the packet type of a data packet without header compression.

6. A method according to claim 3 or claim 3 and any of claims 4-5, wherein the header compression is switched off if the number of blocks used for sending a data packet with header compression is the same as the number of blocks used for a data packet without header compression, and is switched on if the number of blocks used for sending a data packet with header compression is different from the number of blocks used for a data packet without header compression.

7. A method according to any of the preceding claims, wherein the header compression mechanism compresses the header by removing redundancy from the header of the data packet using information from priorly sent data packets.

8. A method according to claim 7, wherein the header compression mechanism compresses the header, so that the header of a data packet only carries differential information compared to a preceding header.

9. A method according to any of the preceding claims, wherein the header compression is tuned in such a way that only a subset of available packet types are used.

10. A communication system using a header compression method according to any of claims 1-9.

11. A communication system according to claim 10, wherein the system comprises a transmitter side and a receiver side, a communication channel being generated between the transmitter side and the receiver side, and wherein the transmitter side comprises a header compression mechanism, and the receiver side comprises a header decompression mechanism.

12. A header compression mechanism for compressing the header of a data packet comprising a header part and a data part, said data part having a payload size, characterised in that the header mechanism is switched on or off based on the payload size of the data part of the data packet.