Replacement of transport-layer checksum in checksum-based header compression

• US 6,609,224 B1
• Filed: 09/07/2000
• Issued: 08/19/2003
• Est. Priority Date: 02/04/2000
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Jonsson, Lars-Erik
• Primary Examiner(s): Moise, Emmanuel L.
• Assistant Examiner(s): Whittington, Anthony T.
• Application Number:
  US09/657,350
• Time in Patent Office: 1,076 Days
• Field of Search: 714/776, 714/758, 714/807
• US Class Current: 714/758
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/0083 Formatting with frames or packets; Protocol or part of protocol for error control

Abstract

A method and apparatus for replacing a transport layer header error detection code and a header compression algorithm error detection code with a one error detection code. The replacement error detection code covers both the transport layer header and the transport layer payload. Such an arrangement reduces the amount of as-is or uncompressed information transmitted, thereby reducing the required bandwidth. The replacement error detection code is subsequently used to verify the correctness of both the reconstructed header and the payload.

Claims

1. A method for replacing a transport layer error detection code in a header compression algorithm, the method comprising the steps of:

calculating one error detection code covering both a transport layer header and a transport layer payload;

compressing said transport layer header in accordance with said header compression algorithm;

including said error detection code with said compressed transport layer header; and

transmitting said compressed transport layer header.

2. The method according to claim 1, further comprising reconstructing said transport layer header and verifying said reconstructed transport layer header using said error detection code.

3. The method according to claim 1, wherein said error detection code is a CRC.

4. The method according to claim 1, wherein said error detection code has a size of about 2 octets.

5. The method according to claim 1, wherein said transport layer is an IP-based transport layer.

6. The method according to claim 5, wherein said IP-based transport layer includes a transport layer checksum in said transport layer header, and said error detection code is calculated to cover said checksum.

7. A system for replacing a transport layer checksum in a header compression algorithm, said system comprising:

an error detection code calculator for calculating one error detection code covering both a transport layer header and a transport layer payload;

a header compressor for compressing said transport layer header in accordance with said header compression algorithm; and

a transmitter for transmitting said compressed transport layer header.

8. The system according to claim 7, further comprising a header decompressor for reconstructing said transport layer header.

9. The system according to claim 7, further comprising a verification processor for verifying said reconstructed transport layer header using said error detection code.

10. The system according to claim 7, wherein said error detection code is a CRC.

11. The system according to claim 7, wherein said error detection code has a size of about 2 octets.

12. The system according to claim 7, wherein said transport layer is an IP-based transport layer.

13. The system according to claim 12, wherein said IP-based transport layer includes a transport layer checksum in said transport layer header, and said error detection code is calculated to cover said checksum.