Method of protecting the data transmission in a data bus

• US 20040015603A1
• Filed: 04/24/2002
• Published: 01/22/2004
• Est. Priority Date: 10/25/1999
• Status: Abandoned Application

• Current Assignee: Bayerische Motoren Werke AG
• Original Assignee: Bayerische Motoren Werke AG
• Inventors: Peller, Martin, Griessbach, Robert
• Application Number:
  US10/128,547
• Publication Number:
  US 20040015603A1
• Time in Patent Office: Days
• US Class Current: 709/236
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/0078 Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location forward error control, e.g. FEC, CRC H04L1/004; adaptive formatting H04L1/0006; mappings H04L27/00
• CPC Class Codes: H04L 2001/0094 Bus

Abstract

The invention relates to a method for securing data transfer in a data bus via which data telegrams of at least one transmitter are transferred containing a data field of a variable length and a check sum and the data transfer quality is determined by the receiver using the check sum, said check having a shorter length when the data field length is shorter than when the data field is longer.

Claims

1. A method for securing data transfer in a data bus via which data telegrams of at least one transmitter are transferred containing a data field having a variable length and a check sum, a data transfer quality being determined by a receiver using the check sum, the method comprising the acts of:

obtaining an indication of a data field length of a data telegram; and

providing a shorter check sum length when it is indicated the data field length is shorted than when the data field length is longer.

2. The method according to claim 1, wherein the check sum has two possible lengths.

3. The method according to claim 1, wherein the check sum length is determined by the transmitter using the data field length.

4. The method according to claim 2, wherein the check sum length is determined by the transmitter using the data field length.

5. The method according to claim 1, wherein the check sum length is determined by the transmitter using information on the data field length provided in the data telegram.

6. The method according to claim 2, wherein the check sum length is determined by the transmitter using information on the data field length provided in the data telegram.

7. A method for securing data transfer in a data bus via which data telegrams of at least one transmitter are transferred containing a data field having a variable length and a check sum, wherein a data telegram receives a variable length check sum such that a check sum having a shorter length is used when a data field length of the data telegram is shorter than when the data field length of the data telegram is longer.