Packet expansion with preservation of original cyclic redundancy code check indication
US6542470B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 1999 |
| Grant date | Apr 1, 2003 |
| Priority date | — |
| Expiry date | May 26, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/40
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A system for appending data to a packet whereby the original CRC calculated by the transmitting station is not modified and is retained in order to determine the occurrence of transmission errors at the receiver. The invention is applicable in communication systems whereby the data to be appended to the packet comprises a fixed length. The invention appends the data in the form of a tag to the tail of the packet after the original CRC and, in addition, determines and appends a tag CRC to the tail of the packet following the tag data. The tag CRC has a value such that the CRC machine in the receiver generates a constant CRC value even though the packet length was increased. A tag CRC is generated that when appended to the packet produces the same result as if the packet was processed through the CRC machine without any data appended.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.