CRC calculation for data with dynamic header

Details CRC calculation for data with dynamic header CRC calculation for data with dynamic header

2006-12-26

2006-12-26

Chung, Phung My (Department: 2138)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S781000, C714S714000, C714S808000, C714S807000

Reexamination Certificate

active

07155658

ABSTRACT:
A method for performing CRC calculations on packets with dynamic headers is disclosed. The header may be changed during transmission across a network. When the header is changed, a CRC associated with the header is recalculated such that a residue of the initial seed value is always obtained. A final CRC covers the entire packet including the header and its header CRC, or just the data portion of the packet. The final CRC remains valid and unchanged during transmission of the packet, allowing an endpoint along the network to confirm the validity of the entire packet. By only changing the CRC associated with the changed portion of the packet (the header CRC), the introduction of errors during transmission of the packet is minimized.

REFERENCES:
patent: 5954835 (1999-09-01), Higginson et al.
patent: 6021133 (2000-02-01), Asghar
patent: 6324667 (2001-11-01), Sugaya
patent: 6425106 (2002-07-01), Higginson et al.
patent: 6643816 (2003-11-01), Uesugi et al.

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