Appeal No. 96-3338
Application No. 08/442,253
BACKGROUND
The present invention relates to a method and apparatus for error detection for
messages transmitted through a network. The invention includes an additional check
correction field placed in the header of the message. This check correction field is
constructed in such a way that the data in the check correction field makes the cyclic
redundancy check (CRC) of the data field valid for the entire message. The message will
thereby automatically conform to the usual message network protocols. The check
correction field forms a check for both the data field and for the entire packet, so a single
CRC check verifies the accuracy of both the message as a whole and the data alone. This
is done by use of a CRC which is linearly superposable or divisible into components which
are linearly superposable. The sum of the check fields for the different fields is the check
field of the concatenation of the fields.
Appellants have indicated that claims 1-6 do stand or fall together. (See brief at
page 7.)
Independent claim 1 is representative of the invention and reproduced as follows:
1. In a message transmission system, check generating means for adding, to a
packet which has a check field (CRC), a header information field (RIF) to form a message,
characterized by means for calculating, from the header information field, a check
correction field (CCF) which is incorporated in the header (HDR) and preserves said
check field (CRC) as valid for the entire message (MESS).
The prior art references of record relied upon by the Examiner in rejecting the
appealed claims are:
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