Multiplex communications – Communication techniques for information carried in plural... – Adaptive
Reexamination Certificate
1998-07-24
2001-08-14
Chin, Wellington (Department: 2664)
Multiplex communications
Communication techniques for information carried in plural...
Adaptive
C370S392000, C370S349000, C370S389000
Reexamination Certificate
active
06275503
ABSTRACT:
FIELD OF THE INVENTION
The invention relates in general to a method for removing unwanted data packet header or tailer information. More specifically, the present invention relates to a method for transmitting large data messages over transmission windows that are smaller than the data message.
BACKGROUND AND RELATED ART
A revolution is occurring in the design of avionics systems for commercial air transports. The classic avionics system has a federated architecture. It consists of a set of functions, each of which is implemented in one or more Line Replaceable Units (LRUs). This federated architecture is being replaced by an integrated architecture that combines multiple functions into fewer LRUs. Integration offers many benefits, including: lower weight, lower power consumption, increased reliability, less frequent maintenance and greater flexibility. But precisely because functions share hardware resources, greater care must be taken to ensure they will operate correctly, even if co-resident functions fail. This is the engineering challenge of integrated architectures.
While prior art media access protocols have included strict time division multiple access protocols and table driven proportional access protocols, these systems have proven unsatisfactory since functions routing through the bus may conflict. Typically this has been resolved by allowing the functions to “arbitrate” their priority. However, in order to determine priority, the functions must transmit priority information, along with time window and storage memory address information, along with the actual data message. This increases the message size needed by any one function. It would be useful to have a protocol system that does not require the inclusion of additional address, time window, or priority information.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an innovative method for removing unwanted data packet header or tailer information.
It is another object of the present invention to provide a method for transmitting large data messages over time windows that are smaller than the transmitted data message. This is accomplished by partitioning the large data message into smaller packets. Packet control information is attached to the packets and they are transmitted over the transmission window in reverse sequential order, from the last created packet to the first created packet. Immediately after each packet is transmitted, it is written into a memory pre-allocated memory location. Subsequently transmitted packets are written into adjacent location, however, they are shifted in position such that they overwrite the packet control information that was attached to the previously written packet. This is repeated until all of the packets have been transmitted and written and the large data message reintegrated and coherent.
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ARINC, Backplane Data Bus, ARINC Specification 659, Published: Dec. 27, 1993.
Chin Wellington
Honeywell International , Inc.
Pham Brenda
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