Systems and methods for interoperability positive train control
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United States of America Patent
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Dec 10, 2013
Grant Date -
May 2, 2013
app pub date -
Dec 18, 2012
filing date -
Sep 25, 2009
priority date (Note) -
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Abstract
A method of messaging in a communications system includes generating a message at an application layer. The message and associated message handling codes are passed to a transport layer and the message fragmented. The fragmented message and the message handling codes are passed to a network layer and the fragmented message selectively segmented as indicated by the message handling code. The selectively segmented message and the message handling code are passed to a link layer and formed into a packet including packet type information and data parts. The packet is passed to a physical layer and a preamble is added. The preamble and packet are transmitted with a radio.
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