Providing reliable communication over an unreliable transport layer in a hand-held device using a persistent session
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United States of America Patent
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Dec 12, 2000
Grant Date -
N/A
app pub date -
May 6, 1997
filing date -
May 6, 1997
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The disclosed system provides a UDP+ connection-oriented protocol layer that reliably communicates over the UDP transport layer in a hand-held device. By providing reliable communication over the UDP transport layer instead of using the TAP transport layer, memory requirements are reduced, and applications running on the hand-held device have reliable data transfers performed on their behalf. Additionally, the UDP+ layer is designed to communicate using a 'persistent session.' A persistent session is a mode of communication where, when a connection terminates, the data associated with the connection, including the packets that have not yet been transferred, is not discarded. Instead, in using a persistent session, UDP+ retains the data associated with a connection after it terminates, reestablishes the connection, and completes the data transfer. By performing such a persistent session, application programs using UDP+ do not need to retain a copy of the packets passed to UDP+, and the code of the application programs is simplified, because the application programs do not need to keep track of which packets were successfully transferred when the connection terminates.
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