Error recovery of variable-length packets without sequence...

Multiplex communications – Pathfinding or routing – Switching a message which includes an address header

Reexamination Certificate

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Details

C370S473000, C370S395100, C370S395520, C455S418000, C455S419000

Reexamination Certificate

active

10907662

ABSTRACT:
Variable-length packets transmitted over a serial link do not have packet-start fields or unique symbols to mark the beginning of each packet. Instead, a length field indicates the packet's length, allowing the end of the packet to be located. Packets also do not have sequence numbers. When an error is detected, the receiver sends a control symbol over a reverse channel to signal the transmitter. The control symbol never occurs in a normal packet. Packet buffers in the transmitter and receiver have read and write pointers and also have de-allocation pointers that are synchronized between receiver and transmitter. As packets are error checked, the receiver advances its de-allocation pointer and updates the transmitter's de-allocation pointer, allowing the packets to be discarded from the transmitter's buffer only after the receiver finishes error checking. The transmitter re-transmits packets from its buffer starting from the de-allocation pointer when its receives the control symbol.

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