Appeal No. 2000-1561
Application No. 08/768,922
network communication medium. An order number assigned to a data
packet received from the data terminal is stored and compared
with the order number of a successfully transmitted data packet
after receipt of a confirmation message from a receiving
terminal. As a result of the comparison operation, only
untransmitted packets are subjected to a resending operation,
thereby eliminating the necessity of retransmitting an entire
data file in the event of a communication interruption.
Representative claim 4 is reproduced as follows:
4. A packet transfer device for transferring data
between a data terminal and a communication network in the
form of data packets, comprising:
number assignment means for assigning an order number
to a data packet to be sent to a selected receiver through
said network, and for storing the assigned order number in a
number storage means;
transmission means for sending said packet to said
receiver, and for receiving data from said receiver;
transmitted packet order number storage means for
sequentially storing an order number of a packet received by
said receiver as confirmed by data in a message sent from
said receiver via the network; and
discrimination means for discriminating whether a data
packet to be sent by said transmission means has been
previously transmitted or not by comparing the assigned
order number of said data packet to be sent as stored in the
number storage means with the order number of a last packet
confirmed as having been received, as stored in the packet
number storage means.
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