Fujitsu Corporation

Junichiro Shitami

Jun Kawai

Akira Jinzaki

Osamu Shimokuni

A transmitter and a receiver each have an apparatus for carrying out retransmission processing at a TCP layer and an apparatus for carrying out encrypted-data communication at an IPSec layer. The apparatus operating at the IPSec layer has a buffer for storing encrypted data transmitted by the transmitter. When a request for retransmission of data is received from the receiver, in spite of an operation carried out at an IP layer, information available at the TCP layer is obtained and data corresponding to the encrypted data stored in the buffer is returned to the receiver in response to the request.

Communication-processing apparatus and its method

A communication control apparatus for enabling a quality of service (QoS) to be maintained, the security against interception to be ensured, and a communication route to be switched over without any interruption of communications, and capable of restraining the processing time and the number of adjusting parameters. The communication control apparatus including a coding unit, an allocation unit, and a sending unit.

Communication control apparatus and communication control method

A transmitter redundantly transmits data in an available band range when transmitting data. A receiver discards redundancy and receives the data. The receiver also redundantly transmits ack in an available band range. Since data is redundantly transmitted/received, there is a high possibility that data may reach the opposite party normally even if one of the duplicate data is lost. Accordingly, high-speed communication can be realized. Since time no data flows through a communication route is reduced, network resources can be effectively utilized.

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Kawasaki, Japan

Junichiro Shitami