Hitachi-Kokusai Electric Inc.

Sumie Nakabayashi

Munemitsu Kuwabara

Toshiyuki Aritsuka

Masaru Adachi

Kazuhito Yaegashi

Yuichi Onami

Naoki Hashiguchi

Koji Aramaki

Hirotake Usami

A radio transmitter/receiver having a QoS control unit for outputting the transmission data in order taking the quality of service (QoS) into consideration. In the case where the information transmission rate for a radio section is not lower than a threshold value, the QoS control operation of the transmission data is omitted, and the transmission data are output in the order of input. In the case where the information transmission rate for the radio section is lower than the threshold value, on the other hand, the QoS control mode is switched in accordance with the information transmission rate for the radio section.

QoS control method for transmission data for radio transmitter and radio receiver using the method

On the basis of state change information acquired by one of sensor nodes forming a sensor network, an instruction indicative of emitting a signal is issued to another node to acquire a photographed image from a camera. An image processing device identifies the ID and actual position of the node by issuing the signal issuance instruction to the node and detecting a signal obtained from the node from the photographed image. On the basis of personal information stored in a database, the image processing device detects a not-allowed action.

Node management system and node managing program using sensing system

An encrypted data communication system for communicating an encrypted stream as an encrypted data stream from a device at transmitting end to a device at receiving end to suppress the effect of an erroneous detection of a dummy code is disclosed. A device at transmitting end generates a data stream having the bit sequence of a marker for determination, a synchronization marker and a location identification code after the data, encrypts the bit sequence of the data and the marker for determination and transmits the encrypted stream. A device at receiving end receives the encrypted stream, detects the bit sequence of the synchronization marker and the location identification code and decrypts the encrypted stream. In the case where the bit sequence of the data and the marker for determination is decrypted, the detection of the valid bit sequence is determined, while the detection of a dummy bit sequence is determined otherwise.

System and method for communicating encrypted data

Data to be encrypted is effectively encrypted by a data delivery system for encrypting the data to be encrypted with a transmitting apparatus and decrypting a cipher thereof with a receiving apparatus. In a configuration for encrypting and decrypting the data to be encrypted by using a random number sequence generated by a random number generating portion for generating the random number sequence uniquely decided from an input parameter, the transmitting apparatus generates the input parameter to perform encryption based on metadata of the data to be encrypted while the receiving apparatus generates the input parameter to perform cipher decryption based on the metadata embedded in the data to be encrypted.

Encryption method, encryption apparatus, data storage distribution apparatus and data delivery system

An error correction encoding rate selection table is provided in an error correction processing unit of a packet transfer apparatus, and the table stores an error correction encoding rate preset to maintain a desired QoS in correspondence with a protocol type and an application type. When a transmission packet is transferred to a wireless transmission path, an encoding control unit judges the protocol type and application type of a transmission packet from a header of the transmission packet, in accordance with a judgment result and the error correction encoding rate selection table, an error correction encoding rate is selected, and the transmission packet is subjected to error correction encoding and transferred.

Growing community of inventors

Kokubunji, Japan

Sumie Nakabayashi