Toshiba Memory Corporation

Yujen Lai

Kenichi Maeda

Yosuke Bando

Masahiro Ishiyama

Hiroki Kudo

Takeshi Sakoda

Hironori Uchikawa

Osamu Torii

Hiroto Nakai

Ren Sakata

Yusuke Doi

Takaomi Murakami

Youyang Ng

According to one embodiment, a communication apparatus includes a radio interface unit that sends a data message to a receiver and extracts, when a message sent by the receiver via unicast with an optimized transmission rate is received, rate information indicating the optimized transmission rate of the receiver from the received message, a message processor that generates the data message, in which a multicast identifier indicating a multicast group is a destination, and outputs the data message to the radio interface unit, and a selector that selects, according to the rate information, a data message transmission rate to send the data message.

Communication apparatus and communication method

According to one embodiment, a communication apparatus includes a congestion degree calculating unit and an operation mode setting unit. The congestion degree calculating unit calculates a third congestion degree related to wireless communication based on a first congestion degree of first wireless communication and a second congestion degree of second wireless communication. In the first wireless communication, peer-to-peer communication is performed directly between communication apparatuses, and in the second wireless communication, communication is performed through a wireless communication device. The operation mode setting unit switches an operation mode of the first wireless communication based on the third congestion degree to either of a mode in which the communication apparatus transmits content or a mode in which the communication apparatus receives content.

According to one embodiment, a communication apparatus includes an operation mode storage unit that stores a mode in which the communication apparatus operates as a wireless base station or a terminal and a non-volatile memory, wherein a transmission message is output to the outside when the communication apparatus operates as the wireless base station, data included in a received reception message is stored in the non-volatile memory when the communication apparatus operates as the terminal, and when the communication apparatus operates as the wireless base station, after all data transmitted from a first external wireless base station is received, if a communication quality with the first wireless base station is less than a predetermined value, and no message is received from a wireless base station other than the first wireless base station, a channel selection and switching process is performed, and then the operation mode is changed from the terminal to the wireless base station.

According to one embodiment, a communication deviceoperating as a publisher calculates parity of a certain size which is capable of being commonly used for each of different data units from data to be sent each time receiving a lost notification from one or more communication deviceoperating as subscribers, the lost notification indicating that one or more data units are lost, and sends the calculated parity to the one or more communication devicesoperating as the subscribers.

Communication device and communication system

Growing community of inventors

Kawasaki, Japan

Yujen Lai