Sony Corporation

Sony Group Corporation

Kensaku Wakuda

Hiroki Sato

Takahisa Someya

Tomoaki Matsumura

Yoshinobu Kure

Tomoya Oikawa

Shinji Kobayashi

Kazunori Hayashi

Eisaburo Itakura

Akio Tanaka

Osamu Yoshimura

Junji Kato

Yutaka Takahashi

Shunsuke Miura

Shoji Kasahara

A communication system comprises a transmission apparatus configured to transmit data via a plurality of communication lines, and a reception apparatus configured to receive the data from the transmission apparatus. The transmission apparatus includes processing circuitry configured to generate information regarding QoS of the plurality of communication lines. The processing circuitry is further configured to designate assignment of the data to communication lines of the plurality of communication lines on a basis of at least (i) the information regarding the QoS of the plurality of communication lines and (ii) assignment information indicating an assignment status of a data amount and a communication line transferred in the past. The transmission apparatus includes communication circuitry configured to allocate and transmit the data to the assigned communication lines of the plurality of communication lines on a basis of an instruction from the processing circuitry.

Communication system and transmission apparatus

The present technology relates to a communication system and a control apparatus that enable to properly find out a state of a network in which streaming is performed. A transmission apparatus performs streaming to a reception apparatus, and a control apparatus manages the state of a network that connects the reception apparatus and the transmission apparatus and includes a first communication line and a second communication line. The first communication line is unstable in connection state as compared with the second communication line, and the control apparatus manages the state of the network on the basis of a packet transmitted from the transmission apparatus to the reception apparatus. The present technology can be applied to a communication system that performs streaming by UDP.

Communication system and control apparatus

To prevent a decrease in transmission rate of an entirety of a system including devices that transmit data items with use of a plurality of channels ever, in a case where some of the channels change in condition, for example, decrease in transmission rate. In an information processing device including channel evaluation units, a channel selection unit, and a transmission control unit, the channel evaluation units evaluate, on the basis of an evaluation function, a plurality of channels that transmit data items via wireless communication. The channel selection unit performs selection from the plurality of channels on the basis of results of the evaluations. The transmission control unit transmits the data items to the plurality of channels subjected to the selection.

Information processing device, information processing system, and information processing method

The present technology relates to a communication system and a transmission apparatus that enable highly reliable streaming using a plurality of wireless communication lines. In a transmission apparatus, a QoS module generates information regarding QoS of a plurality of communication lines, a load balancer designates assignment of data to the communication lines on the basis at least of the information regarding QoS, and a caster allocates and transmits the data to the assigned communication lines on the basis of an instruction from the QoS module. The present technology can be applied to a communication system that performs streaming by UDP.

A reception apparatus includes a buffer and processing circuitry. The buffer is configured to store a media stream. The processing circuitry is configured to read data of the media stream from the buffer according to a first elapsed buffer time, perform a first decoding of the data read from the buffer according to the first elapsed buffer time, and output the decoded data of the first decoding via a first interface. The processing circuitry is further configured to read the data from the buffer according to a second elapsed buffer time, perform a second decoding of the data read from the buffer according to the second elapsed buffer time, and output the decoded data of the second decoding via a second interface.

Data reception apparatus, data transmission system, data reception method, and data transmission method

This data reception apparatus includes a first buffer capable of retaining a received packet at least in units of error correction blocks and a first controller that requests a transmission apparatus to retransmit a lost packet in the error correction block retained in the first buffer and performs processing of recovering the lost packet, and reads, from the first buffer, the error correction block at a point of time at which each of a plurality of particular data correction-allowed times different from each other elapses, performs error correction on each error correction block read at each point of time, and outputs each error correction result.

A multi-hop wireless terminal having a user application section, a traffic control section and a wireless transmitting/receiving section, the traffic control section enqueuing a packet of a transmission flow from the user application section and a packet of a forward flow from the wireless transmitting/receiving section in queues different for each flow and performing traffic control, where the traffic control section includes a queue manager for sorting a packet of each input flow into a corresponding queue and enqueuing the packet, and a packet scheduler for dequeuing a packet from each queue and outputting the packet, and where the packet scheduler selects from the queues a queue from which a packet is to be dequeued and output, based on transmission information of each of the flows.

Multi-hop wireless terminal and traffic control method thereof

There is provided a communication device including a communication state determination section which determines a communication state corresponding to a transmission rate demanded from a simulation engine based on a transmission rate and a state of communication at the transmission rate between a first communication state measurement device and a second communication state measurement device via a real network, a traffic generation section which generates traffic by creating data based on the communication state determined by the communication state determination section, a protocol processing section which creates a packet including the data created by the traffic generation section, and a communication section which transmits the packet created by the protocol processing section to another communication device.

Communication device, communication method, and program

There is provided a communication processing device including a sender report transmitting unit which transmits to a client a sender report including transmission information of transmission data on a regular basis separately from a rate change report, an extended receiver report receiving unit which receives from the client an extended receiver report which includes the transmission information and which is transmitted from the client when the client receives the sender report, and a rate controlling unit which controls a transmission rate of transmission data for the client, based on the transmission information stored in a transmission information storing unit and the transmission information included in the extended receiver report received from the client.

Communication processing device, communication processing system, communication processing method and program

There is provided a transmission rate control method. In this method, data is transmitted to a receiver at the most recent transmission rate R, and an RTCP packet including a reception rate Rof the data is received from the receiver. When a network is in a congestion state, or when the network is in a non-congestion state and the most recent reception achievement rate Ris higher than the reception rate R, a reception achievement rate Ris calculated as a long-term EWMA of the reception rate R. When the network is in the non-congestion state and the most recent reception achievement rate Ris lower than the reception rate R, or when a time-out of the RTCP packet occurs, the reception achievement rate Ris calculated as a short-term EWMA of the reception rate R. A transmission rate Ris set based on the reception achievement rate R.

Transmission rate control method and communication device

A communication system is provided which includes a first communication device for transmitting a plurality of packets in different packet sizes, and a second communication device having a reception unit for receiving over one or more links packets transmitted from the first communication device, and a calculation unit for calculating a packet loss rate for each packet size based on reception result of the reception unit. The communication system estimates a bit error rate during link transmission of the packets from a difference of the packet sizes of the packets transmitted from the first communication device as well as from the packet loss rate for each packet size calculated by the calculation unit.

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Kanagawa, Japan

Kensaku Wakuda