Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Panasonic Intellectual Property Corporation of America

Eiichi Muramoto

Takahiro Yoneda

Kazunobu Konishi

Ryota Ohnishi

Thilmee Baduge

Ettikan Kandasamy Karuppiah

Boon Ping Lim

Pek Yew Tan

Taisuke Matsumoto

Ichiro Takei

Masashi Kobayashi

Yuta Shimotsuma

Toyoki Kawahara

Yuki Minoda

Ryutaro Ono

Yoshinori Matsui

Fumiaki Suzuki

Naoyuki Mochida

Nobuaki Oue

Kok Hoong Yap

Thoai Nam

Chih-chang Hsu

Jonathan Tan Ming Yu

A router includes a content store (CS) that stores content, a packet processing determination unit that determines whether a received interest packet is a best available (BA) interest packet, and an optimum content request processor that if it is determined that the interest packet is a BA interest packet and if the optimum content request processor determines that content having higher quality than the quality of the content stored in the CS can be acquired from an upstream router, on the basis of the quality of the content stored in the CS and constraining conditions of the BA interest packet, forwards the BA interest packet to the upstream router.

Communication controller, communication control method, and communication control system

A communication control apparatus connected to a content-oriented network includes a transmitter, a receiver, a memory, and a processor. The transmitter transmits an interest packet requesting a plurality of pieces of content. The receiver receives a first data packet including (i) a first piece of content, which is one of the pieces of content, and (ii) first PIT information representing a name of a second piece of content, which is another of the pieces of content and which has not been transmitted from a transmission source. The memory stores a transmission PIT in which names of the pieces of content are registered. The processor registers, in response to transmission of the interest packet, the names of the pieces of content registered in the transmission PIT, and deletes, in response to reception of the first data packet, a name of the first piece of content from the transmission PIT.

Communication control apparatus and communication control method

A roadside device transmits first detection data obtained by a first sensor to a server. The server extracts an unobservable area that is a blind spot of the first sensor, based on the first detection data, and transmits unobservable-area information indicating the unobservable area to a moving terminal. The moving terminal extracts, based on second detection data obtained by a second sensor, second dynamic information indicating an object that exists in a sensing range of the second sensor, and determines whether or not an overlapping area where the unobservable area indicated by the unobservable-area information and the sensing range of the second sensor overlap each other exists. Upon determining that the overlapping area exists, the moving terminal transmits, to the server, third dynamic information that is included in the second dynamic information and that indicates an object that exists in the overlapping area.

Dynamic-map constructing method, dynamic-map constructing system, and moving terminal

A reception terminal is provided in a communication system including a transmission terminal that transmits packets in a real-time stream and a transfer terminal that caches and transfers packets transmitted from the transmission terminal. The reception terminal includes a receiver which receives packets, and circuitry which obtains a first available band between the reception terminal and the transfer terminal and a second available band between the reception terminal and the transmission terminal. The reception terminal includes a transmitter which transmits requests to the transfer terminal at a frequency that is based on the first available band, wherein the frequency defines how often the requests are transmitted and the requests trigger transmission of packets from the transfer terminal to the reception terminal in the first available band. The transmitter notifies the transmission terminal of the second available band to trigger transmission of packets from the transmission terminal in the second available band.

Transfer terminal and transfer method performed thereby

Reception terminal

A congestion control method includes determining whether congestion occurs by monitoring a network, receiving an interest packet including a name of content data that is requested to be sent, generating a first NACK packet indicating an occurrence of congestion if it is determined that the congestion occurs when the interest packet is received, and sending the generated first NACK packet to the network. In the generating of the first NACK packet, if first alternative content data which is an alternative of the content data corresponding to a name included in the received interest packet is stored in a cache of the router, information regarding the first alternative content data is set in the first NACK packet. At least one of the determining whether the congestion occurs, the receiving the interest packet, the generating the NACK packet, and the sending the NACK packet is performed by a processor of the router.

Router, terminal, and congestion control method for router and terminal

A method used in a server includes configurating a dynamic map by superimposing time-changing information on a road onto a static map based on first data indicative of surrounding information acquired by a first sensor mounted in a roadside unit; computing a first region that is incapable of being observed by the first sensor; receiving a plurality of attribute information items related to respective second sensors mounted in respective vehicles running on the road from the vehicles; selecting a specific second sensor from among the second sensors based on the attribute information items and the first region; receiving specific second data acquired by the specific second sensor among a plurality of pieces of second data acquired by the second sensors; reconfigurating the dynamic map by filling the first region by using the specific second data; and distributing the reconfigurated dynamic map to at least one of the vehicles.

Communication method and server for reconfiguration of a dynamic map

A receiving terminal () has: a reception stack unit () which connects to a communication network; an issuance management unit () which transmits a data request packet; and an H-RTT measurement unit () which determines a timeout period until retransmission of the data request packet, and in accordance with the determined timeout period, performs retransmission of the data request packet until data is received by the reception stack unit (). The reception stack unit () connects to the communication network via a plurality of communication interfaces. The issuance management unit () transmits the data request packet from each of the plurality of communication interfaces. The H-RTT measurement unit (), for each of the communication interfaces, measures the RTT between the communication interface and a data-bearing node, and on the basis of the RTT, determines a timeout period.

Receiving terminal and receiving method

A device is provided that is connected with a content centric network. The device includes a request reception unit that receives a request packet that requests data that are generated by the device. The device also includes a data transmission unit that transmits the requested data to a CCN network in a case where the data that are requested by the request packet, which is received by the request reception unit, are present in the device. The device further includes a negative acknowledgement unit that transmits a packet that indicates a negative acknowledgement, which includes information about a generation time as a time when the requested data are generated to the CCN network, in a case where the data that are requested by the request packet that is received by the request reception unit are absent in the device.

Device, device management apparatus, relay apparatus, and terminal apparatus that are connected with content centric network, and communication method

A relay node includes interfaces, a request statistical table that stores therein information concerning a request in an entry generated for each chunk, a request statistics processor that records a reception time and sending source information concerning a request in the request statistical table, a target request determining unit that determines whether or not a currently received request is a target request, a delay amount determining unit that determines a delay amount for a received request, which is a target request, and a delay processing unit that delays forwarding a received request or content data for a delay amount.

Data relay apparatus and method, server apparatus, and data sending method

A server according to the present disclosure includes: a converting unit that converts content data to enhance a real-time property, and creates a packet of the converted content data; and a server control unit that updates a routing table that describes processing for an interest packet, wherein when an interest packet for content including converted content data is received, the server control unit performs control of issuing an interest packet for original content data of the content which is to be converted, and when original content data to be processed is received from a CCN, the server control unit performs control of causing the original content data to be converted, a packet of the converted original content data to be created, and the packet of the converted original content data to be transmitted as a response packet for the interest packet for the content including the converted content data.

Transcoding and dynamic error correction for content centric networks using a proxy server

A wireless communication terminal includes a processor; and a non-transitory memory storing thereon a program which is executed by the processor, the program causing the processor to: transmit a first interest packet requesting transmission of an index of content to a plurality of communication devices via a content-oriented network; receive a first data packet from a first communication device among the plurality of communication devices in response to the first interest packet, wherein the first data packet includes i) the index and ii) first remaining battery level information indicating a remaining battery level of the first communication device, and determine to transmit to the first communication device a second interest packet requesting for transmission of the content to the wireless communication terminal when it is determined that the first remaining battery level information is more than a predetermined threshold value.

Wireless communication terminal and wireless communication method

A reception terminal in which a decrease in transmission performance can be prevented when CCN is applied to a best-effort network and real-time streaming packets are transmitted. Reception terminal () has: an available band estimation unit () for estimating a first available band, which is an available band between the reception terminal () and a transfer terminal for caching and transferring real-time streaming packets transmitted from a transmission terminal, and a second available band, which is an available band between the reception terminal () and the transmission terminal; and an RTCP-R controller () for requesting the transfer terminal to transfer packets and thereby causing the transfer terminal to transfer packets using the first available band at a frequency based on the estimated first available band, and communicating the estimated second available band to the transmission terminal and thereby causing the transmission terminal to transmit packets using the second available band.

Communication system, reception terminal, transmission terminal, and flow rate control method

A communication apparatus includes a packet output unit that performs normal transmission of a normal packet and retransmission of at least one retransmission packet, a feedback receiver that receives a retransmission request that designates a retransmission packet to request retransmission, and a controller that determines that the retransmission packet for the received retransmission request is to be transmitted or is scheduled to be transmitted based on an amount of data scheduled to be transmitted for a predetermined period.

Communication apparatus, communication method, and program

A communication control method includes: receiving data, acquired by respective terminals, through a communication network; accumulating the received data in an information recording medium; obtaining an intra-network transmission time, which is an estimated value of a maximum time taken for transmission from when the data are acquired by the respective terminals until the data are received through the communication network; determining, of the accumulated data, the data whose time from an acquisition time point when the data is acquired by the terminal until a current time is shorter than the intra-network transmission time; excluding, of the accumulated data, the data whose time is determined to be shorter than the intra-network transmission time from data used for predetermined processing; and executing the predetermined processing by using the data excluding the data whose time is determined to be shorter than the intra-network transmission time.

Growing community of inventors

Kanagawa, Japan

Eiichi Muramoto