Panasonic Corporation

Panasonic Intellectual Property Corporation of America

Matsushita Electric Industrial Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Satoshi Senga

Toshio Oka

Shinichiro Nishioka

Hiroshi Ishida

Takeshi Kanazawa

Hidenori Ishii

Masaki Sato

Hirokazu Kobayashi

Takayuki Nishikawa

Kazushige Yamada

Akino Inoue

Toshimasa Takaki

Masaki Takahashi

Takuji Maeda

Masayuki Toyama

Isao Kato

Sachiko Takeshita

Yuusaku Ohta

Kazuma Takeuchi

Ryo Yokoyama

Koji Nakamura

Ming Qiang Xu

Go Nakano

Ming-Fong Yeh

Go Matsushita Electric Industrial CoLtd Nakano

Ming Qiang Matsushita Electric Industrial Xu

Provided is an initiator apparatus that, when issuing access requests for remote access via wireless communication to a storage section that processes only one access request at a time, can easily detect timeouts with one timer irrespective of the number of access requests issued via wireless communication. In this apparatus, an access-request processor () sends one or more access requests to a target apparatus () provided with a storage section that processes only one access request at a time and receives access acknowledgments for the access requests from the target apparatus (). Until all the access requests are completed, a timeout detector () resets the timer operation and starts it again each time an access request is sent or an access acknowledgment is received, and detects a timeout when the timer operation exceeds a timeout period.

Initiator apparatus, target apparatus, communication system, timeout detection method, and timeout detection program

A transport header analyzing unit () analyzes, on the basis of the TCP header of transport data transmitted from a transmitter terminal () to a receiver terminal (), whether the transport data is an acknowledgement response in a TCP communication. If the transport data is not an acknowledgement response, a synchronization pre-processing unit () determines, on the basis of the TCP header of the transport data, whether synchronization information, which is required to operate in a power saving mode together with an access point (), is added to the IP header of the transport data. A synchronization information processing unit () adds, to the IP header of the transport data indicating an acknowledgement response to received data that is received from the transmitter terminal (), the synchronization information that is required to operate in the power saving mode together with the access point ().

Wireless communication system, data transmitter apparatus, data wireless receiver apparatus, and wireless communication method

A functional device can communicate with an access apparatus through wireless communication. At least one additional device can be connected to the functional device. The functional device includes an access controller that performs an initialization process of the additional device to obtain characteristic information of the additional device from the additional device, before establishing communication between the access apparatus and the functional device, a memory that stores the obtained characteristic information, a communication unit that performs transmission and reception of data with the access apparatus, and a communication controller that transmits the characteristic information stored in the memory to the access apparatus without performing an initialization process of the additional device, upon establishment of communication with the access apparatus by the communication unit.

Functional device, access system, and communication establishing method

An objective of the present invention is to determine a function of each communication apparatus with few steps. A first communication apparatus () is capable of carrying out at least one of a function of an apparatus which receives an access thereto from a second communication apparatus (), and a function of a host which accesses the second communication apparatus (). The first communication apparatus () comprises: an access request issuing unit () which issues a request which denotes the function thereof to the second communication apparatus (); and a conflict assessment unit () which, either when the request and a request which the second communication apparatus () has issued conflict or when the request is rejected, makes the access request issuing unit () reissue a request to the second communication apparatus () which denotes another function.

Communication device, communication method, and communication program

A portable terminal wherein the amount of processing and power consumption when performing repair is reduced and video data can be reliably repaired, and video data repair method and program of the same. The portable terminal is provided with a video data repairer that repairs video data in which video is poor by replacing it with a portion of video data acquired from an external source, said video data repairer saving, without deleting at the time of repairing, all of partial video data necessary to decode subsequent video data continuing after the video data to be repaired, and performing control so that only the portion of the video data that is repaired is re-encoded.

Portable terminal, video data repair method and program

A TCP transmission control device and a method of controlling a TCP transmission are provided that achieve greater efficiency of TCP transmission processes for applications that use intermittent transmission methods. A communication terminal includes a TSO control unit, which determines whether a TCP session open for data transmission is using a TCP segment link transmission process. The communication terminal also includes a link management unit, which manages all information consisting of the session identifiers employed in TCP sessions, and link transmission processing usage information and maximum number of TCP segment links notified from the TSO control unit, on a per TCP session basis.

TCP transmission control device and method of control of TCP transmission

This electrical power-receiving apparatus makes it possible to suppress a decline in power supply efficiency in a variety of different circumstances while avoiding an increase in circuit scale. This apparatus comprises an impedance control unit () for sequentially switching through any one of a plurality of charging devices in a charging device group (), as candidate charging devices for a supply destination to which electrical power is to be supplied. The impedance control unit () also selects from the candidates a charging device to which electrical power is actually supplied, on the basis of the difference between the impedance of the charging device group () for each candidate and the impedance of an electrical power receiving antenna unit (), and causes electrical power to be supplied to the selected charging device.

Electrical power receiving apparatus and electrical power receiving method

A secure communication device for high-speed encryption/decryption authentication including network stack processing. An encryption/decryption authentication controller of the secure communication device acquires the result of processing of the encrypted/decrypted or authenticated previous packet from an encryption/decryption authenticator and controls a network protocol processor so that the second half of the processing of the network protocols of the previous packet and the first half of the processing of the network protocols of the current packet are continuously performed.

Secure communication device, secure communication method, and program

A protocol delay measuring device prevents an increase of the processing overhead of a communication terminal attributed to a protocol delay measurement. The measuring device determines the protocol delay by using first and second timestamps created respectively before and after a processed packet is obtained from an unprocessed packet by IPsec processing by the communication terminal. An acknowledges creates an identifier of the unprocessed packet. A timestamp database stores the created identifier along with the first timestamp and writes the identifier in a storage where the identifier is kept the same before and after the IPsec processing by the communication terminal. A correlator reads the identifier from the storage and extracts the first timestamp stored along with the same identifier as the read identifier in the timestamp database. A calculator calculates the difference between the extracted first timestamp and the second timestamp as the protocol delay.

Protocol delay measuring device and protocol delay measuring method

A wireless communication device is quickly connectable to an access point of a destination service area without wasting power when the wireless communication device moves from a service area to a different one. When a state change detector of the wireless communication device detects that the received radio field intensity of the radio wave from the connected access point lowers to a threshold or less, a service area information acquirer acquires information on the service area where the wireless communication device is present and information on a neighboring service area. A profile information acquirer acquires profile information corresponding to the service area information. A priority order setter sets the order of priority to the acquired profile information in such a way that the access point of a neighboring service area neighboring to the service area formed by the connected access point is precedingly connected. According to the profile information to which orders of priority are set, a request for connection to the access point is made.

Wireless communication device and access point connection method

An encryption device, a decryption device, an encryption method, and a decryption method effectively perform encryption and decryption by using a packet type judgment result. An encryption/decryption device includes a packet reception unit that acquires a packet, a first encryption engine that is formed by hardware and encrypts or decrypts a packet; and a second encryption engine that encrypts or decrypts a packet by using software. The encryption/decyption device also includes a head data identification unit that judges the real time feature of the acquired packet according to the header information on the acquired packet, and an encryption/decryption process judgment unit that decides the acquired packet encryption destination or decryption destination in accordance with the real time feature from the first encryption engine and the second encryption engine. Since it is possible to separate the encryption by hardware from encryption by software according to the packet real time feature, it is possible to effectively perform encryption and decryption.

Encryption device, decryption device, encryption method, and decryption method

A radio network controller outputs a context required for a terminal capable of communicating with a mobile communication network and a wireless local area network to communicate with the wireless local area network to the terminal among pieces of information input from wireless access gateways that control connection with one or more wireless local area networks and provide seamless handover of packet communication between the mobile communication network and the wireless LAN.

Radio network controller, wireless access gateway, radio communication system, and communication method for radio communication system

A 3G authentication apparatus includes: a WLAN communication section which receives a notification of reception of a connection request sent from a WLAN access network in response to the connection request from a mobile unit to connect to a WLAN capable of interworking with a mobile network; a communication section for obtaining, from a user information storing device, information indicating a service available in the mobile communication network to the mobile unit that has sent the connection request, on the basis of the notification of reception of the connection request; and a filter setting section which generates filter information by associating a user authentication ID identifying a mobile unit with an IP address obtained at the communication section. The filter information generated by the filter setting section is sent to the WLAN access network through the WLAN communication section. Thus, traffic in a network such as a WLAN in an interworking system between networks such as a mobile communication network and a WLAN can be reduced.

Communication management apparatus, communication control apparatus, and wireless communication system

A terminal () includes interfaces for communication with a mobile network () and a wireless LAN (). A first IMS server () performs IMS call control processing relating to terminals located in the mobile network () and a second IMS server () relays a signal relating to IMS call control processing concerning terminals located in the wireless LAN (). These IMS servers search for a mobile network packet gateway (), a packet data gateway (), and a gateway to be controlled by a route change request for requesting change of a packet transmission path and relay the route change request. The route change request provided from the terminal () is relayed by the IMS servers to provide the change request to all networks specified. The packet transmission path is changed by the gateway in accordance with the request. Thus, the terminal having the interfaces for both of the mobile communication network and the wireless LAN can select a network to use for each communication port.

Radio communication system and radio communication method

A communication control apparatus, communication terminal apparatus, server apparatus, and communication control method are provided that continue video and/or voice communication in a way that feels seamless to the user even when communication conditions change in a mobile environment. Newly introducing a lower layer management section that notifies an upper layer of lower layer information such as field intensity and network congestion into a conventional communication terminal apparatus, which is configured in such a way that this lower layer information is concealed from the application, enables the connection control section that provides the application's service generation environment to recognize lower layer information directly, and makes possible various kinds of status determination and control changes based on lower layer information at the application level.

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Kanagawa, Japan

Satoshi Senga