Nec Corporation

Go Fujimoto

Tsukasa Kobayashi

Yusuke Yokota

A satellite constellation apparatus, a satellite constellation system, a method, and a non-transitory computer-readable medium that can prevent instantaneous interruption of communication are provided. A traffic control ground station is capable of communicating with a plurality of satellites and includes a communication control unit configured to predict a functional link through the plurality of satellites at a time point later than the present time point by a predetermined time based on trajectories of the plurality of satellites and control switching of transmission destinations of communication data transmitted and received by the satellites so that communication is performed by using the predicted functional link before a functional link through the plurality of satellites at the present time point is disconnected at the time point later by the predetermined time.

Satellite constellation apparatus, satellite constellation system, method, and non-transitory computer-readable medium

A communication device () includes a wireless LAN interface () that wirelessly communicates with an access point (), a wireless LAN interface () that wirelessly communicates with an access point (), an encapsulation unit () that encapsulates, in accordance with a specified encapsulation protocol, a transmission frame to be transmitted to a communication device () at the other side via Layer 2 tunneling, and a redundancy unit () that generates a first encapsulated frame where a MAC address of the wireless LAN interface () is set to a source MAC address and a second encapsulated frame where a MAC address of the wireless LAN interface () is set to a source MAC address by using the encapsulated transmission frame.

Communication device, communication system, communication method, and non-transitory computer readable medium storing communication program

The packet capsulation deviceincludes capsulation meansfor encapsulating an initial packet in communication between a first terminal and a second terminal serving as a partner terminal by adding a header for capsulation, and for non-encapsulating on reception of an encapsulated packet, storage meansfor storing data capable of identifying a path of a packet following the initial packet in the wireless communication channel, and non-encapsulated packet transmission meansfor transmitting the packet following the initial packet to the wireless communication channel without encapsulating, according to the data capable of identifying the path of the packet.

Packet capsulation method and packet capsulation device

A control meanssets, with respect to a packet transfer means, control information that defines an operation of the packet transfer meansaccording to header information of a packet. In a case of being set to a learning mode to learn a new record and in a case where an item corresponding to a condition that can be specified from an IP address is designated as an item a condition of which is to be learned, the control meanssets, in the packet transfer means, control information indicating permission for communication by a new packet when header information of the new packet is notified by the packet transfer means. Then, the control meansadds, to the list, a record in which a condition specified from an IP address in the header information is described in the designated item.

Communication apparatus, communication system, communication control method, communication program and device connection control program

Provided is a communication system in which an administrator can easily perform setting for communication. When having received a new packet, which is a packet for which control information conforming to header information has not been set yet, a packet transfer meansnotifies a control meansof header information of the new packet. The control meansholds a list of items that can be specified from an IP address, and sets control information in the packet transfer meanson the basis of an item specified from an IP address included in the header information and on the basis of the list, when the header information is notified from the packet transfer means

Communication system, communication control method, and communication program

To realize a portable telephone which can always receive the user information via a MBMS service. The portable telephone includes: an antenna for transmitting/receiving radio waves to and from a network; a wireless section for modulating/demodulating radio waves transmitted/received by the antenna; and a control section which has a function of analyzing and processing Layer 3 messages including MBMS related messages demodulated by the wireless section and wherein, upon recognizing that there is user information which has not been received while receiving user information via a MBMS service in the PtM mode, the control section transmits a request to provide the MBMS service in PtP mode to the network via the wireless section.

Growing community of inventors

Tokyo, Japan

Go Fujimoto