Abstract: A communication apparatus generates a single physical frame including a plurality of MAC frames, and transmits the physical frame. The physical frame has variable-length bitmap information comprising bits corresponding to the plurality of MAC frames, respectively, and length information of the bitmap information.

Abstract: In a gateway device for carrying out a data relaying at a transport or upper layer between a first terminal device and a second terminal device which are capable of carrying out communications through networks, information regarding a security association set up between the first terminal device and the second terminal device in order to carry out communications with guaranteed data secrecy or in order to carry out communications with guaranteed data authenticity managed, and the decryption/encryption processing or the authentication processing is carried out according to the managed information regarding the security association along with the data relaying at the transport or upper layer.

Abstract: The present invention relates to an optical fiber for amplification, an optical amplifying apparatus, and so on, having a structure for enabling increase of power of output light, suppression of occurrence of nonlinear optical phenomena, and compact storage all together. The optical amplifying apparatus comprises an optical fiber for amplification amplifying input light inputted together with pumping light from a pumping light source. The optical fiber for amplification comprises a core region doped with a rare-earth element, and a cladding region provided on an outer periphery of the core region and having a refractive index lower than that of the core region. The core region has an outer diameter of 10 ?m or more but 30 ?m or less, and has a relative refractive index difference of 0.5% or more but 2.0% or less with respect to the cladding region. The cladding region has an outer diameter of 75 ?m or more but 200 ?m or less.

Abstract: An axial-air-gap brushless vibration motor has an eccentric rotor R in which an axial-air-gap magnet and an arched weight are provided in a rotor yoke which is rotatably mounted on a shaft fixed to a yoke bracket. A stator base is attached to the yoke bracket which includes a magnetic portion receiving the magnetic field of the magnet and a nonmagnetic portion. One Hall sensor and a drive circuit member for receiving output of the Hall sensor are disposed so that they do not overlap on a radial plane, of the stator base which has single-phase air-core armature coils installed. A cover member is welded to the yoke bracket.

Abstract: A radio base station apparatus used in a radio communication system in which an initiator holds a transmission opportunity (TXOP) period in a frame exchange sequence and a responder responds to the initiator in the frame exchange sequence is disclosed. The apparatus includes a setting device which sets a ratio between a first period necessary for transmitting a first frame from the initiator to the responder and a second period necessary for transmitting a second frame from the responder to the initiator. The apparatus also includes a calculation device which calculates the first period to be used by the initiator and the second period to be used by the responder, on the basis of the transmission opportunity period and of the ratio which is set.

Abstract: An image formation method including forming at least one invisible image selected from invisible images formed when (a) forming only an invisible image on the surface of an image output medium, (b) forming an invisible image and a visible image by laminating these images one by one on the surface of the medium and (c) forming an invisible image and a visible image separately in different regions on the surface of the medium, in which at least one of the images (a), (b) and (c) is composed of a two-dimensional pattern, and in which the invisible image is formed using a toner that includes at least a binder resin and a near-infrared light absorbing material of inorganic material particles in which the rate of absorption in the visible region of the toner is 15% or less and the average dispersion diameter of the absorbing material is 50–800 nm.

Abstract: A radio communication device is provided with a unit for acquiring a prediction information for a frequency, time or direction to be used by each one of the first radio control scheme of the radio communication device and a second radio control scheme of another surrounding radio communication device, and a unit for obtaining a predicted frequency, time or direction for which interferences between radio communications by the first radio control scheme and radio communications by the second radio control scheme are predicted to occur according to the prediction information, and control the radio communication unit to carry out radio communications by avoiding the predicted frequency, time or direction.

Abstract: A wireless LAN communication system is composed of: a wireless LAN network including an AP 4 as one of the network apparatuses and a terminal 5 as one of the wireless terminals; and a wired network such as a LAN 1 to which the AP4, an authentication server 2, and other apparatus (such as a DHCP server 3) are connected.

Abstract: A wireless communication apparatus for performing wireless communication using a first channel having a first frequency bandwidth, and a second channel formed of both the first channel and a second communication channel, the second communication channel having a frequency bandwidth equal to the first frequency bandwidth. A first generation of a first declaration frame for declaring occupation of the first channel for a specified period, and a second generation of a second declaration frame for declaring occupation of the second communication channel for a specified period after the first declaration frame are generated and transmitted. Transmission timings are set so that the first and second declaration frames are transmitted at the highest priority of all the other frames.

Abstract: An eccentric rotor wherein a printed wiring board in which commutator segments are formed at a first surface, two wound air-cored coils arranged with a prescribed arrangement angle about the shaft as a center at the second surface of the printed wiring board, and a weight are integrally molded into a disk-like shape with a resin by injection molding. The weight comprises a first surface of the weight which is exposed at the side surface of the rotor together with the first surface of the printed wiring board and a second surface of the weight which is exposed at the other surface of the rotor together with the wound air-cored coil. The resin which integrates the aforementioned components and forms an outer peripheral resin portion having a circular-arc periphery about the shaft as a center. The outer contours of the weight and printed wiring board are so formed as to assume positions separated from the outer periphery inwardly in a circular-arc portion.

Abstract: A communication system includes a first network on which a file server and an access point are connected via a first communication link and a second network on which the access point and a terminal are connected via a second communication link. The terminal establishes a connection with the access point to access the file server. The file server stores a file to be downloaded. The terminal accesses the file server through the access point to request the file. The terminal then selects a download process from one of a foreground process, background process and postponement process, and executes the download process to download the file from the file server.

Abstract: A physical frame is generated and transmitted to a destination terminal. In this physical frame, one of a data frame, an acknowledgement frame, and an acknowledgement request frame, and a transmission permission frame which is used in place of a normal Ack frame associated with a delayed Block Ack, and permits the destination terminal to perform piggyback transmission, are aggregated.

Abstract: A communication apparatus includes a receiving device configured to receive a physical frame in which a plurality of MAC frames, each having a sequence number, are aggregated. A reception buffer which stores MAC frames of the physical frame received by the receiving device. A determination device determines whether or not the first MAC frame in the physical frame received by the receiving device has been successfully received. A reception buffer management device determines, when the first MAC frame has been successfully received, a MAC frame to be forwarded to an upper layer, on the basis of the sequence number of the first MAC frame, and extracts the MAC frame from the reception buffer.

Abstract: A communication system includes a first network on which a file server and an access point are connected via a first communication link and a second network on which the access point and a terminal are connected via a second communication link. The terminal establishes a connection with the access point to access the file server. The file server stores a file to be downloaded. The terminal accesses the file server through the access point to request the file. The terminal then selects a download process from one of a foreground process, background process and postponement process, and executes the download process to download the file from the file server.

Abstract: A communication device configured to receive a first packet from a first network including a virtual network, and to transmit a second packet to a second network, the communication device including: a receiver section configured to receive the first packet from the first network; a converter section configured to convert a second destination address of the first packet to the first destination address of the second packet using identifying information of the virtual network; a selector configured to select a security parameter based at least in part on the first destination address of the second packet; an encryption section configured to encrypt the second packet based on the security parameter; and a transmitter section configured to multicast the encrypted second packet to the second network.

Abstract: An information communication scheme for enabling the radio base station to carry out both point-to-point user information communications and point-to-multipoint user information communications with respect to radio terminals is disclosed. A first media access control identifier is allocated to a radio terminal which made a connection request, a correspondence between the first media access identifier and the radio terminal is broadcast, and a user information destined to the radio terminal is transmitted using a time-slot corresponding to the first media access control identifier. On the other hand, a second media access control identifier is allocated to a multicast information identifier, a correspondence between the second media access control identifier and the multicast information identifier is transmitted, and the multicast information is transmitted using a time-slot corresonding to the second media access control identifier.

Abstract: An access point apparatus includes a first communication unit sending a radio terminal a beacon representing the availability of an access point apparatus, and receiving a connection request signal from the radio terminal in response to the beacon; a second communication unit communicating with a control unit which controls a load state of the access point apparatus via the first communication unit; a memory storing connection control information received from the control unit via the second communication unit, the connection control information depending upon the load state of the access point apparatus; and a connection control unit controlling the operation of the first communication unit on the basis of the connection control information.

Abstract: A communication apparatus includes a receiving device configured to receive one physical frame in which a plurality of MAC frames are aggregated. This physical frame includes one acknowledgement request frame for the plurality of MAC frames. The apparatus includes an acknowledgement frame forming device configured to form an acknowledgement frame representing reception statuses of the plurality of MAC frames in response to the acknowledgement request frame. The apparatus also includes a transmitting device configured to transmit the acknowledgement frame. This acknowledgement frame includes a compressed acknowledgement frame representing an acknowledgement bitmap having a size equal to a maximum number of MSDUs (MAC Service Data Units) when one MPDU (MAC Protocol Data Unit) corresponds to one MSDU.

Abstract: A brushless motor has a drive circuit component mounted on a stator which has plating conducted on a copper foil land to facilitate soldering. Need for a plating line from the outside is eliminated by providing an internal plating connection trace connected to a power feed terminal portion which is subsequently cut by a guide hole for an armature coil. An adhesive resin is applied to the stator where the circuit drive component is installed and the guide hole to adhere simultaneously to the stator to a bracket and the armature coil to the stator and bracket.

Abstract: An axial-air-gap brushless vibration motor has an eccentric rotor R in which an axial-air-gap magnet and an arched weight are provided in a rotor yoke which is rotatably mounted on a shaft fixed to a yoke bracket. A stator base is attached to the yoke bracket which includes a magnetic portion receiving the magnetic field of the magnet and a nonmagnetic portion. One Hall sensor and a drive circuit member for receiving output of the Hall sensor are disposed so that they do not overlap on a radial plane, of the stator base which has single-phase air-core armature coils installed. A cover member is welded to the yoke bracket.