Abstract: In a wireless packet transmission system that includes multiple wireless basestations and one or more wireless terminals belonging to one of the wireless basestations, transmission trees extending from two or more wireless basestations as root stations are used. Each of the wireless basestations has a tree table configured to record the root stations in association with the ID information about the transmission trees. When receiving a packet, each of the wireless basestations determines the transmission tree to be used for the packet transmission, and transmits the packet to a next node along the determined transmission tree.

Abstract: A channel allocation method for dynamically allocating channels of a plurality of radio interfaces at each access point included in a mesh network is provided. The method includes the steps of (a) acquiring, at each access point, in-node information about the access point itself, and (b) grouping high-traffic access points in a cluster using a same channel set based on the acquired information.

Abstract: A wireless communication apparatus is provided. The wireless communication apparatus includes: detection means that detects that there is another wireless communication apparatus around the wireless communication apparatus; comparison means that compares a first reference value managed in the wireless communication apparatus with a second reference value managed in the another wireless communication apparatus; means that corrects the first reference value based on the comparison result; and means that announces the first reference value to the another wireless communication apparatus. Frequencies are set such that a frequency of the wireless communication apparatus becomes same as a frequency of still another wireless communication apparatus to which a radio wave of the wireless communication apparatus does not reach but a radio wave of the another wireless communication apparatus reaches.

Abstract: A communication apparatus is disclosed, which includes an information collection unit, a storage unit, a selection unit, and a route control unit. The information collection unit is configured to collect route information and condition information. The storage unit is configured to store the route information and the connection information. The selection unit is configured to select a connection apparatuses for a terminal apparatus based on the route information and the connection information. The route control unit is configured to control routes from the communication apparatus to the connection apparatus.

Abstract: A wireless communication apparatus for performing communication via a plurality of wireless interfaces in a wireless ad hoc network is disclosed. When the wireless communication apparatus receives a request frame via one of the plurality of wireless interfaces, the wireless communication apparatus sends the request frame from at least two wireless interfaces in the plurality of wireless interfaces. In addition, the wireless communication apparatus selects a wireless interface to be used for communication from among the plurality of wireless interfaces based on the request frame.

Abstract: An inductor comprises a drum core which comprises a sintered magnetic material and has a winding axis and a pair of collars in a plate shape provided on both ends of the winding axis. The inductor further comprises a coil conductor wound on the winding axis of the drum core, the coil conductor is covered on an outer periphery thereof with a composite magnetic material in a sheet form containing a resin and magnetic powder, and the composite magnetic material in a sheet form is adhered to the outer periphery of the coil conductor except at least for inner surfaces of the pair of collars of the drum core facing each other.

Abstract: A mobile node (400) capable of establishing an ad hoc network routing is disclosed. The mobile node comprises a transmitting/receiving unit (426) for communicating with other communication unit and a routing request generator (422) for generating a routing request message for requiring an ad hoc network routing. The mobile node further comprises: an address storage (427) for storing an address of the mobile node (400) and an address of a receiving node; a random number generator (430) for generating a random number; a certificate issuing unit (440) for issuing a certificate of the mobile node (400); a digital signature creator (450) for creating a digital signature of the mobile node (400); and a controller (424) for transmitting/receiving the routing request message accompanied by the address of the mobile node, the address of the receiving node, the random number, the certificate and the digital signature via the transmitting/receiving unit, according to an ad hoc network protocol.

Abstract: A channel allocation method for dynamically allocating channels of a plurality of radio interfaces at each access point included in a mesh network is provided. The method includes the steps of (a) acquiring, at each access point, in-node information about the access point itself, and (b) grouping high-traffic access points in a cluster using a same channel set based on the acquired information.

Abstract: A process for producing a 1-pyridin-4-yl-indole represented by formula (III) as defined in the specification, which comprises reacting a pyridine compound represented by formula (I) as defined in the specification with an indole compound represented by formula (II) as defined in the specification in the presence of a base at 50 to 200° C.

Abstract: An inductor comprises a drum core which comprises a sintered magnetic material and has a winding axis and a pair of collars in a plate shape provided on both ends of the winding axis. The inductor further comprises a coil conductor wound on the winding axis of the drum core, the coil conductor is covered on an outer periphery thereof with a composite magnetic material in a sheet form containing a resin and magnetic powder, and the composite magnetic material in a sheet form is adhered to the outer periphery of the coil conductor except at least for inner surfaces of the pair of collars of the drum core facing each other.

Abstract: A fault-tolerant packet transmission system is disclosed that can avoid localized load concentration on a specific portion of a network, while autonomously keeping route optimization, without adding a route control function to non-mesh devices. In a packet transmission system including multiple wireless base stations and one or more terminal devices belonging to one of the wireless base stations, each of the wireless base stations has a location table describing each of the terminal devices associated with a corresponding wireless base station to which the terminal device currently belongs. The wireless base stations exchange the information in the location table with each other to update the location tables and forward a received packet to the next hop along a transmission route toward a destination terminal device.

Abstract: A process for producing an arylamine is provided which is characterized by reacting an aromatic halogen compound with an aromatic amine in the presence of an organic salt selected from specific pyridinium salts, imidazolium salts and quaternary onium salts, a copper catalyst, and a base. Thus, the reaction of even an aromatic halogen compound substituted by an electron-donating group proceeds efficiently, and an inexpensive chlorinated aromatic compound or brominated aromatic compound is usable, and an arylamine, in particular a triarylamine or diarylamine, having a high purity can be produced at low cost.

Abstract: A surface mount coil component has an electrode part including: internal electrodes mounted on both flanges of a drum type core over bottom surfaces and wraparound portions extending from the bottom surfaces to the end surfaces and parts of both sides. The coil conductor is conductively joined to the internal electrodes at both ends thereof. Intermediate electrodes cover from the top sides of wraparound portions of the internal electrodes on the sides of the flanges through top sides of the wraparound portion thereof on the end surfaces of the flanges to top sides of the wraparound portion thereof on the other sides of the flanges so as to leave C-shaped cross section of exposed areas of the internal electrodes. Also, plating conductive films extend from surfaces of the exposed areas of the internal electrodes to surfaces of the intermediate electrodes.

Abstract: A surface mount coil component has an electrode part including: internal electrodes mounted on both flanges of a drum type core over bottom surfaces and wraparound portions extending from the bottom surfaces to the end surfaces and parts of both sides. The coil conductor is conductively joined to the internal electrodes at both ends thereof. Intermediate electrodes cover from the top sides of wraparound portions of the internal electrodes on the sides of the flanges through top sides of the wraparound portion thereof on the end surfaces of the flanges to top sides of the wraparound portion thereof on the other sides of the flanges so as to leave C-shaped cross section of exposed areas of the internal electrodes. Also, plating conductive films extend from surfaces of the exposed areas of the internal electrodes to surfaces of the intermediate electrodes.

Abstract: A process for producing an arylamine is provided which is characterized by reacting an aromatic halogen compound with an aromatic amine in the presence of an organic salt selected from specific pyridinium salts, imidazolium salts and quaternary onium salts, a copper catalyst, and a base. Thus, the reaction of even an aromatic halogen compound substituted by an electron-donating group proceeds efficiently, and an inexpensive chlorinated aromatic compound or brominated aromatic compound is usable, and an arylamine, in particular a triarylamine or diarylamine, having a high purity can be produced at low cost.

Abstract: A channel allocation method for dynamically allocating channels of a plurality of radio interfaces at each access point included in a mesh network is provided. The method includes the steps of (a) acquiring, at each access point, in-node information about the access point itself, and (b) grouping high-traffic access points in a cluster using a same channel set based on the acquired information.

Abstract: In a wireless packet transmission system that includes multiple wireless basestations and one or more wireless terminals belonging to one of the wireless basestations, transmission trees extending from two or more wireless basestations as root stations are used. Each of the wireless basestations has a tree table configured to record the root stations in association with the ID information about the transmission trees. When receiving a packet, each of the wireless basestations determines the transmission tree to be used for the packet transmission, and transmits the packet to a next node along the determined transmission tree.

Abstract: A communication apparatus is disclosed, which includes an information collection unit, a storage unit, a selection unit, and a route control unit. The information collection unit is configured to collect route information and condition information. The storage unit is configured to store the route information and the connection information. The selection unit is configured to select a connection apparatuses for a terminal apparatus based on the route information and the connection information. The route control unit is configured to control routes from the communication apparatus to the connection apparatus.

Abstract: A mobile node (400) capable of establishing an ad hoc network routing is disclosed. The mobile node comprises a transmitting/receiving unit (426) for communicating with other communication unit and a routing request generator (422) for generating a routing request message for requiring an ad hoc network routing. The mobile node further comprises: an address storage (427) for storing an address of the mobile node (400) and an address of a receiving node; a random number generator (430) for generating a random number; a certificate issuing unit (440) for issuing a certificate of the mobile node (400); a digital signature creator (450) for creating a digital signature of the mobile node (400); and a controller (424) for transmitting/receiving the routing request message accompanied by the address of the mobile node, the address of the receiving node, the random number, the certificate and the digital signature via the transmitting/receiving unit, according to an ad hoc network protocol.

Abstract: A wireless packet communications apparatus and method are disclosed that enable enhancing of the overall system capacity by reducing, at the time of transmitting a multiple number of packets, redundant waiting time periods and appending of redundant information items.