Nec Corporation

Matsushita Electric Industrial Co., Ltd.

Tsutomu Kitamura

Masao Yamazaki

Masayoshi Kobayashi

Takayuki Shizuno

Estimation is carried out with high accuracy based on flow quality information in a situation where, although a set of links that may have a flow passing through is known, which of such links the flow passed through cannot be identified, such as multi-paths routing, load distribution routing, and the like. A device for estimating a quality-degraded location includes a flow quality information collecting section that collects communication quality of a flow of a network, a routing information collecting section that collects routing information of the network, a determining section for determining a quality-degraded flow and a quality-non-degraded flow based on the flow quality information to determine a link through which the flow passes from the routing information of the network, a non-degraded link elimination section that eliminates a link not configuring multi-paths as a non-degraded link without eliminating a link configuring multi-paths as a non-degraded link, for a link on a path of the flow, with respect to the quality-non-degraded flow, and a degraded link determining section for determining a degraded link from links not eliminated as the non-degraded links.

Device, method, and program for estimating quality-degraded location of communication network, and communication network system

A processing capability for data communication with a packet terminal is secured while packet loss is prevented, and a load to a mobile station in a handover is reduced. A wireless communication system comprises mobile stationsandeach having a wireless interface a configured with an antennaand a wireless transmission/reception unitas well as a wireless interface b configured with an antennaand a wireless transmission/reception unit, MAC addresses being assigned to the wireless interfaces, and base stationsandfor performing data transfer with the mobile stationsand, a L2SWfor switching base stations that performs the data transfer, and a packet terminalfor performing the data communication with the mobile stationsand. When the mobile stationsandperform the handover, a data transfer MAC address assigned to the wireless interface (one of a and b) is reassigned to the other wireless interface.

Wireless communication system, mobile station and handover control method

To provide a data communication system which lightens processing related to changes in the status in signaling processing performed between terminals. A signaling server communicating mutually with a plurality of terminals includes: a transmitting/receiving part for transmitting/receiving a message; a status management part for updating a registered terminal list and status management information; and a signaling processing part for judging a destination and a type of the message received at the transmitting/receiving part. The signaling processing part gives an instruction to the status management part to update the status management information in accordance with contents of the message without transferring the message to a first terminal, when the first terminal requires the signaling processing support and the message is not directly related to starting or stopping of communication with the first terminal.

Signaling server, data communication system, signaling processing proxy method and program

An external network relay device measures group movement parameters that are used to determine whether the need exists to change the group affiliation of internal network relay devices. When the results of measuring the group movement parameters meet conditions that have been set in advance, the external network relay device transmits group movement notification messages instructing group movement to the internal network relay devices of its own group and causes the internal network relay devices to change to other groups.

Access network system and method of moving internal network relay devices

A mobile station for communicating with a plurality of base stations, including: a field strength detecting circuit that detects a wave strength received from the base stations and outputs a received wave strength; and a base station switching control circuit that makes a comparison between the received wave strength and a first field strength threshold level, wherein, when the received wave strength is higher than the first field strength threshold level, data communication with one of the base stations which is in a connected state is performed, and when the received wave strength is lower than the first field strength threshold level, a search for base stations is performed.

Mobile station, radio communication system, base station switching control method, program, and recording medium

Horizontal moire phenomenon is reduced by producing a control signal by a moire canceling circuit comprising a frequency divider (1,201,301,401) and a horizontal position shifting circuit (2, 202, 302, 402), and supplying the control signal to a deflection circuit block (3).

Display monitor including moire cancellation circuit

In a vertical deflection circuit of a display monitor including a vertical deflection coil 41 and a sigmoid correction capacitor 42 connected to the vertical deflection coil 41, a series connection circuit consisting of a resistor 21 and a switch 22 connected in series with each other is connected in parallel with the sigmoid correction capacitor 42. By turning the switch 22 on and off in response to a control signal having a period twice as long as a period of the vertical synchronizing signal, a current flowing through the resistor 21 and the switch 22 is periodically added to a vertical deflection current, thereby causing shift of displaying points on a screen to make the moire phenomenon unnoticeable.

Apparatus for eliminating moire pattern effects resulting from the use

Phase adjustment circuit

A television receiver compatible with both American and European systems in which, in the case of switching from the American system mode to the European system mode, the voltage at the center tap of a variable resistor, through which is supplied a tuning voltage, is caused to drop to a lower level so that the tuning voltages for the reception of European system high- and low-band VHF television channels can be obtained.

Growing community of inventors

Tokyo, Japan

Tsutomu Kitamura