Random access operation is performed under a communication environment in which a plurality of communication modes having different transmission rate coexist with small overhead. A high-grade communication station spoofs information of a packet length and a rate in a decoding portion so that a value of (packet length)/(rate) corresponds to a duration where the communication is hoped to be stopped. The other station receiving the spoofed information receives the rest of the packet with the designated rate during the interval designated by the value of (packet length)/(rate). In this case, the packet length and the rate are not those of actually transmitted packet so that this packet is discarded.

Wireless communication system, wireless communication apparatus, wireless communication method, and computer program

The present invention provides a system for operating a power line communications system that is comprised of a plurality of network elements, which may take the form of repeaters, bypass devices, backhaul devices, wireless backhaul devices, enhanced bypass device, communication interface devices and others. In one embodiment, two groups of network elements in the same electrical distribution system are isolated except selected communication link.

Power line communication system and method of operating the same

The present invention provides a system for operating a power line communications system that employs surface wave communications and conducted communications. The system is comprised of a plurality of network elements, which may take the form of repeaters, communication interface devices, backhaul devices, medium voltage transducers, distribution points, aggregation points, and others. In one embodiment, surface waves are communicated over the medium voltage power lines and the conducted communications are communicated via the low voltage power lines to and from customer premises.

Surface wave power line communications system and method

A device for providing communications through power lines that are communicatively coupled to an electrical distribution network infrastructure and to the internal wiring of at least one customer premises having one or more communication devices therein is provided. One embodiment comprises a coupler configured to be coupled to the electrical distribution network infrastructure, a modem in communication with the coupler to communicate data through the power lines; and a wireless transceiver in communication with said modem. In some embodiments, the electrical distribution network infrastructure may be a structure that uses electricity, such as a street light.

Device and method for coupling with electrical distribution network infrastructure to provide communications

System and method for wireless power transfer based on values set to comply with limits from multiple different agencies.

Biological effects of magnetic power transfer

From an electric pole outside to a cordless handset inside a building/facility, a communication line is established via an electric power line. At this point, it is judged whether or not electric power line communication is possible, and if electric power line communication is possible, the communication line between the cordless handset and a base unit is switched to an electric power line communication system, and a communication line is formed via an optical fiber cable from the electric power line. By measuring the communication quality levels of all lines of the wireless and electric power lines, the communication line having the highest communication quality level may be selected.

Communication system, communication terminal and communication method

A wireless communication apparatus is provided in which a frequency band, a signal type, and a transmission power conforming to radio law of a country that uses a first wireless communication system are set by means of a receiving status of a specific signal of a second wireless communication system, so that user friendly wireless communication apparatus regarding operations thereof can be provided. In the wireless communication system 1 according to the present invention, an area information acquisition portion 2 acquires information on an area in which the wireless communication system presently exists. Based on communication setting information in the wireless communication system corresponding to area information stored in an information memory portion 4, an area information judgment portion 3 judges communication setting information capable of being set in the wireless communication system in accordance with the area information acquired from the area information acquisition portion 2. Based on the communication setting information judged by the area information judgment portion 3, communication parameter control setting portion 5 controls communication settings of the wireless communication system.

Wireless communication system, wireless communication apparatus, and wireless communication method

A communication device includes a communication circuit part, a transmission path for signals, a ground, a coupler electrode, and a resonance part. The coupler electrode includes an upper flat part as an electrode, a support, and a connecting portion. The support supports the upper flat part. Thus, the upper flat part faces the ground and is separately placed therefrom at a height only enough to ignore the wavelength of the signal, while having a flexible portion which is elastically deformable in the height direction. On the connecting portion, the other end of the support is connected to the transmission path. The resonance part enlarges a current flowing into the coupler electrode through the transmission path. A micro dipole is a line segment connecting between the center of accumulated electric charge in the coupler electrode and the center of mirror charge accumulated in the ground.

Communication device, high-frequency coupler, coupler electrode, and composite communication apparatus

PROBLEM TO BE SOLVED: To provide communication equipment, a communication system, a communication method, and a program for quickly and simply determining transmission reception start of a data file in short-range one-to-one communication. SOLUTION: The communication equipment includes: a communication part 102 for performing short-range one-to-one communication with another device by electric field coupling or magnetic field coupling; a detection part for detecting the direction of its own device, movement, or contact; a processing determination part 120 for determining the start of transmission of a data file to equipment where communication is established or the start of reception of a data file from the equipment where communication is established in accordance with the detected direction, movement, or contact; and a determined processing cancellation part 120 for canceling the start of the determined transmission or the start of the reception. COPYRIGHT: (C)2010,JPO&INPIT

Communication equipment, communication system, communication method, and program

There is provided a communication apparatus including a magnetic sheet that includes an opening, a non-contract power supply coil that is disposed on the magnetic sheet, a high-frequency coupler that includes a coupling electrode, a ground, and a resonance unit configured to increase an amount of current flowing into the coupling electrode, and is configured such that the coupling electrode appears on the magnetic sheet via the opening, and a communication circuit unit that processes a high-frequency signal transmitted to and received from the coupling electrode.

Satoshi Konya

Papers

Communication system, communication terminal and communication method

Wireless communication system, wireless communication apparatus, and wireless communication method

Communication device, high-frequency coupler, coupler electrode, and composite communication apparatus

Communication equipment, communication system, communication method, and program

Communication apparatus and communication system