Patent application number | Description | Published |
20090189780 | IT SYSTEM - In order to realize road-road communications, a roadside device is provided with an MS function unit and a BS function unit that have a termination function of a signal. In a case of performing road-road communications, any of plural roadside devices can function as a BS, and others as an MS. In a wireless communication system that only enables wireless communications between MS and BS, road-road communication can be performed. In order to realize vehicle-vehicle communication, an in-vehicle device has the BS function unit and the MS function unit having a termination function of the signal and performs the same operations as the road-road communication. In road-vehicle communication, any of the roadside devices can function as the BS, and other roadside devices and in-vehicle devices are operated as the MS. | 07-30-2009 |
20090279499 | Wireless resource allocating apparatus, on-vehicle apparatus, and wireless resource allocating system - A wireless resource allocating apparatus includes a ranging signal receiving unit that receives a signal indicating that an on-vehicle apparatus loaded on a vehicle is present within a predetermined area, an on-vehicle apparatus quantity calculating unit that calculates the number of on-vehicle apparatuses present within the area from the signal received by the ranging signal receiving unit, a wireless resource allocating unit that allocates wireless resources to be used for inter-vehicle communication among a plurality of on-vehicle apparatuses present within the area and non-inter-vehicle communication between the on-vehicle apparatuses and a communicating apparatus other than the on-vehicle apparatuses based on the number of on-vehicle apparatuses calculated by the on-vehicle apparatus quantity calculating unit, and an allocation instruction transmitting unit that instructs an on-vehicle apparatus present within the area to use the wireless resources allocated by the wireless resource allocating unit. | 11-12-2009 |
20090296680 | Wireless Communication Method in Traffic System, Wireless Base Station, and Wireless Terminal - An on-vehicle device sends an allocation request for a wireless resource to a roadside device. The roadside device, in response to receiving this allocation request, allocates a roadside-vehicle resource that is a wireless resource for roadside-vehicle communication with the on-vehicle device, and an inter-vehicle resource that is a wireless resource for inter-vehicle communication between on-vehicle devices; and sends the allocation information to the on-vehicle device. The on-vehicle device carries out roadside-vehicle communication with the roadside device using the roadside-vehicle resource identified with the allocation information received from the roadside device, and carries out inter-vehicle communication with other on-vehicle devices using the inter-vehicle resource identified with the allocation information. Thereby, roadside-vehicle communication and inter-vehicle communication can be achieved with higher utilization of wireless resources while avoiding the hidden terminal problem. | 12-03-2009 |
20100260163 | OFDMA communication apparatus - An OFDMA communication apparatus is disclosed that operates under media access control based on an OFDMA standard and modulates transmission data into an OFDMA signal. The OFDMA communication apparatus includes a preamble generating unit that generates plural types of preamble patterns; a broadcast generating unit that generates broadcast data; a burst generating unit that generates a data burst according to the transmission data; a data multiplexing unit that generates multiplexed data by multiplexing the data generated by the preamble generating unit, the broadcast generating unit, and the burst generating unit on a predetermined physical layer format; an OFDM unit that performs orthogonal frequency division multiplexing on the multiplexed data using plural sub carriers; a carrier assigning unit that assigns the preamble patterns to at least four sub carrier groups; and a symbol assigning unit that divides the preamble patterns into plural sub pattern element groups that are time-multiplexed on the predetermined physical layer format. | 10-14-2010 |
20110026543 | MOBILE COMMUNICATION APPARATUS, COMMUNICATION METHOD, AND COMMUNICATION SYSTEM - A mobile communication apparatus includes a storage unit that stores therein correspondence information correlating area and transmission resource; an area deducing unit that deduces in which area the mobile communication apparatus is located; a selecting unit that selects the transmission resource correlated, in the correlation information stored by the storage unit, with the area deduced by the area deducing unit; and a transmitter that using the transmission resource selected by the selecting unit, transmits data to a second mobile communication apparatus. | 02-03-2011 |
20120155446 | WIRELESS COMMUNICATION SYSTEM - A wireless communication system includes: a plurality of mobile terminals; a plurality of transceivers, each of the transceivers performing wireless communication with a mobile terminal; a plurality of baseband processors which modulates data to be transmitted to one of the transceivers and demodulates data received from one of the transceivers; a switch which switches the connection of the transceivers and the baseband processors; and a controller which calculates an operation rate of the transceivers and the baseband processors, respectively, continues or stops a power supply for driving the transceivers and the baseband processors in accordance with a calculation result of the operation rate, and controls the switch to reconnect the transceivers coupled to one of the baseband processor of which the power supply has been stopped to another baseband processor of which the power supply is continued. | 06-21-2012 |
20140051440 | BASE STATION, COMMUNICATION SYSTEM, AND WIRELESS RESOURCE ALLOCATION METHOD - A base station provided with an interference judging unit judging if an amount of interference which occurs between the base station and a peripheral cell in wireless resources, allocated to a mobile station, is in an allowable range, a registering unit receiving a reception operation for registering a mobile station in a storage device which the base station can access, and a resource control unit allocating wireless resources to only mobile stations which are registered at the registering unit and changing the wireless resources to be allocated to the registered mobile station, when the amount of the interference is not in the allowable range. | 02-20-2014 |
20140287677 | WIRELESS BASE STATION, WIRELESS COMMUNICATION SYSTEM, AND TRANSMISSION POWER CONTROL METHOD - A second transmission power control different from a first transmission power control being performed on a first wireless terminal connected to a wireless base station without a relay station is performed on a second wireless terminal connected to the wireless base station through the relay station. | 09-25-2014 |
20140293789 | BASE STATION, CONTROL METHOD, AND COMMUNICATION SYSTEM - A base station includes a communicating unit that relays communication between a network and a mobile terminal that is capable of using plural communication schemes that respectively use differing transmission routes to a network; a measuring unit that measures a delay amount in the transmission route of each of the communication schemes; and a switching unit that among the communication schemes and based on predetermined information that includes the measured delay amount, switches the communication scheme used for relaying the communication. | 10-02-2014 |