Nec Corporation

Tomohiro Kikuma

Hiroaki Miyamoto

Kojiro Hamabe

Yusuke Inaida

A point-to-point radio apparatus (A orB) is configured to perform a first channel search (S) to search for an idle channel available to use in a first point-to-point radio link (A) in response to receiving a first notification (S) indicating that a second point-to-point radio link (E) operated by another point-to-point radio system (E) is unavailable. This contributes to, for example, efficient channel searches in point-to-point radio systems.

Point-to-point radio apparatus, mobile backhaul system, and communication control method

Provided are an antenna angle adjustment device, an antenna angle adjustment system, an antenna angle adjustment method, and a communications device, whereby the angle of an antenna can be adjusted to a direction in which direct waves can be more reliably received. A direction information generation unitgenerates direction information indicating a direction of one antenna from another antenna. A range information generation unitgenerates range information indicating a range of a main beam of the another antenna. A determination unitdetermines, based on the range information and the direction information, whether or not the one antenna is in a range indicated by the range information.

Antenna angle adjustment device, antenna angle adjustment method, and communications device

An image generating apparatus () includes a first image generating unit () and a second image generating unit (). The first image generating unit () generates a first image showing, in a two-dimensional coordinate system the coordinate axes of which respectively correspond to angles of an antenna () in two axial directions, reception quality information indicating a quality of a received signal received by the antenna () at each antenna angle being the angles of the antenna () in the two axial directions. The second image generating unit () generates a second image that is a photographed image of a direction in which the antenna () faces at the antenna angles. Accordingly, provided is an image generating apparatus capable of easily and accurately adjusting an antenna in the most appropriate direction.

Image generating apparatus, communication apparatus, antenna adjustment method and image generating method

Provided is a display device that enables easy adjustment of an antenna in the most appropriate direction. An antenna angle acquisition unit () acquires antenna angle information indicating an antenna angle which is a horizontal angle and a vertical angle of an antenna () for receiving a signal from a radio wave generation source. A reception quality acquisition unit () acquires reception quality information indicating a quality of a received signal received by the antenna () at the antenna angle acquired by the antenna angle acquisition unit (). A display unit () displays an antenna adjustment image where the antenna angle information and the reception quality information are associated with each other based on the acquired antenna angle information and the acquired reception quality information.

Display device, image generation device, communication device, communication system, antenna adjustment method, image generation method, and non-transitory computer readable medium storing program

A radio apparatus () notifies a radio apparatus () of a new reverse channel to be used in a reverse link () and another idle reverse channel(s). If reachability of a forward link () is lost by the use of a new forward channel associated with the new reverse channel, the radio apparatus () determines a further new forward channel from among forward channel(s) associated with the idle reverse channel(s) of which the radio apparatus () has been notified by the radio apparatus (). This contributes, for example, to a safe switch of the bidirectional operating radio channels without using a redundant connection, when frequency-division multiplexing with fixed frequency spacing is used.

Point-to-point radio system, point-to-point radio apparatus, and communication control method

A radio scheduling apparatus in a radio communication system in which a modulation scheme is selected in accordance with radio quality includes radio quality acquisition means and scheduling means. The radio quality acquisition means acquires radio quality information indicative of radio quality for each mobile station. The scheduling means determines the degree of urgency for assigning a radio channel according to the radio quality, based on the radio quality information acquired by the radio quality acquisition means, and preferentially assigns a radio channel to a mobile station having a high degree of urgency.

Radio scheduling apparatus, radio communication system, and radio scheduling method

A radio burst signal transmission system operates to switch between a first control process for optimizing the number of bits added per symbol depending on the probability of successful reception of a successful reception indication signal and a second control process for divisionally sending a burst signal, depending on the state of a propagation path between a base station and a terminal. A fragmentation control request determining circuit in each of the base station and the terminal determines an average value and a variance value of time-depending variations of an error of a propagation path function, and a burst signal length of a reception burst signal, from the reception burst signal that is received from the terminal and the base station, and determines a pointer for requesting switching from the first control process to the second control process. When the terminal and the base station receive the request from the base station and the terminal, respectively, a fragmentation control circuit switches from the first control process to the second control process and sends a transmission burst signal to the base station and the terminal if the burst signal length of the reception burst signal exceeds a predetermined value.

High-efficiency control of radio burst signal transmission system

A cellular phone system, in which the probability that the deterioration of channel quality and the phenomenon of a call drop occur caused by the imperfection of the control of the changing over to the different frequency can be lowered and the channel quality can be made to be higher, is provided. A first base station communicates with a mobile communication terminal by using a first frequency, and a second base station communicates with the mobile communication terminal by using a second frequency. And while the mobile communication terminal is communicating with the first base station by using a channel, the reception quality of the second frequency is measured corresponding to the change of the quality of the channel, and the channel is changed over to the second base station corresponding to the measured reception quality and the change of the quality of the channel. And in case that the quality of the channel is within a predetermined first range and when the change of the quality of the channel is larger than a designated value, the reception quality of the second frequency is measured at the mobile communication terminal. And in case that the quality of the channel is without the predetermined first range, the reception quality of the second frequency is measured more frequently at the mobile communication terminal, compared with the case that the quality of the channel is within the predetermined first range.

Cellular phone system and mobile communication terminals and base station controlling apparatus in the system and method changing over to different frequency in the system

A method for changing over to different frequency in a cellular phone system, in which lowering the probability generating a call drop and decreasing the power consumption when the moving velocity of a mobile communication terminal connecting a micro-cell becomes high can be realized. A judging threshold value Th_HO using at the changing over to the different frequency is changed corresponding to the moving velocity of the mobile communication terminal. When the moving velocity of the mobile communication terminal connecting to a micro-cell becomes high, the judging threshold value Th_HO is changed to be a small value, and the probability changing over to the different frequency is made to be high, and it makes easy for the mobile communication terminal to connect to a macro-cell. With this, the probability generating the call drop can be decreased.

Method for changing over to different frequency at cellular phone system and cellular phone system using the method and base station controlling apparatus in the system and mobile communication terminal in the system

A cellular phone system, in which the probability generating a call drop is lowered and the processing ability in a base station controlling apparatus can be used effectively, is provided. At a cellular phone system, in which a mobile communication terminal can connect to a first base station by using a carrier frequency and can connect to a second base station by using a different carrier frequency, the mobile communication terminal measures reception quality in the carrier frequencies during the communication with the first base station. When the currently using carrier frequency is changed over to the different carrier frequency based on the measured results of the reception quality, a threshold value for changing over to the different carrier frequency is changed corresponding to the traffic in the currently using carrier frequency by the base station controlling apparatus.

Method for changing over to different frequency at cellular phone system and cellular phone system using the method and base station controlling apparatus in the system

Growing community of inventors

Tokyo, Japan

Tomohiro Kikuma