Ntt Docomo, Inc.

Rie Nagato

Osamu Nakamura

Yoshihiro Ishikawa

Shinji Uebayashi

Takayuki Ishiguro

Naoto Shimada

Takeshi Okamoto

Seizo Onoe

Hiroyuki Hosono

Kazunori Obata

Takeshi Terayama

A radio controllerincludes a transmission power acquisition unitconfigured to acquire a neighboring cell transmission power value that is a transmission power value of a radio signal transmitted from a base station forming the neighboring cell, an offset determination unitconfigured to determine a power offset of the neighboring cell to be added to the predetermined transmission power value, based on a difference between the predetermined transmission power value and the neighboring cell transmission power value acquired by the transmission power acquisition unit, and an offset notification unitconfigured to notify the power offset determined by the offset determination unit to the mobile station.

Mobile communication system, radio controller, base station, and mobility control method

A femto base station according to the present invention includes: a downlink perch channel signal transmission power controller unit configured to change a transmission power of a downlink perch channel signal when a first condition is satisfied; and an uplink reception sensitivity controller unit configured to change an uplink reception sensitivity when a second condition is satisfied after the first condition is satisfied.

Base station and mobile communication method to change a transmission power of communication channel

A measuring apparatus for measuring service quality in an area in a communication system, in which a plurality of base stations use one frequency band for transmitting downlink signals, includes: a receiver configured to receive constant power signals that are the downlink signals transmitted by the base stations through constant power channels in which transmission powers are constant; a reception power measuring unit configured to measure reception powers of the constant power signals transmitted by the respective base stations; a reception power selector configured to select a reception power which is a base for measurement of the quality in the area, out of the reception powers measured by the reception power measuring unit; and an area quality measuring unit configured to measure the quality in the area on the basis of the reception power selected by the reception power selector, and a total of the reception powers not selected by the reception power selector.

Measuring apparatus and area quality measuring method

A base station comprises: an interference quantity measurement unit configured to measure an interference quantity toward a frequency band used in a communication system in which the base station is provided; an allowable interference quantity calculation unit configured to calculate an allowable interference quantity toward the frequency band, which is allowed to maintain a determined number of terminal equipments connecting lines with the base station, based on the measured interference quantity and the determined number of the terminal equipments; a reception unit configured to receive a request of connecting the line transmitted by the terminal equipment; and an acceptance control unit configured to control an acceptance of the request for connecting the line by comparing the measured interference quantity with the allowable interference quantity.

Base station and communication method

A call-admission controller is disclosed that allocates, out of shared resources in a communications system, resources required for communication in multiple calls of different priorities. The controller includes an impact-judging unit configured to make a judgment of, when having detected a low-priority call, the impact of the low priority call on the communications system, and a low-priority call admission-determining unit configured to make, based on the impact of which the judgment is made, a determination of whether to admit the low-priority call.

Call-admission controller and method of call-admission control

A mobile communication system is provided that employs a data communication control method that includes a radio control apparatus that communicates with a mobile station that performs VOX control using a first frequency band area and a second frequency band area. Receiving a request for data transmission to the mobile station, the radio control apparatus determines whether radio wave transmission and reception are being performed with the mobile station in a communication operation using the first frequency band area. The radio control apparatus then determines a transmission time for data transmission in a communication operation using the second frequency band area, based on a communication pattern of the mobile station that is a data transmission destination designated by the request for data transmission. If radio wave transmission and reception are not being performed in the communication operation using the first frequency band area, the radio control apparatus transmits the requested data to the data transmission destination mobile station within the determined transmission time.

Radio control apparatus, data communication control method, and mobile communication system

A communication channel allocation method allocates a communication channel to communications between a mobile terminal device and a second radio base station using a second frequency band which is close to a first frequency band used by a first radio base station, by detecting a first distance between the second radio base station and the first radio base station, detecting a second distance between the second radio base station and the mobile terminal device when the first distance is less than a first threshold, and allocating a communication channel of a frequency far from the first frequency band in the second frequency band to the communications between the second radio base station and the mobile terminal device when the second distance is less than a second threshold.

Growing community of inventors

Yokosuka, Japan

Rie Nagato