Nec Corporation

Jsr Corporation

Akio Aoyama

Kojiro Hamabe

Koujirou Hamabe

Akihiko Morikawa

Fumio Kurihara

Masaki Maeda

Satoshi Oura

Junji Koujina

Fumihiko Ono

Ikuko Arai

A mobile radio terminal includes a positional information acquisition unit to measure the position of the mobile radio terminal as position information using a Global Positioning System; a reception status acquisition unit to detect a handover failure; and a controller to send information of the position information and handover failure information to a base station.

Method of collecting information in mobile communication system

An indoor/outdoor determination program, etc., whereby an indoor or outdoor state can be determined with higher precision than by a determination method based on satellite reception strength in which a threshold value is difficult to set. The indoor/outdoor determination program according to the present invention causes a step to be executed for determining whether a mobile terminal is present indoors or outdoors on the basis of satellite elevation angle information and/or satellite azimuth angle information acquired directly or indirectly from a satellite receiver provided to the mobile terminal.

Recording medium on which indoor/outdoor determination program is recorded, indoor/outdoor determination system, indoor/outdoor determination method, mobile terminal, and means for classifying and determining indoor/outdoor environment

[Problem] To provide a site position priority order determination device and associated method with which it is possible to create a high-reliability site position priority order list in a shorter time. [Solution] The present invention has: a radio communication apparatus; a site position priority calculation unit for calculating the degree of nonattainment and the estimated degree of attainment for target service quality at a site position, the degree of tightness of a cell load, the degree of cell capacity supplied in response to demand traffic, and the degree of dominance of competing companies regarding service quality, calculating the weighted sum of these values, and outputting the result as site position priority; a site position priority storage unit for saving the individual site position priority per site position; and a site position priority order determination unit for determining, on the basis of the site position priority per site position, the priority order of a site position at which a new wireless base station is installed, and outputting a site position priority order list indicating the determined priority order of the site position.

Site position priority determination device and method

There are disclosed a method of and a system for collecting information related to operation of a radio communication system inexpensively and easily. A mobile radio terminal monitors a communication status of user communication, and detects as a trigger when the communication status has satisfied a predetermined condition. When a trigger is detected, the mobile radio terminal acquires a reception status of a radio signal and the position of the mobile radio terminal. The mobile radio terminal sends measured information including the reception status and the position to an information collecting server. The information collecting server receives the measured information from the mobile radio terminal and records therein the measured information which has been received.

A wireless terminal that carries out communication by a wireless circuit includes information acquisition means, transmission means, and transmission control means. The information acquisition means measures the communication quality of the wireless circuit. The transmission control means issues an instruction to the transmission means to transmit area quality information when basic transmission trigger conditions that have been determined in advance as time information are satisfied and when additional transmission trigger conditions are satisfied that have been determined that correspond to the state of the wireless terminal such that battery consumption is reduced. Upon receiving the instruction, the transmission means transmits area quality information that includes the communication quality that was measured by the information acquisition means.

Wireless terminal, wireless communication system, and area quality information collection method

A received electric field intensity estimates device estimaties a received electric field intensity when a signal is received, by using at least a gain in a transmitting direction indicating the direction of the receiver viewed from a transmitter's side from among gains in the individual directions of the antenna's directive pattern of a transmitter's antenna, and outputs the estimated intensity. The device includes: an averaging unit for averaging gains in the individual directions of the antenna's directive pattern within an angular range of an arrival wave angle indicating the direction of the signal arriving at the receiver, taken as the relevant direction; and a received electric field intensity calculation unit using at least the gain in the transmitting direction from among gains in the individual directions of the antenna's averaged directive pattern, and for outputting the result of the calculation as the estimated received electric field intensity.

Received electric field intensity estimating device and received electric field intensity estimating program

In a throughput estimation method for estimating throughput of a first channel in a cellular system in which the first channel and a second channel that are used for an uplink wireless communication service in a cell, noise rise of the second channel is calculated from the traffic volume of the second channel, the noise rise and a target RTWP that is the target total reception power of the base station that is set in the base station are used to calculate a ratio of resources used for the wireless communication service that can be allocated to the first channel, and the resource ratio is then used to calculate the throughput of the first channel.

Throughput estimation method and system

Disclosed is a technology for easy balancing between cells by securing a cell balance, using an optimization process adopting a radio parameter as a parameter of an objective function. Objective function extractorsets up optimizing condition at least including an objective function that has a radio parameter of a base station as the objective function parameter and is used for an optimization process to balance traffic loads between cells, using cell balance values between a target cell whose characteristic changes by modification of the parameter and neighboring cells existing around the target cell. Optimizerperforms an optimization process in accordance with the optimizing condition set by objective function extractorto determine the value of the parameter to be the solution.

Radio network designing apparatus and method

The present invention is directed toward realizing a radio parameter determination method for improving values indicating the communication service quality of important areas in a radio communication system. The configuration of the present invention includes: a second step for determining a second radio parameter based on the first radio parameter and the weighted sum of values indicating communication service quality in, as regards the areas in which a plurality of radio base stations are arranged, a first area and second area to which first weighting values have been conferred; a third step for accepting a limitation condition related to the weighted sum; and a fourth step for determining a third radio parameter based on the limitation condition accepted in the third step, the weighted sum of the value indicating service quality of the first area and second area to which second weighting values that differ from the first weighting values have been conferred, and the second radio parameter.

Radio parameter determination method and device for a radio communication system

A wireless network change support system includes a change setting section, an income prediction section and an expense calculation section. The change setting section sets a change data for changing a setting data based on a status data indicating a status of a wireless network with wireless base stations and said setting data indicating a setting of said wireless network. The income prediction section calculates a prediction income in said wireless network when said setting data is changed, based on said status data, said setting data and said change data. The expense calculation section calculates a prediction expense necessary to execute a change of said wireless network as indicated in said change data based on said change data. The wireless network change support system may further includes an income and expenditure calculation section which calculates a profit of said wireless network when said setting data is changed on the basis of said changing data, based on said prediction income and said prediction expense.

Wireless network modification support system and radio network modification support method

A system is provided for estimating the geographical distribution of user throughput in a cellular system, including user terminals and a base station for effecting wireless packet communications with user terminals inside in its own cell using a shared channel. Reception quality estimating means () estimates the reception quality of the shared channel at the location of a user terminal in the cell. Traffic information reading means () reads the traffic information on the estimation target area in which estimation of the reception quality was performed. User throughput estimating means () estimates the user throughput at the location of a user terminal in the cell, using the user throughput calculating function that receives as its input the reception quality of the shared channel at the location of the user terminal in the cell and the traffic information on the estimation target area and calculates user throughput.

User throughput geographical distribution estimating system and user throughput geographical distribution estimating method

A wireless communication network can reliably deliver high priority broadcast information from base stations to mobile terminals located deep in building and those located in scarcely populated areas that are remote from the base stations. Each of the base stations of the wireless communication network comprises a broadcast information input unit for receiving high priority broadcast information and a transmission power changing unit for changing the transmission power of the downlink common channel when high priority broadcast information is input to it. As broadcast information is input, the transmission power changing unit changes the transmission power of the downlink common channel so as to boost the effective radiation power used by the downlink common channel of the base station at places in the coverage of the base station that are subjected to a propagation loss. The effective radiation power to the mobile terminals located at places in the coverage of the base station that are subjected to propagation loss is boosted to raise the reception level of the mobile terminals located at such places.

Wireless communication network and method for broadcasting high priority information using downlink common channels

A switching circuit () is controlled by an in-slot interface-noise-power-control output circuit () to output an in-slot interface noise power (-) to a past-slot interference-noise-power memory (), if there is no estimated value for an interference noise power of finger n of one slot before. If the interference noise power of the one slot before is not estimated and yet there exists an interference noise power which has been once estimated, the past-slot interference-noise-power memory () stores therein an interference noise power in a last slot which has been valid. An inter-slot averaging processing is performed between the interference noise power (-) from the past-slot interference-noise-power memory () and an estimated value (-) for the interference noise power in the current slot.

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Tokyo, Japan

Akio Aoyama