Ntt Docomo, Inc.

Nagoya Institute of Technology

Motonari Kobayashi

Toshihiro Suzuki

Ichiro Okajima

Hiroshi Kawakami

Tomohiro Nagata

Ashiq Khan

Manhee Jo

Daisuke Ochi

Yuki Oyabu

Masayuki Terada

Masanori Morita

Wataru Takita

Ratapon Satrusajang

Naohisa Takahashi

Yoshiaki Katayama

Koichi Wada

A number-of-terminals estimation device has a unit to acquire location data; a unit to acquire location acquisition time information of second location data immediately preceding the first location data and third location data immediately following the first location data, from location data including the same identification information; a unit to calculate a feature amount of the first location data, based on at least two of the location acquisition time information of the first to third location data; a unit to acquire observation target location data including location acquisition time information after an observation start time and before an observation end time and including location information corresponding to observation area information; and a unit to estimate the number of terminals located in the observation area during the observation period, based on feature amounts of the observation target location data and the length of the observation period.

Number of terminal estimation device and number of terminal estimation method

A position information aggregation device includes a position information receiving unit receives position information related to the positions of a plurality of mobile communication terminals together with a user ID specifying a user of the terminal corresponding to each position information and an address code of the user, an acquisition rate calculating unit that calculates a position information acquisition rate of each address code of the plurality of terminals using population statistics data and position information of each narrow area in a predetermined broad area, and an aggregating unit that aggregates a population distribution in a certain area by extracting the position information corresponding to the certain area based on the position information received by the position information receiving unit and aggregating the position information in which the position information acquisition rate corresponding to the address code included in the position information is reflected.

Position information aggregation device and position information aggregation method

A mobile station, a communication system, and a communication method that are capable of efficiently collecting location information of any user. A communicating module receives a positioning request including attribute specifying information from a management center, a determining module determines whether measurements of the location are necessary or not based on the attribute specifying information in the received positioning request and the attribute information stored in advance. Then, when the determining module determines that measurements of the location are necessary, a positioning module performs measurements of the location and sends location information thus measured to the management center. Accordingly, it is possible to collect the location information of the mobile station that agrees with an attribute that the management center desires and therefore, it is possible to provide an attentive service and the like based on the location information.

Mobile station, communication system, and communication method for collecting location information of a mobile station

A communication system aimed at easily and quickly collecting data regarding macroscopic population distribution, and easily and quickly obtaining survey results. An RNC of a communication system includes a signal-counting module that counts the number of signals indicating a quantity of signals transmitted and received between a mobile station and a BTS. An information analysis device includes a population distribution calculation module that calculates population distribution based on the number of the signals that the signal-counting module counts, and an output module that outputs the population distribution that the population distribution calculation module calculates.

Communication system, information analysis device, and information analysis method

A household member number distribution estimation apparatus of the present invention includes a subscriber information acquisition unit that acquires subscriber information that is information regarding subscribers of mobile terminals of a specific carrier in a region within a predetermined range and with which user IDs and main line numbers of the mobile terminals are associated, a household terminal number extraction unit that, by referring to the subscriber information, extracts the number of household terminals that is the number of the mobile terminals for each main line number, a household number extraction unit that extracts the number of households per number of terminals, and a household number estimation unit that, by using a terminal subscription rate in the region within the predetermined range to correct the number of households per number of terminals, estimates the number of households per number of household members that is the number of households for each of the number of household members constituting a household. Thus, the household member number distribution estimation apparatus enables to obtain the number of households for each of the number of household members with high accuracy on the basis of easily obtainable data.

Household member number distribution estimation apparatus and household member number distribution estimation method

Provided is a mesh data creation method allowing appropriate expression of population densities while making a balance between accuracy and granularity. In the mesh data creation method, when the number of samples in a region of reference mesh data with a predetermined size is not less than a threshold, divided mesh data is created by dividing the region of the reference mesh data. Namely, each portion with a high population density can be expressed by a fine region of mesh data and each portion with a low population density by a coarse region of mesh data. The above makes it feasible to prevent meshes from becoming too fine to ensure accuracy or, conversely, from becoming too coarse to maintain granularity, thereby resulting in failing to achieve a detailed grasp of population densities, and thus to achieve appropriate expression of population densities while making a balance between accuracy and granularity.

Mesh data creation method

For easily and quickly collecting data regarding macroscopic population distribution, and easily and quickly obtaining the survey results, an RNC includes: a location registration signal receiver that receives location registration signals, and a signal number counting module that counts the number of the location registration signals for each sector, and an information analyzing apparatus includes: a population distribution calculation module that calculates population distribution information based on the number of the location registration signals; and an output module that outputs the population distribution information.

Communication system, information analyzing apparatus and information analyzing method

In a wireless communication terminal, the other terminal existence confirmation section broadcasts a confirmation message at fixed intervals and receives a response message. The topology information management section computes the topology of the whole network to which the wireless communication terminal itself belongs, on the basis of the topology information on the network received at fixed intervals from other terminals. The path management section derives an optimum path to the terminal of the transmission destination. The QoS information collection section issues a communication start request instruction and, when a QoS information collect request instruction has been issued, unicasts a QoS request packet on the path and receives a reply QoS request packet. The judgment section adopts the path as the communication path when QoS information satisfies a predetermined quality standard.

Wireless communication terminal and QoS information collection method

A data join system of the present invention includes a table determination unitselecting a record b as a join target if a value of a key item included in a record a acquired by a data write unit from a table A falls within a first predetermined range set based on a value of a key item included in the record b stored in a table B, a data join unit joining the selected record b with the record a to generate a record c, and a data write unit storing the record c into a table C. Thus, the success rate of data join can be improved while the accuracy of join of the record b and the record a to be joined is improved.

Data combination system and data combination method

A controller apparatus is configured to control an ad hoc network formed by a plurality of mobile terminals. The controller apparatus includes a transmission power determining unit configured to determine transmission power of a certain mobile terminal joining in the ad hoc network, based on traffic distribution in the ad hoc network.

Controller apparatus, mobile terminal, and communication control method

A controller apparatus of this invention controls transmission of a packet from a source mobile terminal to a destination mobile terminal through one or more relay mobile terminals in an ad hoc network formed by a plurality of mobile terminals. The controller apparatus includes a packet location information managing unit configured to manage packet location information which shows to which mobile terminal the packet has been transmitted in the ad hoc network.

A controller apparatus of this invention includes a topology information managing unit configured to manage topology information showing a topology, a location information acquiring unit configured to acquire location information on a plurality of mobile terminals, a link information acquiring unit configured to acquire link information at the mobile terminals, a determining unit configured to determine a way to change the topology, based on the location information, the link information and the topology information, and a transmitting unit configured to generate instruction information for changing the topology, based on the determined way to change the topology, and to transmit the instruction information to a certain mobile terminal.

Controller apparatus, mobile terminal, and communication control method for changing topology

A mobile terminal configured to constitute an ad hoc network together with a plurality of other terminals, the mobile terminal includes a packet relay unit configured to execute a relay operation of relaying a packet transferred between the other terminals. A packet transmitter is configured to execute a transmission operation of transmitting a packet generated in the mobile terminal to any one of the other terminals. A power supply manager is configured to execute a power supply control operation. A coordination controller is configured to cause the relay operation and the power supply control operation to be coordinated with each other, and to selectively control whether each of the relay operation, the transmission operation and the power supply control operation is executed.

Mobile terminal, wireless communications system and mobile terminal control method

A mobile communication system transfers a packet to a mobile communication terminal forming an adhoc network, through a core network, based on address information of the mobile communication terminal. The address information of the mobile communication terminal includes common information which is changed when a connection point between the adhoc network and the core network is changed, and individual information which is maintained unchanged even when the connection point between the adhoc network and the core network is changed. The packet is configured to be transferred based on the individual information in a communication within the adhoc network.

Mobile communication system and mobile communication terminal

A mobile terminal device that forms an adhoc network comprises a clustering section that identifies the ID and state of a mobile terminal device that is adjacent to the mobile terminal device itself by exchanging a Hello packet (containing the ID and state of the mobile terminal device itself) with the other mobile terminal device and which, based on the state of the adjacent mobile terminal device and the state of the mobile terminal device itself, sets the state of the mobile terminal device itself as a cluster head, gateway, or member; a storage section that stores the ID and state of the adjacent mobile terminal device and the state of the mobile terminal device itself; a link information transmit/receive section which, when the state of the mobile terminal device itself is the cluster head, transmits link information containing the ID of the adjacent mobile terminal device and the ID of the mobile terminal device itself and receives link information from the other mobile terminal device; and a routing section that finds a route to any mobile terminal device on the basis of the link information thus transmitted and received.

Growing community of inventors

Yokohama, Japan

Motonari Kobayashi