Nec Corporation

Nec Access Technica, Ltd.

Nec Platforms, Ltd.

Masahiko Yahagi

Tsukasa Okamoto

Hideyuki Katayama

Kazuko Ohkubo

Junichi Owada

Satoru Kaneda

Toshiya Tsuji

Toshio Nitta

Hiroya Endo

Kousaku Fujita

Yoshiaki Ohno

Ryoichi Egusa

A broadcast apparatus transmits data of programs. A broadcast control apparatus measures the extent of viewing requests from users of terminals as scores for programs that are transmitted from the broadcast apparatus, and based on the scores that were measured, determines the service quality that is used in the broadcast of the programs. A communication access network apparatus, upon determination of the service quality of programs by the broadcast control apparatus, broadcasts data of programs that are received from the broadcast apparatus by communication channels having a transmission rate that corresponds to the service quality.

Broadcast system, broadcast control apparatus, and broadcast method

A communication terminal acquires positional information indicating the position at which the communication terminal exists, from a GPS satellite, determines a range of correspondence information to be acquired, from among the correspondence information that makes the positional information indicating position identified by latitude and longitude correspondent to the frequency to be used at that position and that is stored in a server, based on the acquired positional information, acquires the correspondence information included in the determined range, from the sever, and, identifies the frequency to be used between the communication terminal and the radio base station to be connected to the communication terminal, based on the acquired positional information and the correspondence information included in the range.

Access method for communication terminal

Time information and positional information indicating the position at which a communication terminal is present are acquired from a GPS satellite, and, based on the acquired positional information and correspondence information which provides the association correspondence between the positional information indicating a position identified by latitude and longitude and the timing of a synchronizing signal for establishing synchronization at the position, the timing of the synchronizing signal for establishing synchronization between the communication terminal and the radio base station is identified.

Timing of synchronizing signal

A wireless communication system includes a plurality of base stations that can switch to either first or second communication method and that communicates wirelessly with terminals by the switched communication method and a control apparatus that manages the plurality of base stations. The control apparatus includes: an acquisition unit that acquires, from each base station, throughput of the base station and RSSI of each terminal that communicates wirelessly with the base station; and a switch instruction unit that instructs to each base station switch the current communication method when there is, among the plurality of base stations, a base station in which throughput has decreased within fixed interval, and instructs to re-switch to the communication method before switching to base stations in which throughput before and after switching of communication method is same but a specific standard, based on RSSI after switching of communication method, is not satisfied.

Wireless communication system, control apparatus, communication method switching method, and program

Provided is a broadcast system that assigns a communication channel to a program and broadcasts data for the program to terminals, the broadcast system including a broadcast management device and a communication access network device. The management device calculates as a score a measure of viewing requests from users of the terminals for a plurality of programs, and determines a program to actually broadcast on the communication channel based on the score. The communication access network device transmits program data on a communication channel according to the determination of the broadcast management device.

Broadcast system, broadcast management device, broadcast method, and terminal

A wireless communication system includes a plurality of base stations that are capable of switching to either a first communication method or a second communication method and that carry out wireless communication with terminals by the switched communication method and a control apparatus that manages the plurality of base stations. The control apparatus includes an acquisition unit that acquires information of throughput of each of the plurality of base stations and a switching instruction unit that instructs switching of the current communication method to each of the plurality of base stations when there is a base station in which throughput drops within a fixed interval among the plurality of base stations, and that further instructs re-switching to the communication method that preceded switching to base stations in which throughput dropped from before to after switching communication method among the plurality of base stations.

A wireless communication system includes a first communication apparatus that uses first frequency band to communicate wirelessly by time division method, a second communication apparatus that uses second frequency band adjacent to the first frequency band to communicate wirelessly by time division method, and a router apparatus that relays data communicated wirelessly in the first and second communication apparatus. The router apparatus includes a first communication unit that uses the first frequency band to communicate wirelessly by time division method with the first communication apparatus, a second communication unit that uses the second frequency band to communicate wirelessly by time division method with the second communication apparatus simultaneously with wireless communication by the first communication unit, and a controller that causes transmission intervals and reception intervals in the second communication unit to coincide with transmission intervals and reception intervals that are partitioned by time divisions in the first communication unit.

Wireless communication system, router apparatus, wireless communication method, and program

A method according to the present invention comprises determining an available information rate for communication, via a first base station, between a plurality of terminals and a second base station based on link capacity information for wireless communication between the first base station and the second base station, and controlling each of information rates for the communication between the plurality of terminals and the second base station based on the available information rate. Here, the plurality of terminals and the first base station being in a mobile object, the second base station being outside the mobile object.

Mobile communication system, mobile terminal, base station, radio network controller, information rate control method therefor and program therefor

Disclosed is a mobile communications system including a plurality of base station apparatuses which are located at geographically dispersed locations and perform a wireless communication with a mobile device. The system further includes a maximum ratio combining unit which performs maximum ratio combining processing regarding a signal the base station apparatuses receive from the mobile device, and a selection combining unit which performs selection combining processing regarding the signal from the mobile device. A selection unit included in the system selects one or both of the maximum ratio combining unit and the selection combining unit according to at least one of an external factor and a change of a distribution state of the mobile device under communication.

Mobile communications system and control method thereof

The present invention provides a communication restriction control system and a communication restriction control method capable of performing communication restriction control depending on circumstances of communication restriction control area. The mobile terminal transmits a response request signal to a radio response equipment provided in the communication restriction control area which transmits a response signal including identification information as a response to the response request signal. A communication system discriminating equipment which is provided with a database in which the identification information is associated with one of allowed communication circumstances, and allowed communication circumstance is determined by referring to the database according to the identification information, and communication restriction control of the mobile terminal according to the determined result is performed.

Communication restriction control system and communication restriction control method

Mobile terminalstomeasure strength of the received signal from plurality of base station antennastoand transmits it to network system. Network systemdetermines proximity state between plurality of base station antennastobased on the strength of the received signal from plurality of base station antennastotransmitted from mobile terminalsto. From that determination, the base station antennas proximity state matching a position or features of an antenna of the mobile terminal can be recognized.

Mobile communication system and method for determining base station antenna proximity state

A content distribution system uses a PtP (point to point) channel (individual channel) or PtM (point to multi-point) channel (common channel) as a radio channel of a predetermined type so as to distribute a broadcast content as communication data to a user terminal as a mobile station. The user terminal receives the same content distributed from a broadcast content server by the PtP channel. Here, if the total of the downlink transmission power of the PtP channel is greater than the downlink transmission power of the PtM channel when the content is distributed to the user terminal by the single PtM channel, a base station or a base station control device judges that the radio channel is to be switched from the PtP channel to the PtM channel. Similar judgment is made when switching from the PtM channel to the PtP channel is performed. Thus, it is possible to switch the radio channel type used for the broadcast-type service without lowering the use effect of the radio resources.

Content distribution system, network, and channel switching control method

In a mobile communication network, the foreign agent function of a mobile terminal that makes a small number of moves is placed in a radio base station, and the foreign agent function of a mobile terminal that makes a large number of moves is placed in a first node setting and managing a radio access link with a mobile terminal connected through a radio base station, thereby preventing concentration of foreign agent functions on the first node. When a mobile terminal (MN) detects a move to a foreign link to be connected, it acquires a new c/o address and transmits a binding update request to which a communication party list is attached to a home agent. The home agent transmits a binding update request to report a pair of the new c/o address and the home address of the mobile terminal to the communication parties in the communication party list.

Growing community of inventors

Tokyo, Japan

Masahiko Yahagi