Nec Corporation

Hidehiro Matsumoto

Yushi Niwa

Hiroaki Ueda

Hiroyuki Ishikawa

Tsuneyuki Kikuchi

A program control system is capable of preventing an invalid program from being downloaded to a mobile terminal. When a programmer applies for the certification and registration of a developed program, a gateway sends a checking program for checking the validity of program to the programmer. After having been notified that the program had passed the check from the programmer, the gateway accepts the registration of the program, and requests a cipher key database to send a public key. Having received the public key from the cipher key database, the gateway sends the program with the public key to a server to register the program. When a mobile terminal requests for the program, the gateway accesses the server to obtain the program with the public key. Subsequently, the gateway sends the public key to the cipher key database to authenticate the public key by use of a companion cipher key stored therein. The gateway downloads the program to the mobile terminal only when the public key is authenticated and thereby the program proves to be valid.

Program control system, program control method and information control program

A wireless communication system is provided which supplies an only necessary font to a wireless client and avoids incorrect display on the wireless client. A wireless communication gateway server receives language information from the wireless client, and supplies a required font to the wireless client. The font is determined based on the language information by using a user control server including user information database and a font server including a plurality of fonts.

Wireless communication system and method of changing language to be displayed in wireless client

For collecting market research data and promoting business activities in a selected geographic area, user information containing users' profile and preference information is received from a mobile terminal and a user identifier is assigned to the user of the mobile terminal, The assigned user identifier is mapped to the received user information in a first database, and the assigned user identifier is transmitted to the mobile terminal. A user identifier, when received from a mobile terminal, is checked for verification. If the received user identifier is verified, the user of this mobile terminal is allowed to transmit area-specific information that can obtained only when the user is in the selected geographic area. Corresponding to the verified user identifier, user information in the first database is detected and mapped to the received area-specific information in a second database. Data stored in the second database can be used for market research.

Method and system for collecting market research data from consumers

A mobile wireless communication system includes information, a portable terminal, a plurality of wireless communication gateway servers, a switching apparatus, and a wireless telephony server. The switching apparatus sets a connection between the portable terminal and a first wireless communication gateway server or another connection between the portable terminal and a second wireless communication gateway server when the first wireless communication gateway server is congested. The wireless telephony server informs a position of the portable terminal to the wireless communication gateway server.

Mobile wireless communication system carrying out communication of a portable terminal, an information source server apparatus and a wireless communication gateway server apparatus

A portable terminal provided with a text browser for perusing text contents which are supposed to be displayed on a display of the portable terminal, and a help browser for perusing help contents showing methods of utilizing the text contents. When a certain message is inputted from outside, it is determined whether the input message is a text message or a help message, according to which either the text browser or the help browser is activated. The help browser outputs the help contents through text, voice, static images, or moving images. The portable terminal sets each of a plurality of switch keys to an effective state or an ineffective state in accordance with the contents of the help contents. In setting certain switch keys to effective states, LEDs, etc. provided corresponding to those switch keys are lighted. When the rest of the switch keys are set to ineffective states and any operation by those switch keys are made ineffective, not only the operation by the user becomes simple, but also false operation can be prevented.

Portable terminal system, portable terminal, method of controlling portable terminal, and storage medium storing program for controlling portable terminal

A communication system of a network includes a server having a table in which clients and telephone numbers are stored in a paired relationship in advance, and the server refers to the table to originate a telephone call to an object client who, upon receiving a data information request, accesses the server. After the information data request is confirmed and the client disconnects a modem line temporarily, the client then originates a telephone call to the server to access the server and to accept communication data from the server.

Communication system for selectively connecting a server to numerous terminal units over a public network

A communication method for a wireless transmission network having a plurality of terminals and a central server, disclosed in the context of an E-mail system. The source terminal sends only a mail header identifying the message source, the destination and other attribute information to the server. The destination terminal receives the digital data directly from the source terminal when desired after first downloading the mail header from the server. Thus, a data recipient can reduce unnecessary communication cost and storage resources in the server and in the system, can be saved.

Wireless communication method permitting efficient use of system resources

A network system for mobile radio communication includes a network constituted by a server unit and a client unit, a radio connection unit connected to a communication network, a public radio base station installed in a cell, and a mobile radio terminal which establishes a radio channel with the public radio base station while moving. The network system performs data communication between the server unit and the mobile radio terminal. Each of the server unit and the mobile radio terminal includes a buffer memory and an auxiliary storage unit which hold data. The mobile radio terminal includes an electric field strength monitoring section for monitoring slot errors or a reduction in electric field strength, a section for storing data in the buffer memory during data transmission to the server unit when the level based on slot errors or a reduction in electric field strength is equal to or higher than a threshold for line switching, a section for sending a line switching notification to the server unit, a section for sending a line switching request to the public radio base station, and a section for starting to transmit the data stored in the buffer memory upon reception of a response indicating completion of line switching from the public radio base station.

Network system for mobile radio communication with line switching

A synchronous compression system for compressing input video data and audio data with establishing synchronization therebetween, comprises video data compressing circuit for compressing each of first to nth blocks where n is an integer greater than or equal to two in order of the first block to the nth block, audio data compressing circuit for compressing input audio data for one frame, interruption control circuit for controlling to interrupt video data compression when video data compression process is delayed with respect to audio data compression process with reference to frame numbers of those currently compressed in the video data compressing circuit and the audio data compressing circuit.

Synchronous compression and reconstruction system

A method for detecting a scene change in an input image data composed of a plurality of frames. First, a DC component for each of blocks into which each of the frames is divided is calculated by orthogonal transformation such as discrete cosine transformation. An absolute value of the difference between the DC component of a current frame and the DC component of a frame adjacent to the current frame is calculated for each block of the current frame. The number of blocks for which the absolute value exceeds a first threshold value Is then counted, and a scene change between tile current frame and the adjacent frame is detected when the number of the blocks is higher than a second threshold value.

Growing community of inventors

Tokyo, Japan

Hidehiro Matsumoto