Kokusai Denshin Denwa Kabushiki Kaisha

Kokusai Denshin Denwa Co., Ltd.

Telefonaktiebolaget Lm Ericsson (publ)

Masanobu Fujioka

Yoshikazu Ikeda

Nobuo Furuya

Seiichi Yamamoto

Katsuyuki Utaka

Jun Matsumoto

Hiromichi Mori

Shingo Kuroiwa

Shin-ichi Sakayori

Atsushi Ito

Fumio Watanabe

Katsuyuki Yamazaki

Toshikane Oda

Hajime Nakamura

Masaki Naito

Hikaru Yagi

Hiroyuki Kikuta

Nagao Ogino

To reduce change on a cellular network side required at the time of utilizing a cellular network by way of an IP network. A radio terminalputs a location registration message for a cellular networkon an IP packet, and sends the message to an access point. This IP packet is transferred to a control proxy server. The control proxy serverstores a correspondence between identification information on a radio terminal and an IP address based on a location registration request. If necessary, the location registration request is converted into the location registration message in compliance with a standard of the cellular network. The location registration message is transferred to an MSC/VLRvia a gateway. As the gatewaylooks like an ordinary base station to the MSC/VLRand an ordinary location registration message is usable, any change on the cellular network side is not necessary.

Radio terminal, radio terminal controlling apparatus and location registration auxiliary apparatus

This invention is characterized by providing an apparatus for automatically discriminating service users which can prevent troubles from occurring between the service provider and users because of difference in language. When the service provider has a call from a user, the service provider makes an announcement to the user to request the voicing of a specific keyword. If an answer by the keyword is made from the user, it is determined whether or not it is an answer by the correct keyword. If correct, the call is connected to the service provider. If not correct, how to use the service is announced in another language. Then, the line is disconnected. As a result, a user who is weak in the language used by the service provider can be prevented from being connected to the service provider.

Apparatus and method for automatically determining whether a telephone

A telephone speech recognition system is provided which has a high level of speech recognition without affecting from various conditions of a telephone line. The system comprises speech analyzers (4) and (5), and reference speech model storages (7) to (9) corresponding to line connection data. A telephone line interface (1) having a line connection data acquisition function analyzes a call received from the telephone line for identifying the country, route, and other information of the call and transmits those line connection data to a line connection data processor (2). The line connection data processor (2) selects one of the acoustic analyzers (4) and (5) in response to the line connection data from the interface (1) and also one of the speech model storages (7) to (9). A speech pattern matcher (11) compares an acoustic vector train output of the selected acoustic analyzer with the speech models given from the selected reference speech model storage for speech recognition.

Telephone speech recognition system

An ISDN-user-network interface system comprising an interface buffer and an interface adapter. The interface buffer provided between an ISDN network terminal equipment and a terminal equipment to receive an up-signal frame transmitted from said terminal equipment to said network terminal equipment, to store said up-signal frame, and to transmit said stored up-signal frame at a timing when said network terminal equipment is capable of detecting the synchronization of said up-signal frame. The interface adapter provided between said ISDN network terminal equipment and said terminal equipment, to receive an up-signal frame transmitted from said terminal equipment to said network terminal equipment, to detect D-channel bits of said up-signal frame, to transmit said up-signal frame to said network terminal equipment, to copy said detected D-channel bits into echo channel bits of a down-signal frame from said net-work terminal equipment to said terminal equipment received immediately after the transmission of said up-signal frame, and to transmit said down-signal frame to said terminal equipment.

ISDN user-network interface system

A service processing system has a plurality of service processing nodes each having a single local data base, and a plurality of exchanges each of which is coupled user terminals. Said service processing nodes are coupled with one another through communication lines. A query by a user terminal is transferred to a local data base through an exchange to which the user terminal belongs. When a response to the query is stored in that data base, said response is directly given to the exchange from said local data base. On the other hand, when the local data base does not store the response the query of the user terminal is transferred to another service processing node which is designated by the local data base through the communication line between the service processing nodes. The response obtained in said other service processing node returns to the first local service processing node. Thus, the service to a user terminal is carried out by using a plurality of distributed data bases, each of which stores only local data.

Service processing system with distributed data bases

An ATM (asynchronous transfer mode) exchange system for high speed packet exchange with a fixed length packet is implemented by a plurality of cell handlers (10-1 through 10-n) each related to each ATM channel, and a plurality of buses coupled with the cell handlers. An input user cell is subject to add routing information including an output cell handler number (403) and an output virtual channel identifier (404) by a virtual channel converter (12) and a routing header adder (13). The user cell which has routing information is forwarded to the bus. The cell on the bus is read out by all the cell handlers, and the particular cell handler in which the number of cell handlers coincide with the cell handler number in routing information takes the cell on the bus. In the cell handler, the cell itself read out of the bus is stored in the cell buffer memory (16), and the address of the cell buffer memory (16) of the cell is stored in the queue buffer (18). When an output channel is available, the cell is forwarded to the output channel from the cell buffer memory (16) based upon the address of the cell stored in the queue buffer (18). A plurality of queue buffers may be provided for delay time control. Congestion control is possible for loss control of a cell when an output channel is congested, based upon the number of cells waiting in the queue buffer.

ATM exchange system

A light triggering switch is disclosed for switching the optical path of an input optical signal to a desired output optical path. A portion of an optical control signal of a predetermined wavelength is branched by a branching filter. An electrically-controlled optical switch is provided for converting the branched optical control signal into an electrical signal and for switching the optical signal to the desired output optical path in accordance with the intensity of the converted electrical signal. In place of the electrically-controlled optical switch, a nonlinear reflector type optical switch may be provided for switching the optical signal to the desired output optical path in accordance with the intensity of the branched optical control signal.

Light triggering switch

In a communication system which handles both a demand call, and a reservation call which appoints the start time and the end time of the communication, the reservation call must be connected at the desired time even if the circuits are full of the demand calls. The service process node which has a data base storing the information of the reservation calls, tries to connect the reservation call repetitively until the scheduled end time of the reservation call in every predetermined pause, if the circuits are full of the demand calls. Also, when it is anticipated that the circuits would be full at the desired time, the service process node suggests to the subscriber the alternative time for reservation.

Quasi reservation-based communication service process system

An optical packet switching system is disclosed in which a routing signal is composed of a wavelength-multiplexed optical signal and an information part and a packet end code are also composed of optical signals. In accordance with the present invention, a switching network is formed by a multi-stage combination of light triggering switches which are closed depending on the presence or absence of a particular wavelength in the wavelength-multiplexed optical signal.

Optical packet switching system using multi-stage combination of light

A terminal in communication network for notifying an originating party's number is disclosed which transfers the subscriber's number of an originating party to a terminating party at the time of setting up an incoming call. A plurality of subscriber's numbers of those from whom incoming calls are anticipated and ID information corresponding to each of the subscriber's number are pre-registered. An output command indicating that one of the registered subscriber's number has coincided with the subscriber's number of an originating party transferred at the time of occurrence of the incoming call is generated. In response to the output command, an audible indication of the ID information corresponding to the registered subscriber's number is provided.

Terminal in communication network for notifying originating party's

A local communication system among ISDN terminal equipment in a user's premises are connected to a local passive bus of the LSDN basic-access interface. The present system can establish the local communication through a network termination unit among ISDN termination equipment. In order to establish such a local communication, a multiframing scheme is taken on a passive bus forming multiframes by combining together the predetermined number of frames which are as defined in the I.400 series of CCITT recommendations. The network termination unit has a switching device for coupling two circuit-switched type communication channels (B1, B2) on the passive bus in one direction of transmission with the two other channels (B2, B1) in the other direction to establish local communication. Alternatively, the switching device couples the two channels on the passive bus with those on the subscribed line to establish external communication. Each of the terminal equipments has a device for requesting the local communication when required.

Local communication system among ISDN terminal equipments

The ISDN user-network interface is defined in the CCITT D-channel protocol recommendation (I-400 series recommendations), in which many kinds of communication terminals (e.g. faximile, telephone, teletex, etc.) can communicate through a subscriber line. The user-network interface is improved from the view point of effectiveness of terminal usage, provision of communication service, and, flexibility of system configuration, by providing a control terminal in the subscriber. The control terminal doubles as ordinary terminal equipment, and has a global control function for controlling other subscriber terminal equipment. The control terminal establishes and/or releases a local control phase in which a control terminal controls ordinary terminal equipment in the same subscriber to have them correspond to the communication with another subscriber using the means which belong to the ordinary terminal equipment inherently. The control terminal operates as an ordinary terminal apparatus when it is not in local control phase.

ISDN subscriber terminal control system

In a packet switching system of the present invention, a packet handler is facilitated for each incoming circuit to the switching system. The packet handler analyzes the header of each incoming packet from the correspondent circuit and decides the outgoing route of the packet. The packet is then sent out to an outgoing circuit of the decided route, the rest of it including the data field not being stored in the switching system, through a conventional cross-point switch for circuit-switching. Thus, elimination of storing the whole packet raises the efficiency of packet processing and shortens the processing delay. The use of a cross-point switch enables the functional sharing of the system by circuit-switched calls and packet-switched calls.

Packet switching system

A distributed switching system is disclosed which includes a plurality of simple-function switching units interconnected by speech path links, each unit having a speech-path switch, a plurality of processing units connected to speech-paths for use in signal and call processing, and an inter-unit bus for the connection between the switching units and the processing units, and functions as a single large switching system as a whole.

Distributed switching system

A speech path switching system in time-divisional electronic telephone switching system for the full availably switching between k number of incoming highways and k number of outgoing highways and each highway having n number of telephone channels comprises (a) k number of speech path memories for temporarily storing telephone signals, provided for each incoming highway, (b) k number of input counters provided for each speech path memory for designating the input address of said speech path memory, said input counter being circularly incremented synchronized with the frame phase of the corresponding incoming highway, (c) k number of holding memories provided for each outgoing highway for designating the read out address of said speech path memory to substantially connect an incoming channel to an outgoing channel, and (d) k number of output counters provided for each holding memory for designating the read out address of the holding memory.

Growing community of inventors

Saitama, Japan

Masanobu Fujioka