Fujitsu Corporation

Yasuo Tezuka

Masanori Hashimoto

Kayo Motohashi

Nao Miyazaki

Hideo Abe

Hidekazu Kuniyoshi

Akio Yaba

Takashi Kanda

Tetsuo Yamaguchi

Satoshi Maruyama

Tadanori Yokosawa

Yuichiro Chikamatsu

Takeshi Harada

Yuichirou Chikamatsu

Ryuji Ishikawa

Masataka Sakata

A base station controller that manages a plurality of cells includes a receiving part configured to receive, from another base station controller that manages a cell sharing a communication area with each of the plurality of cells, identification information of a cell group to which a cell formed by a base station of connection destination candidate of a mobile station connected to a base station under control of the another base station controller belongs, and a control part configured to exercise control to transmit a message requesting connection to the mobile station to each base station forming the cells contained in the cell group.

Base station controller, base station and communication method

A mobile communication system has a plurality of nodes, hierarchically connected to each other, including a source base station and a target base station. A U-plane management station includes detecting unit detecting a handover for the mobile terminal, and a Bi-casting unit redundantly transmitting, when detecting the handover for the mobile terminal, the same user data addressed to the mobile terminal toward both of the source base station and the target base station. The target base station includes a retaining unit receiving the user data addressed to the mobile terminal, which is transmitted by the U-plane management station, and retaining the user data, and a wireless transmitting unit wirelessly transmitting, when the mobile terminal is wirelessly connected after moving, the user data requested by the mobile terminal in the user data retained by the retaining unit and addressed to the mobile terminal.

Mobile communication system

A plurality of base transceiver stations and at least one extension device are connected, via an IP network that uses internet protocol. The extension device shares resources of the base transceiver stations by arbitrary changing a connection relationship between the base transceiver stations and the extension devices. When a mobile terminal communicates with a core network, the extension device uses the resources of at least one base transceiver stations according to fluctuation in the amount of traffic.

Radio communication system, base transceiver station, and extension device

In a network system including a radio base station to be accommodated in a mobile telephone network through an IP network, the radio base station, when receiving a calling request from a calling terminal, specifies a called terminal of the calling request. If the called terminal can receive the calling request by using another radio base station different from the base station connected to the IP network, it is tried to establish a data communication line, in which the radio base station and the another radio base station are connected through the IP network not by way of the mobile telephone network, so as to exchange the communication data between the calling terminal and the called terminal.

Data transmission line establishing system between mobile telephone terminals

In a network system including base stations accommodated in a mobile phone network through an IP network, when a mobile phone terminal as a calling terminal makes a calling request and the calling request from the calling terminal is sent through a source base station to the mobile phone network and then from the mobile phone network through a destination base station to a mobile phone terminal as a called terminal, it is judged whether the source base station and the destination base station are both connected to the mobile phone network through the same IP network, and when the source base station and the destination base station are both connected to the mobile phone network through the same IP network, a data transmission path is established between the calling terminal and the called terminal that directly connects the source base station and the destination base station through the same IP network and without via the mobile phone network.

System for establishing data transmission path between mobile phone terminals

When a terminal enters a cell of a personal-use base station (NBTS) arranged in a certain location area, the terminal receives a location area identifier having a number that is different from an identifier of the location area, and transmits a location updating request with the reception of the location area identifier as a trigger. On receiving the location updating request, a VLR or an NRNC having a registration table, in which the ID of the personal-use base station and the ID of a terminal allowed to use the personal-use base station are registered, judges whether the terminal issued the location updating request is the terminal allowed to use the personal-use base station by referring to the registration table. If the terminal issued the location updating request corresponds to the terminal allowed to use the personal-use base station, the terminal is placed under a status where it is capable of performing communication in the cell, and if not, the terminal is placed under a status where it is incapable of performing communication in the cell.

Terminal state control system

A system according to this invention executes congestion control for monitoring a packet flow which passes through a relay router in a VoIP network and in which a packet is transferred with a predetermined priority, and for, when congestion is generated by generation of a new packet flow, maintaining a transfer state of a packet of a packet flow established before the new packet flow is generated and transferred with the predetermined priority.

Congestion control system for VoIP network

This invention relates to an IP processor, and more particularly, provides an IP processor that reduces network load when a plurality of IP processors connected to ATM switches are used in edge portion of an IP network. The IP processor is comprised of a line interface unit for interfacing with an ATM switch, an IP packet buffer unit for temporarily storing an IP packet from the line interface unit, and sending out the IP packet after address resolution to the line interface unit, and an IP address resolution unit that responds to address resolution request from the IP packet buffer unit and returns the destination address information after address resolution, wherein the IP packet buffer unit sends out, when destination address information cannot be retrieved from the IP address resolution unit, the temporarily stored IP packet to a transfer route for direct transfer between IP processors.

IP processor

A buffer control device for controlling a buffer memory includes a comparing unit which compares input data with one or more data patterns, a control unit which stores a code which indicates a data pattern among data patterns into said buffer memory if the input data matches with the data pattern, and a recovering unit which recovers the input data from the code.

Buffer control method and buffer control device

The present invention provides a packet transfer system for use in an ATM network, which can realize a high-speed packet transfer by implementing a packet transfer process by hardware and also can enhance the throughput of the packet transfer process implemented by software. This packet transfer system comprises a hardware processing portion, which a memory, a packet assembling portion for causing the memory to store a packet assembled from an ATM cell received from a main circuit or an expansion circuit, a higher layer processing portion for performing higher layer processing portion according to header information sent from the packet assembling portion, and a packet determining/transmitting portion for transmitting a packet, which is determined according to a result of the higher layer processing in the higher layer processing portion as required to undergo packet processing, to an expansion circuit and for transmitting a packet, which is determined according to the result of the higher layer processing as not required to undergo packet processing, in a form of an ATM cell to a main circuit. The packet transfer system may further comprises a software processing portion, which has a second memory, a cell assembling/disassembling portion for assembling the ATM cell received from the expansion circuit into a packet, for causing the second memory to store the assembled packet, for reading the packet stored in the second memory and for transmitting the read packet in the form of an ATM cell to the expansion circuit, a packet processing portion for performing packet processing on a packet, which is received in the second memory, by software.

Packet transfer system

A packet buffer device and a packet assembling method in a packet transfer module to assemble logical channel-multiplexed asynchronous transfer mode (ATM) cells into packets and to store and output the cells in packet units. The packet buffer device includes a discrete buffer controller to generate a discrete buffer from a common buffer, a buffer type determination unit to determine a buffer type in which to store an ATM cell for each input ATM cell, and a packet buffer controller to assign the ATM cell to the common buffer or to the discrete buffer according to the buffer type. Thus, a common buffer and discrete buffers are dynamically constructed and buffers of respectively differing type can be used for packets of differing service mode. Further, optimal buffer resource usage can be achieved by using the buffer capacity of both a common buffer type and a discrete buffer type to store packets.

Packet buffer device and packet assembling method

A communication unit which transmits packets in the form of ATM cells, includes a packet buffer part receiving Virtual Channel (VC)-multiplexed ATM cells from an input line, judging a packet type, converting a header and assembling a packet, a protocol processing part receiving and processing a protocol packet output from the packet buffer part when the packet type of the packet assembled in the packet buffer part is the protocol packet which is used for communication control, and a packet output scheduling part, including a scheduler which carries out an arbitration when an output request generated upon completion of a reception of a user packet from the packet buffer part and an output request generated upon ending of a process from the protocol processing part are received, and selects and outputs to an output line the user packet or the protocol packet based on the arbitration.

Growing community of inventors

Kawasaki, Japan

Yasuo Tezuka