Fujitsu Corporation

Kosuke Nobuyasu

Takeshi Tanaka

Kenji Tanaka

Tomonobu Takashima

Reiko Norizuki

Masanori Kajiwara

Hidetoshi Toyofuku

Hideki Mase

Tatsuru Nakagaki

Ryoichi Ishibashi

Atsushi Yamashita

Yoshiaki Kumagai

Toshio Irie

Toshiyuki Hijikata

Yoshinori Matsunaga

A radio base station in a CDMA mobile communication system for allocating radio channels to mobile stations at a plurality of different bit rates. The base station including a storage part for storing a maximum number of radio channels that makes a signal-to-interference noise power ratio for each channel greater than a predetermined value. The maximum number having a value which changes in steps depending on a bit rate used for a call presently made. A control part for reading the maximum value stored in the storage part and allocating radio channels to the mobile stations in a range that does not exceed the maximum value.

Radio base station for a CDMA mobile communication system

A cell multiplexing apparatus including call monitors and multiplexers. The call monitors monitor a plurality of channels for their call setting status and select at least two channels for which the same cell may be assembled, i.e., for which the destination of the calls is the same. The multiplexers receive audio information or information already assembled in asynchronous transfer mode (ATM) cells from the channels selected by the call monitors, and disassemble and multiplex the received information for assembly into the payload of a new ATM cell.

Cell multiplexing apparatus handling multiple items of information

The present invention aims at providing an ascending transmission speed controlling method and a communication system in an ATM-PON (asynchronous transfer mode-passive optical network), in which ascending transmission speeds on the PON are dynamically allocated corresponding to actual transmission states of communication channels of a best effort type, to thereby effectively utilize respective bands. To this end, according to the present invention, in an OLT (optical line termination) constituting the ATM-PON system, active/inactive states of communication channels are identified based on receiving states of ascending data cells transmitted from ONU's of subscriber side, respectively, and a congestion state of the ATM network is recognized by extracting B-RM (backward resource management) cells from descending data cells, respectively, transmitted from the ATM network, so that ascending transmission speeds on the PON are allocated to communication channels corresponding to service categories, based on such as the thus recognized information.

Ascending transmission speed controlling method and communication system in ATM-PON system

Disclosed is a soft handoff control method in a CDMA mobile telecommunications system in which, when a mobile station is handed of to a wireless link with another base station, handoff to a prescribed wireless link is performed after wireless links are established between the mobile station and a plurality of base stations simultaneously. The method includes deciding, on the basis of the soft handoff rate of a base station, the number of soft handoff branches allocated to a mobile station residing in a cell that corresponds to the base station, and performing soft handoff based upon the number of soft handoff branches.

CDMA soft handoff control method

A base-station host system achieves high-speed routing to reduce a burden on a controller which carries out a routing process, and receives a cell containing a plurality of packets (an ATM cell of AAL Type 2) from a base station. A cell containing a plurality of packets is transmitted from the base station to the base-station host system. A packet extracting unit extracts the packets from the received cell. A cell generating unit generates an internally processable cell based on information carried by the payload of a packet. A switch unit switches internally processable cells depending on routes thereof. For reverse communications, internally processable cells are sent from the switch unit to a packet generating unit. The packet generating unit generates packets based on information carried by the payloads of the internally processable cells. A cell transmitting unit collects a plurality of packets designed for the same base station, generates a cell containing those packets, and transmits the generated cell to the base station.

Host system for base station

Call origination processing in a wireless local loop system, wherein a dial tone generating unit and a control unit thereof are provided in a subscriber terminal located in an access network between a user terminal and a local exchange and wherein a path connection forming unit, a VIP call processing unit, a pre-connected channel control unit and a radio channel establishing unit are provied in an access control apparatus located in the access network. By this, obstacles are prevented from occurring in the service of a VIP call.

Growing community of inventors

Kawasaki, Japan

Kosuke Nobuyasu