Abstract: A multi-port apparatus used to communicably connect a computer and a plurality of apparatuses connected to the computer through the computer serial communication ports, such as two computer serial communication ports. A second serial communication port of the computer is connectable to ports corresponding to the plurality of apparatuses desired to be communicated with. A changeover switch is controlled through a first serial communication port of the computer to select one of the plurality of the apparatuses to connect with the second serial communication port of the computer and communicating with the one apparatus through the second serial communication port.

Abstract: In a mobile communication system, same downlink signals can be transmitted to a mobile station via a plurality of base stations. A radio network controller in the mobile station includes an acquirer configured to acquire a reception quality of the downlink signal in the mobile station; a determiner configured to determine, based on an acquired reception quality, whether or not to transmit the same downlink signals to the mobile station via a first base station managing a first cell in which the mobile station is located and a second base station managing a second cell adjacent to the first cell; and an instructor configured to instruct the second base station to transmit the downlink signal to the mobile station.

Abstract: A communication system is disclosed that is capable of reducing data delay in transmitted hierarchized data and selecting predetermined data from the transmitted hierarchized data for communication according to conditions of the receiving end. The communication system includes a signal transmitting device that hierarchizes data to be transmitted and transmits the hierarchized data, and a signal receiving device that receives the data from the transmitting device. The signal transmitting device includes a hierarchized data transmitting unit that hierarchizes the data to be transmitted into a number of layers and transmits the data layers. The signal receiving device includes a layer identifying unit that identifies the data layers transmitted from the signal transmitting device, and a hierarchized data receiving unit that selects the identified data layers according to at least one of receiving capability and a propagating environment of the signal receiving device, and receives the selected data layers.

Abstract: The present invention provides a radio base station using the conventional downlink transmit diversity which can compensate for the degradation of transmission quality even when a plurality of users (mobile terminals) share a single time slot using a code division multiple system. The radio base station includes a channel estimator 16 for performing channel estimation of an uplink time slot; a transmit diversity controller 141 to 14N for controlling the transmit diversity used for downlink time slots DL#1 to DL#N based on said channel estimation and the number of users sharing the downlink time slot when using a code division multiple system; a data transmitter 15 for transmitting data via downlink time slots DL#1 to DL#N using the controlled transmit diversity.

Abstract: The object of the present invention is provide a mobile communication system which can reduce power consumption of a mobile station without increasing the number of times the data signals which are to be received by the mobile station are retransmitted. The base station 10 comprises a signal transmitter 11 configured to transmit the data signal a to the mobile station 30 within a predetermined period, and transmit each of retransmission signals a1 to a3 of the data signal a, in a form different from that of the data signal a, from the base station 10 to the mobile station 30 within the predetermined period A.

Abstract: A radio network controller can set up a connection with a mobile station located in a specific cell under control of the radio network controller. The radio network controller includes a connection setup request transmitter configured to transmit a connection setup request for request to set up the connection to the mobile station located in the specific cell; and a judger configured to judge whether or not to need to acquire information of the mobile station located in the specific cell. The connection setup request transmitter is configured to transmit the connection setup request to the mobile station located in the specific cell, when the judger judges to need to acquire the information of the mobile station.

Abstract: There is provided a radio communication device able to adaptively adjust a pilot symbol insertion rate and improve efficiency of channel estimation and data transmission. It comprises a channel estimation unit that performs the channel estimation using the pilot symbols, a storage unit that stores a plurality of estimated values obtained by the channel estimation unit, a determination unit that compares the estimated values stored in the storage unit and determines an amount of change of the estimated values, and a notification unit that notifies the pilot symbol insertion unit of the amount of change of the estimated values.

Abstract: A radio network controller can set up a connection with a mobile station located in a specific cell under control of the radio network controller. The radio network controller includes a connection setup request transmitter configured to transmit a connection setup request for request to set up the connection to the mobile station located in the specific cell; and a judger configured to judge whether or not to need to acquire information of the mobile station located in the specific cell. The connection setup request transmitter is configured to transmit the connection setup request to the mobile station located in the specific cell, when the judger judges to need to acquire the information of the mobile station.

Abstract: For utilization of advantage of mobile packet communications to have an improved efficiency in use of radio channel resources, while limiting increase in transmission delay to prevent degradation of quality, a memory (33) is configured to store information on currently set packet calls, a new call decider (32) is implemented, upon reception of a setup request of a packet call transmitted from a mobile station (10), to make a decision depending on the information stored in the memory, as to whether or not the packet call setup-requested is a new call, and an admission concluder (32) is implemented, upon a decision for the packet call to be the new call, to conclude whether or not to admit the packet call.

Abstract: A device testing apparatus, such as a hard disk drive (HDD) testing apparatus, using one host computer to test a plurality of the devices, such as to burn-in test HDDs. A host computer having at least two serial communication ports is communicably connected to power cards which supply operating power to each HDD to be tested. A serial communication exchanger is communicably connected to the serial communication ports of the host computer and to the HDDs, and responds to channel selection instructions issued by the host computer to selectively establish a serial communication channel among HDDs, the power card, and the host computer. The single host computer conducts the testing of the HDDs by communicating with the HDDs via the established serial communication channel.

Abstract: It is an object of the present invention to provide a mobile station which enables transmission of control information on broadcast communication or multicast communication to a radio network controller without establishing a dedicated channel in broadcast communication or multicast communication. The mobile station related to this invention includes a control information generating unit (14) for generating control information on broadcast communication or multicast communication, a control information identifier adding unit (15, 16, 17) for adding a control information identifier for specifying a type of the control information to the control information, and a transmitting unit (12) for transmitting the control information to a radio network controller (RNC) via a common channel.

Abstract: The adaptive modulation method for use in a mobile communication system employing a TDMA scheme associates a modulation scheme with each time slot within a frame, and modulates transmission data of a communication channel using the modulation scheme associated with the time slot into which the communication channel is assigned.

Abstract: A radio network controller controls a location registration area which is formed by a plurality of cells. The radio network controller includes a location registration information receiver configured to receive a location registration information for registering a mobile station in the location registration area; a reception capability acquirer configured to acquire a reception capability of the mobile station; and a measurer configured to measure the number of the mobile stations capable of receiving broadcast data or multicast data in the location registration area, in accordance with the location registration information and the reception capability.

Abstract: A receiver of a mobile station or a base station in radio communications is formed by a correlation unit for generating a delay profile for specifying paths by taking correlations by using replica signals for a received pilot signal, and a path selection unit for comparing a power level of each path in the delay profile with a threshold determined according to an index value regarding a communication state, selecting paths for which a comparison result satisfies a prescribed condition as valid paths, and outputting a selected delay profile formed by the valid paths as a channel estimation value.

Abstract: When a mobile station communicates with a base station by way of one or a plurality of other mobile stations, the mobile station acting as a relay station determines whether the data demodulated after being received is reception data for the mobile station or transfer data to be transmitted to the other mobile station or the base station, decides a modulation mode suitable for transmitting sum data of the transfer data and transmission data if the transmission data is generated in the mobile station, and transmits the sum data while modulating the sum data according to the modulation mode decided. The base station demodulates a reception signal relayed by the mobile stations according to the modulation mode of the mobile station having directly communicated with the base station, and identifies each user data multiplexed.

Abstract: A mobile phone 1 receives a home cell signal sent from a base station B1 and a foreign cell signal sent from a base station B2 or from a mobile phone 21 in a foreign cell A2. The mobile phone 1 receives spreading codes C2–C4 sent from the base station B1, as home cell codes. The mobile phone 1 detects the interference between the home cell signal and the foreign cell signal. When the interference is detected, the mobile phone 1 receives a spreading code C1 sent from the base station B2 or from the mobile phone 21, as a foreign cell code. The mobile phone 1 cancels an interference signal by joint detection, using the home cell codes and the foreign cell code.

Abstract: In a mobile communication system, interference power from adjacent cells is effectively reduced and transmission power is limited. A transmission loss estimation unit 202 and a transmission power estimation unit 204 estimate transmission power necessary for transmission of a downstream signal. According to an upstream signal from each of plurality of mobile terminal devices to a base station, a grouping unit 206 divides a plurality of mobile terminal devices into groups sharing a plurality of wireless resources according to the estimated transmission powers. Downstream signals to be transmitted to mobile terminal devices belonging to each of the groups formed by the grouping means are transmitted simultaneously with each other. Also, priorities are set for the plurality of wireless resources and the mobile terminal devices belonging to the groups divided by the grouping unit 206 are assigned according to the set priorities.

Abstract: A radio network controller comprises a cell selector configured to select a cell to use by a mobile station after data reception, and a mobile station controller configured to control the mobile station to communicate by radio using the cell selected by the cell selector after the data reception.

Abstract: A device testing apparatus, such as a hard disk drive (HDD) testing apparatus, using one host computer to test a plurality of the devices, such as to burn-in test HDDs. A host computer having at least two serial communication ports is communicably connected to power cards which supply operating power to each HDD to be tested. A serial communication exchanger is communicably connected to the serial communication ports of the host computer and to the HDDs, and responds to channel selection instructions issued by the host computer to selectively establish a serial communication channel among HDDs, the power card, and the host computer. The single host computer conducts the testing of the HDDs by communicating with the HDDs via the established serial communication channel.

Abstract: A mobile communication controlling apparatus for controlling inter-frequency handover includes a required quality identifying unit configured to identify a quality required for data addressed to a mobile station, a transmission rate control unit configured to control a data transmission rate of a higher layer based on the identification result supplied from the required quality identifying unit, and an inter-frequency handover instruction unit configured to temporarily suspend signal transmission from a radio base station connected to the mobile communication controlling apparatus and allow the mobile station to perform inter-frequency measurement.