Sony Corporation

Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Blackberry Corporation

Mitsubishi Denki K.k.

Koutarou Sugisawa

Hideji Wakabayashi

Miho Maeda

Kazuhito Niwano

Satoshi Mizogami

Takahiro Kamada

In order to carry out high-speed packet communications using a large-volume transmission channel like an E-DCH, uplink communication quality must be good. However, in a state in which a link imbalance occurs, a mobile station cannot estimate the uplink communication quality from downlink communication quality. Therefore, the mobile station calculates a path loss from the setting power of a common pilot channel which is notified from a base station, and the received power of the common pilot channel received thereby, and also estimates the received power in the base station on the basis of this path loss. The mobile station further judges the uplink communication quality by estimating the SIR in the base station by using the interference power notified from the base station and the estimated received power.

Communication quality judgment method, mobile station, base station, and Communications System

According to a communications method according to the present invention, data is transmitted from a base station to two or more terminals via a common channel, and transmission power, with which the data is transmitted from the base station to the two or more terminals, is controlled according to a reception state of at least one of the two or more terminals. Furthermore, the terminal transmits reception capability information at a time of selection combining, and at least one of the two or more base stations receives the reception capability information at the time of selective combining and notifies the reception capability information to a radio network controller (RNC) which controls the two or more base stations. When a connection request is issued to the terminal, the RNC refuses assignment of a dedicated channel to the connection request when determining that the assignment of the dedicated channel to the terminal cannot be done based on the reception capability information at the time of selective combining.

Communications system, communications apparatus, communications terminal and communications method

A radio network controller constructed to divide a plurality of base stations into a group of base stations included in an E-DCH active set and a group of base stations included in an active set for soft handovers according to a status of reception of data in each of the plurality of base stations.

Mobile communications system, handover controlling method, radio network controller, and mobile terminal

Data communication sub-slots of a cycle in a time division mode are allocated to communication apparatuses; a maintenance communication sub-slot is allocated to the communication apparatus operating as a master communication apparatus; the communication apparatuses perform data communication with the use of the data communication sub-slots allocated thereto; and the communication apparatus uses the maintenance communication sub-slot to change or monitor information about the communication of the communication apparatuses in the time division mode.

Communication system and communication apparatus

A radio network controlleris so constructed as to divide a plurality of base stationsinto a group of base stations included in an E-DCH active set and a group of base stations included in an active set for soft handovers (i.e., a prior art active set) according to a status of reception of data in each of the plurality of base stations

It is an object to propose a way to assign channelization that is applicable to a case in which the number of multiplexing of DPDCHs (Dedicated Physical Data Channels) is at least five for overshoot of HPSK (Hybrid Phase Shift Keying) modulation. Assignment of channelization codes is set as follows. For all possible combinations of channelization assigned to given data channels and control channels, a transition &#x3b8;from the first chip to the second chip and a transition &#x3b8;from the third chip to the fourth chip are obtained. For each transition, 0 degrees or 180 degrees is desirable, and 90 degrees is the worst, so that a combination is obtained in which squares of sine of respective transitions become the smallest. Consequently, by obtaining a combination that makes sin&#x3b8;+sin&#x3b8;the smallest, the one that is close to the most desirable combination can be obtained.

Growing community of inventors

Tokyo, Japan

Koutarou Sugisawa