Abstract:
A mobile communication system includes an association requesting unit provided in a base station and configured to request a base station controller, which is an upper node, to associate the base station with a tracking area; and a state control unit provided in the base station controller and configured to monitor entry or appearance and exit or disappearance of mobile stations in and from the tracking area associated with the base station, to cause the base station to transition to a serving state if at least one of the mobile stations enters or appears in the tracking area, and to cause the base station to transition to a radio-unit-inactive state if all of the mobile stations exit or disappear from the tracking area.
Abstract:
A mobile communication system includes a condition reporting unit provided in a base station controller and configured to report to a mobile station via the target base station or another base station measurement and report conditions for determining whether to measure and report a reception quality level of a radio signal transmitted from the target base station; a measurement reporting unit provided in the mobile station and configured to measure the reception quality level of the radio signal if the measurement condition is satisfied and to report the measured reception quality level to the base station controller via the target base station or the other base station if the report condition is satisfied; and a radio parameter control unit provided in the base station controller and configured to control a radio parameter of the target base station or the other base station based on the reported reception quality level.
Abstract:
A mobile communications system is disclosed. The mobile communications system includes a unit which causes a mobile station apparatus residing within a communication area of an arbitrary base station apparatus to measure a propagation state of a wireless signal from a surrounding base station apparatus and which collects the measurement results; and a unit which obtains location information of the mobile station apparatus.
Abstract:
In mobile communication systems employing the CDMA method, the communication quality is acquired from the CDMA pilot channel. A communication quality acquisition apparatus comprises a delay profile acquisition unit comprising a control unit, synchronization unit and measurement unit, in addition to a data storage unit. The communication quality is measured by the synchronization unit and the measurement unit which are alternatively controlled by the control unit. When the communication quality is acquired through the CDMA pilot channel, the data acquisition efficiency can be significantly raised.
Abstract:
To automatically set up temporarily the parameters required for radio communication, based on the parameters acquired from another base station apparatus existing in the neighborhood. A pair of base station identifier and down scrambling code reported from a base station apparatus in the neighborhood is acquired. The non-overlapping down scrambling code is set to a newly established base station apparatus based on the acquired contents. Whether or not the base station apparatus is located in the neighborhood is judged according to at least one of the Hop number and the required arrival time on a communication path up to the base station apparatus.
Abstract:
A tire bead core has an annular body formed by annularly winding and bundling one bead wire in the form of a quadrangle in cross section which has two pairs of opposing sides substantially parallel to each other. The annular body comprises a plurality of winding portions radially stacked, each of which comprises sections of the bead wire annularly wound so as to align in a widthwise direction of the bead core. A winding portion of the annular body located radially outward is displaced to one side of the widthwise direction with respect to a winding portion of the annular body located radially inward.
Abstract:
A base station and a scrambling code setting method of automatically setting up a scrambling code for the base station to use are offered. The base station includes: a scrambling code setting unit for setting up a base station identifier and a provisional downlink scrambling code that is provisionally assigned; and a transmitting unit for spectrum-spreading the base station identifier by the provisional scrambling code, and for transmitting the base station identifier; wherein the scrambling code setting unit assigns a lasting downlink scrambling code based on a report concerning reception of the base station identifier.
Abstract:
A base station is disclosed. The base station includes: a service area status determination unit configured to determine status of a service area of the base station based on received signals from mobile stations; a total transmission power determination unit configured to determine status of total transmission power of the base station based on total transmission power of surrounding base stations; a transmission power determination unit configured to determine transmission power of a common control channel of the base station based on the status of the service area and the status of the total transmission power; and a transmission power setting unit configured to set the transmission power determined by the transmission power determination unit.
Abstract:
In order to perform synchronization detection with high speed, high precision and high reliability and to measure communication quality (propagation characteristics) at high precision and high efficiency, a mobile station (202) includes synchronization detecting portion (221) for detecting synchronization chip timing of channel to be measured, a synchronization chip timing information portion accumulating information of detected synchronization chip timing, a correlation detecting portion (222) deriving a correlation value between spreading code of the channel to be measured and a received signal for performing communication with a base station and measurement of communication quality with taking the detected synchronization chip timing as a reception chip timing, a time series generating portion (223) for generating a time series data of received signal vector after correlation detection, and a communication quality calculating portion (224) for calculating communication quality from generated time series data.
Abstract:
A pneumatic tire of the present invention, which has a bead core buried in a bead portion, in which a ratio dw/D of an inner diameter dw of the bead core to a heel diameter D of a rim, which is specified in a public standard, and a ratio dt/D of a heel diameter dt of the bead portion to the heel diameter D of the rim satisfy the following inequalities: 1.009