摘要:
A communication system has a server, base station devices, and terminal devices. The server notifies each base station device of a transmission order of a synchronization signal and of the base station device that is designated as a reference. Each one of the base station devices transmits a synchronization signal to the corresponding terminal device based on the transmission order in a case where the one base station device has been designated as the reference. In the case where the one base station device has not been designated as the reference, the one base station device transmits the synchronization signal to the corresponding terminal device at a timing calculated based on a reception timing by the corresponding terminal device of a synchronization signal received from the reference base station device, a transmission order of the reference base station device, and the transmission order of the one base station device.
摘要:
A distribution data presence/absence information generation section generates distribution data presence/absence information indicating whether or not data is included in a frame. A synchronization information generation section generates synchronization information including the distribution data presence/absence information.
摘要:
The present invention relates to a communication system capable of reducing processing loads imposed on a base station device and a server that sets a timing of a synchronization signal for the base station device. A management server (3) provides notification of a transmission order of the synchronization signal to each of a plurality of base station devices (1). The each of the plurality of base station devices (1) immediately transmits the synchronization signal to a terminal device (2) based on a timing of an already-operating clock in a case of receiving notification indicating the first in transmission order from the management server (3), and, in a case of receiving notification indicating another transmission order than the first from the management server (3), receives a synchronization signal transmitted at the earliest timing from another base station device (1), to thereby transmit the synchronization signal to the terminal device (2) at a timing calculated based on a reception timing of the received synchronization signal and the transmission order received by an own device.
摘要:
A distribution data presence/absence information generation section generates distribution data presence/absence information indicating whether or not data is included in a frame. A synchronization information generation section generates synchronization information including the distribution data presence/absence information.
摘要:
Provided are a radio communication system, a receiver, and a transmitter, which are capable of reducing an operation time period of a reception circuit of the receiver and achieving reduction in power consumption even if there is a clock error between the transmitter and the receiver. In a case of a conventional method illustrated in FIG. 1(A), the receiver is operated earlier by a time period (Tm), to thereby achieve synchronization before the clock error of the receiver exceeds the time period (Tm). This requires an extended reception time period for achieving clock synchronization, which therefore prevents the receiver from reducing its power consumption. In view of this, according to the present invention, as illustrated in FIG. 1(B), a synchronization signal is continuously transmitted from the transmitter a plurality of times in a short period of time, and the receiver receives only one of the continuously-transmitted synchronization signals. With this, the receiver can achieve synchronization of a reference clock by starting a reception operation earlier only by a time period (Tm′) (Tm′≦Tm).
摘要:
A radio communication system has a transmitter and a receiver that transmits and receives, respectively, synchronization signals. The transmitter has a multiple-synchronization-signal generation section configured to generate the synchronization signals, a radio circuit configured to transmit the synchronization signals in a predetermined transmission cycle from a start time of the predetermined transmission cycle and with an interval shorter than the predetermined transmission cycle, and a synchronization signal sequence number generation section configured to assign a sequence number to each of the synchronization signals. The receiver has a synchronization signal detection section configured to detect any one of the synchronization signals transmitted by the transmitter, and has a clock error correction section configured to correct an error of a reference clock based on the sequence number assigned by the synchronization signal sequence number generation section to the synchronization signal detected by the synchronization signal detection section.
摘要:
A frame generation device has a frame generation section that generates a frame including synchronization information for achieving synchronization with a reception device from among a group including one or more reception devices each of which receives information within the frame, address information indicating an address within the frame for transmitting data, and data transmitted to the reception device included in the group. A group-basis distribution data presence/absence information generation section generates group-basis distribution data presence/absence information indicating whether or not the transmitted data is included in the frame. A synchronization information generation section generates synchronization information including the group-basis distribution data presence/absence information. The frame generation section generates the frame such that the group-basis distribution data presence/absence information is allocated prior to the address information. A central processing unit controls operation of the frame generation section, group-basis distribution data presence/absence information generation section, and synchronization information generation section.
摘要:
A group-basis distribution data presence/absence information generation section generates distribution data presence/absence information indicating whether or not data to be transmitted to a reception device included in a group that includes one or a plurality of reception devices is included in a frame. Further, a synchronization signal generation section generates synchronization information including the distribution data presence/absence information.
摘要:
Novel xanthine compounds represented by the following formula: ##STR1## wherein each of R.sup.1, R.sup.2 and R.sup.3 independently represents hydrogen or lower alkyl;each of X.sup.1 and X.sup.2 independently represents oxygen or sulfur; and Q represents: ##STR2## The compounds are useful as a diuretic, a renal-protecting agent and bronchodilator.
摘要:
A confocal scanning microscope including: an objective system (second objective lens 23 and objective lens 24) illuminating a sample SA with illumination light; a scanning mechanism 31 scanning the sample SA to obtain an intensity signal; and a scanning optical system 32 provided between the scanning mechanism and the objective system. The scanning optical system composed of, in order from the scanning mechanism side, a first positive lens group G1, a second negative lens group G2, and a third positive lens group G3. The third lens group has two chromatic aberration correction portions each formed by a positive lens and a negative lens or negative lens and positive lens. Glass materials are selected such that one performs chromatization and the other performs achromatization, thereby providing a confocal scanning microscope capable of correcting lateral chromatic aberration generated in the objective system in the specific wavelength region by the scanning optical system.