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:
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:
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 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:
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 management server (2) communicates with relay units (3) through a LAN, the relay units (3) are capable of communicating with wireless terminals (5), which are divided into groups, by short-range wireless communication, and the management server (2) transmits and receives information with the wireless terminals (5) through the relay units (3). A basic frame contains a synchronization signal for synchronizing the wireless terminals (5) to the relay units (3) and a data group for the respective wireless terminals (5). The wireless terminal (5) receives self-addressed data while synchronizing with the relay unit (3) by means of the synchronization signal. The management server (2) has a fast mode in which a duration of the basic frame is generated in T1 seconds and a normal mode in which the duration is generated in T2 seconds. In this case, T1
摘要:
A document administration system includes an administration unit, a discrimination information image discriminating unit, and an image forming apparatus which, forms an image on a recording medium in case that the discrimination information image discriminating unit discriminates that the recording medium has the discrimination information image before the image is formed on the recording medium, and forms the image and the discrimination information image based on the discrimination information connected to the image on the recording medium in case that the discrimination information image discriminating unit discriminates that the recording medium does not have the discrimination information image before the image is formed on the recording medium.