JPS6234427A - Data transmission controller - Google Patents

Abstract

PURPOSE:To prevent interference of signals with each other, by outputting an over-reach signal which commands another base station to inhibit transmission when transmitting signals to an over-reach area where the signal of the another base station reaches and inhibiting its own transmission upon receiving the over-reach signal from the another base station. CONSTITUTION:When a base station 7 on one side sends a polling signal (b) to a mobile station 8 in an over-reach area 10, the station 7 outputs an over- reach signal (d) to the CPU 3 and signal control section 2 of another base station 7 on the other side from its command circuit 12. Then the inhibition circuit 13 of the base station 7 on the other side is actuated and causes sending of data from the CPU 3 to be inhibited until the over-reach signal (d) disappears. Moreover, the over-reach signal (d) also actuates another inhibition circuit 14 and locks the signal control section 2 in the sense of hardware until the over-reach signal (d) disappears.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data transmission control device that smoothly performs data transmission when transmitting data wirelessly from a base station to a mobile station.

[Prior Art] As this type of data transmission control device, a vehicle dynamic management system as shown in FIG. 2 is conventionally known (see Mitsubishi Electric Corporation Vol. 1.58. No. 0, 19B4).

In Figure 2, the inside of the base station includes a radio device (1), a signal control unit (2), a central processing unit (3), and a command input unit (4).
) and a display device (5) are installed.

As shown in FIG. 3, data is transmitted and received between the base station (7), the mobile station (8), and the position signal generator t (9) to manage the dynamics of the vehicle.

Next, the operation will be explained.

Position signal generator (hereinafter referred to as "sign post")
The mobile station (9) always sends the position signal a, and when the mobile station (8) receives the position signal a, it memorizes the position and responds to the polling signal from the base station (7). This signal C is received by the S line machine (FIG. 1), demodulated and error corrected by the signal control unit (2), and sent to the central processing unit (3). The central processing unit (3) decodes the signal C, learns the position of the mobile station (8), and displays this on the display device (5).
to be displayed.

Also, by key operation from the command input section (4),
It is also possible to page a specific mobile station (8).

[Problems to be Solved by the Invention] However, in the conventional data transmission control device, as shown in FIG. In the overreach area (1o) where the base station (7) can reach the mobile station (1o), the polling signals from both sides interfere with each other, making it difficult for data to reach the mobile station (8) from the base station (7).

This invention was made to solve the above-mentioned problems, and even in overreach areas where signals from multiple base stations can reach, the signals from the base stations can move reliably without interfering with each other. The purpose is to facilitate data transmission by ensuring that the data reaches the station.

[Means for Solving the Problems] In the data transmission control device according to the present invention, when each base station of the same frequency transmits to an overreach area where signals from other base stations can reach, The base station outputs an overreach signal instructing the base station to prohibit its transmission, and also prohibits its own transmission when receiving an overreach signal from another base station.

[Operation] When the data transmission control device in the present invention receives an overreach signal from another base station, it stops transmitting data until the overreach signal disappears. Therefore, signals from multiple base stations will not interfere with each other in the overreach area.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, (7) is a base station, (8) is a mobile station, (
9) is a sign post, and inside each base station (7) there is a radio m (1), a signal control unit (2), a central processing unit (3),
A command input section (4) and a display device (5) are installed. The two base stations (7) transmit polling signals of the same frequency, and the reach range of each polling signal has an overreach area (10) that overlaps with each other.

The central processing unit (3) of each base station (7) transmits an overreach signal that instructs other base stations (7) to prohibit transmission when transmitting to the overreach area (lO). The base station includes a command circuit (12) that outputs an overreach signal d, and a prohibition circuit (13) that prohibits its own transmission when it receives an overreach signal d from another base station (7). Further, the signal control section (2) also includes an inhibition circuit (14).

Next, the operation will be explained.

One base station (7) is located in the overreach area (10)
When sending a polling signal to the mobile station (8) located at Outputs overreach signal d. In response to this overreach signal d, the prohibition circuit (13) of the other base station (7)
is activated, and the transmission of data from the central processing unit "a (3) is prohibited until the overreach signal d disappears.The overreach signal d also activates the prohibition circuit (14), and the overreach signal d is The signal control unit (2) is locked by hardware until the signal is removed.

As mentioned above, polling signals from only one base station (7) are transmitted to the overreach area (10), so the polling signals from the two base stations (7) may interfere with each other. Since this interference is eliminated, there is no possibility that data will be corrupted due to this interference. - Although the above embodiment shows a case where there are two base stations (7), there may be three or more base stations (7) and the same effect as in the above embodiment can be achieved.

[Effects of the Invention] As explained above, according to the present invention, only a signal from one base station reaches an overreach area, so signals from multiple base stations interfere with each other and cause data to be lost. There is no risk of crushing. Therefore, 1
Since signals from one base station can reliably reach the mobile station, data transmission from the base station to the mobile station can be carried out smoothly.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing a data transmission control device according to an embodiment of the present invention, Fig. 2 is a system diagram showing a conventional data transmission control device, and Fig. 3 is a data transmission system equipped with the same data transmission control device. FIG. (7)...Base station, (8)...Mobile station, (10)...
... Overreach area, (12) ... Command circuit,
(13), (14)...Prohibition circuit, b...Signal of the same frequency, d...Overreach signal. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] (1) It has multiple base stations that wirelessly transmit data using signals of the same frequency and mobile stations that receive the signals, and each base station is located in an overreach area where signals from other base stations can reach. When transmitting to another base station,
A data transmission control device comprising: a command circuit that outputs an overreach signal that prohibits the transmission; and a prohibition circuit that prohibits its own transmission when receiving an overreach signal from another base station. .