JPS5932231A - Receiver - Google Patents

Abstract

PURPOSE:To constitute a radio line with high communication quality, by connecting a time constant circuit to a radio wave detecting circuit by a fixed station receiving a connecting signal from a control station among plural fixed stations making communication with mobile stations. CONSTITUTION:A control station 3 switches repetitively the communication between fixed stations 1 and 2 in time division so as to monitor the presence of radio receiving information from a mobile station 4 to the fixed stations 1, 2. The radio wave detecting information from the fixed station 1 fluctuates the vicinity of a radio detection discriminating point according to a received electric field, the control station 3 does not transmit a connecting signal to the fixed station 1. When the receiving electric field level of the fixed station 2 is sufficiently larger than the radio wave detection discriminating point and the radio wave detection information continues for a prescribed time, the control 3 transmits a connection signal to the fixed station 2 to connect the control station 3 and the fixed station 2. When the fixed station 2 receives the connecting signal at a signal receiving circuit 13, a switching circuit 12 is changed over to a time constant circuit 10, the detecting output of a radio wave detecting circiut 9 is passed through the circuit 10, allowing to prevent the interruption of line due to the effect of fading.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a receiver (d device) used for mobile communication, etc.
In particular, it relates to a base station receiving device that performs wireless iJ1 communication with a mobile transmitting device that transmits radio waves only during communication.

[Description of prior art]

Conventionally, in mobile communications, where a large number of fixed stations are placed to perform mobile station Yoshiura 1d, a zone configuration has been adopted in which the same frequency is repeatedly used at a certain distance M11 in order to make effective use of frequencies. is generally carried out. tpi
This distance is determined so that the radio waves from the mobile station do not reach multiple fixed stations at the same time, but due to effects such as fading or the complexity of the terrain, the radio waves may not be received by multiple fixed stations at the same time. Sometimes something happens.

For example, in Figure 1, there is a fixed station 'ζ, -1.2, and mobile station 4 is within the range of fixed station 2, but weak radio waves have also reached fixed station 1, and the electric field level is as shown in Figure 2. Suppose that they are as shown in A and B.

Conventionally, in this type of fixed station receiving device, as shown in the block diagram of the conventional device in FIG.
, passes through the intermediate frequency amplification circuit 6, and is fjE# in the demodulation circuit 7.
Ili! The signal is transmitted through the low frequency circuit 8 and output as an audio signal.

On the other hand, the presence or absence of a received electric field is determined by the radio wave detection circuit 9 that receives the signal from the intermediate frequency circuit 6, and determines whether the input electric field is higher than the reference point and sends out a radio wave detection small signal. This radio wave detection signal is passed through a time constant circuit 10 to a transmission circuit 11 to the control station 3 in order to maintain line connection even in the event of a momentary interruption of the electric field due to fading or the like during a call.
It is sent out as radio wave detection information. Therefore, the second
Even in the case of an extremely low input electric field that moves up and down the decision point of the radio wave detection circuit as shown in Figure 2, the radio wave detection information is as shown in Figure 2C. "Yes" information is sent. For this reason, fixed station I,
The radio wave detection information of 2 is both I"fi' J・,
It is not possible to determine which fixed station the mobile station 4 is within range of. In this way, when the mobile station 4 generates a signal, RTT wave detection information is sent to the control station 3 from the fixed stations 1 and 2 almost simultaneously. 1tll lightning, the control station sequentially monitors the radio wave detection information from each fixed station on a time-sharing basis, but if the radio detection information is detected earlier in fixed station 1 than in fixed station 2, the fixed station The radio wave detection information from fixed station 2 is checked and transmitted through fixed station l (6 lines are configured), and the radio wave detection information from fixed station 2 that is later confirmed for the same mobile station is not received. In other words, even though there is a fixed station with a higher electric field level, conventional devices sometimes configure a communication line with a mobile station through a fixed station with a lower electric field level, resulting in poor communication quality. It had drawbacks.

[Purpose of the invention]

The present invention eliminates the above-mentioned drawbacks, and provides a fixed station that can perform wireless communication with high communication quality by using a fixed station with a higher electric field level to configure an IM communication line with a mobile station. The purpose of the present invention is to provide a receiving device for the following.

[Key points of the invention]

The receiving device of the present invention includes a radio wave detection circuit that detects that incoming radio waves are received at a set level or higher, and a connection signal that indicates that the line of the receiving device is connected from a source other than the receiving device. a signal receiving circuit that operates when the radio wave detecting circuit operates, a time constant circuit that allows a certain predetermined time from when the radio wave detection circuit operates to transmitting an output, and the time constant circuit that operates in response to the operation of the signal receiving circuit. and means for changing the time constant of the device, and is characterized in that when the connection signal is not received, the time constant is shortened or eliminated, and when the connection signal is received, the time constant is lengthened. be.

(Explanation based on Examples) The present invention will be explained below using an example device with reference to the drawings.

FIG. 4 is a block configuration diagram of an embodiment of the fixed station receiver according to the present invention, FIG. 5 is a line configuration diagram, and FIG. be.

In FIG. 4, the same reference numerals as in FIG. 3 are the same constituent blocks as in FIG. The difference is whether the output of the radio wave detection circuit 9 is sent to the J switching circuit I2, and this switching circuit 12 sends the output directly to the sending circuit II, or whether it is sent via the time constant circuit 10. 4 and 9, the switching control of the switching circuit I2 can be performed by the output of the signal receiving circuit 13 which receives the connection signal from the control station 3.

Next, the operation of the 6th example receiving device will be explained.

In FIG. 4, the output of the radio wave detection circuit 9 is the switching circuit 1.
2 and receives the connection signal sent from the control station 3 only when the line is connected. When the output of the circuit 13 is "absent", the l31J exchange circuit 12 is directly connected to the radio wave detection circuit 11, and radio wave detection information is sent to the control station 3 without a time constant. In other words, the radio wave detection information does not have a time constant until one line is connected, and after the communication line is connected, it is sent out with a sufficient time constant.

In FIG. 5, similarly to FIG. 1, the mobile station 4 is connected to the fixed station 2.
If the control station 3 is within the range of ζ, the control station 3 repeatedly switches between fixed stations 1 and 2 in order to monitor the presence or absence of radio wave detection information of the fixed stations 1 and 2. When the radio wave detection information output of the fixed station is [-1-1 for a certain period of time, a connection signal is sent to the signal receiving circuit 13 of the fixed station to perform a connection operation with the fixed station.

Now, the radio wave detection information from the fixed station 1 (the received electric field level from the mobile station 4 received by the fixed station 1 rises and falls in the vicinity of the radio wave output determination point as shown in the 6th IUIA), and the radio wave detection circuit Since the detection output 9 does not go through the time constant circuit 10, it changes according to the received electric field as shown in FIG. 6C.

Therefore, in the control station 3, since the radio wave detection information does not become "present" for a certain period of time, the control station does not send out a connection signal to the fixed station 1 and does not perform a connection operation with the fixed station 1.

In this way, the control station 3 receives low power that raises or lowers the radio wave detection circuit 90 criteria. No line connection is made with the /i4 fixed station.

On the other hand, the received electric field level of fixed station 2 is 61st Tue l 1. +
As shown in Figure 6, since there are more people than the radio wave detection judgment point, the radio wave detection information of the fixed station 2 is transmitted over a certain period of time without going through the time constant circuit IO, as shown in Figure 6.
"Yes". Therefore, the control station () sends a connection signal to the fixed station 2 and performs a connection operation with the fixed station 2.The fixed station 2 receives this connection signal at the signal receiving circuit 13, and then sends a connection signal to the fixed station 2. is switched to the time constant circuit 10 side, and thereafter the detection output of the radio wave detection circuit 9 is passed through the time constant circuit 10 to prevent disconnection of the line due to effects such as fading.

In addition, in the two series of embodiments, the case where the time constant is "no" was explained, but the present invention is not limited to this, and the monitoring time of the radio wave detection IRG signal of the control station is not affected. A device with a short time constant may be used as long as it is within the range of
This may be in the front as long as the detected cutting edge changes depending on the input electric field, such as noise detection.

〔Effect of the invention〕

As explained in Section 2 below, according to the receiving device of the present invention,
An IUI line can be connected to a fixed station with a higher received electric field and higher bell, and a crystalline communication line that is much smaller than J+1 can be constructed.

[Brief explanation of the drawing]

FIG. 1 is a line configuration diagram of a conventional device. The second one is the time chart 1 of the radio waves 4 life waves 1 blue report of fixed station I and 2 by the conventional device. FIG. 3 is a block diagram of a conventional fixed station receiver. FIG. 4 is a block diagram of a fixed station receiving apparatus according to an embodiment of the present invention. FIG. 5 is a line configuration diagram of an embodiment of the present invention. FIG. 6 is a time chart of radio wave detection information of fixed stations 1 and 2 by the apparatus according to the embodiment of the present invention. 1.2...Fixed station, 3...Control station, 4...Mobile station, 5...Mixer circuit, 6...Intermediate frequency amplification circuit,
7... Demodulation circuit, 8... Low frequency circuit, 9... Radio wave detection circuit, lO... Time constant circuit, 11... 1n information sending circuit, I2... Switching circuit, 13...・FD signal receiving circuit. Figure 1 Figure 3

Claims (1)

[Claims] (Ll A mobile station, a plurality of fixed stations that communicate with this mobile station on the same frequency, and one station among the plurality of fixed stations is selected and the selected fixed station is 2. A receiving device installed at each fixed station of a mobile radio communication system, comprising a control station for selectively connecting a radio communication line between the mobile station and the mobile station, the receiver receiving incoming radio waves from the mobile station. A radio wave interception circuit 11δ detects that the signal is received at an electric field level higher than a predetermined setting level.
and a time constant circuit that calculates the time constant in the detection output of this radio wave detection circuit, and the detection output passed through this time constant circuit as the radio wave detection information for communication line selection connection. In a receiving device equipped with a detection circuit that sends signals to a control station, a signal receiving circuit that receives a line connection signal sent from the control station; and a time constant circuit that responds to the received output of this signal receiving circuit. A receiving device comprising a circuit for changing the time constant of.