JPH0537436A - Radio communication system - Google Patents

Abstract

PURPOSE:To enable communication between slave equipments each other with simple configuration by periodically transmitting a control signal containing a synchronizing signal from a radio base station and exchanging information signals between the slave equipments synchronously to this control signal. CONSTITUTION:Time-division communication is executed between a radio base station 100 and slave equipments 101-102 by using the same frequency f1 and for the communication between the slave equipments 101 and 102, the time- division communication is executed by using the same frequency f1 as well. The radio base station 100 periodically transmits the control signal containing the synchronizing signal to the slave equipments 101 and 102. The slave equipments 101 and 102 receive the synchronizing signal from the radio base station 100, transmit information to the opposite side slave equipments 101 and 102 and receive information signals from the opposite side slave equipments 101 and 102 by using a prescribed time slot synchronizing with the synchronizing signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time-division wireless communication system for communicating between a wireless base station and a plurality of slave units, and more particularly to a wireless communication system enabling communication between a plurality of slave units. .

[0002]

2. Description of the Related Art Conventionally, this type of wireless communication system is shown in FIG.
As shown in (a), the wireless base station 100 and the slave 10
1 to use the frequency f ₁ in the downlink direction from the wireless base station 100 to the slave 101, the slave 1
01 to the wireless base station 100 in the upstream direction, the frequency f ₂
Use to communicate. Similarly, when the wireless base station 100 and the slave 102 communicate with each other, the frequency f ₁ is used in the downlink direction from the wireless base station 100 to the slave 101, and the uplink direction from the slave 102 to the wireless base station 100 is used. Is the frequency f ₂
Used to communicate.

[0003]

In the above-mentioned conventional wireless communication system, when the slave unit 101 and the slave unit 102 communicate with each other, as shown in FIG. 5B, the wireless base station and the slave unit are connected. In addition to the downlink frequency f ₁ and the uplink frequency f _2, a pair of frequencies is further used as the frequencies used between and. That is, the downlink direction f ₁ and the uplink direction f ₂ are used between the wireless base station 100 and the slave 101, and the wireless base station 10
0 and the handset 102 had to use the downlink direction f ₁ A and the uplink direction f ₂ A, and then communicate with each other via the radio base station. Therefore, the radio base station needs at least two transmitters and receivers, and the radio base station needs the line connection device 103 for connecting the communication lines of the two slave units to each other.
There is a drawback that the radio base station becomes complicated.

[0004]

According to the wireless communication system of the present invention, one wireless base station communicates with at least two or more slave units by time-division communication using the same frequency f1 and the slave units are Communication between them is also a method of performing time-division communication of the same frequency f1, and the wireless base station includes means for periodically transmitting a synchronization signal to the two slave units, and the slave unit is And a unit for receiving an information signal from the partner slave unit, a unit for transmitting an information signal to the partner slave unit in synchronization with the sync signal, and a unit for receiving the information signal from the partner slave unit. There is.

[0005]

The present invention will be described below with reference to the drawings. FIG. 1 is a system configuration diagram of an embodiment of the present invention.
In the communication between the wireless base station 100 and the slave 101, the frequency f ₁ is used for communication from the wireless base station 100 to the slave 101 (down direction), and the direction from the slave 101 to the wireless base station 100 is used. The frequency f ₁ is also used for communication in the up direction.
To use. In addition, the slave unit 1 which is one of the main points of the present invention
01 and the handset 102 use the frequency f ₁ in both directions. In addition, the wireless base station 100 includes the slave units 101, 1
A control signal for synchronization is sent to 02, and the slave units 101, 1
02, the time slots TD and TU, which have been used between the base station and the handset until now, are used by the handset as described later. In FIG. 2, the time-divided time slots used in this embodiment are the wireless base station 100 and the slave units 101 and 102.
It shows how they can be used properly. First,
A digital signal of a communication line of frequency f ₁ or a time-divided control signal TD (Time slot down war)
d) and TU (Time slot up ward). Here, the control signal is a control signal sent from the base station to the slave unit, and includes a preamble, a synchronization signal, and control information. Further, the guard bit indicates the non-transmission time of the burst signal for avoiding the interference between the time slots. That is, when the distance between the wireless base station and the slave unit changes, the temporal position of the burst signal sent from the slave unit that is received by the wireless base station shifts, but this guard bit does not interfere with adjacent time slots. You can In the normal communication between the base station and the slave unit, TD indicates a communication signal transmission time from the wireless base station 100 to the slave units 101 and 102, and TU is the slave unit 101 or 102.
From the wireless base station 100 to the wireless base station 100,
In the case of communication between the slaves, the TD is switched from the slave 101 to the slave 102, and the TU is switched from the slave 102 to the time slot of the slave 101.

FIG. 3 is a block diagram of the base station 100 of this embodiment. The telephone 1 is connected to the telephone interface circuit 2, and the encoder 3 encodes an analog signal into a digital signal. Switch 10 after being modulated
To the antenna 11 via. On the other hand, the received wave from the slave unit passes through the antenna 11 and the switch 10 and the reception unit 7
Is demodulated in and input to the decoder 6. The output of the decoder 6 is connected to the telephone interface circuit 2. Receiver 7
The output of the control signal receiving circuit 8 is input to the control signal receiving circuit 8, and the output of the control signal receiving circuit 8 is input to the timing generating circuit 9.
Here, the TD or TU of the child device is received to determine whether the timing is the transmission time slot of the base station or the reception time slot, and the control signal is sent to the switch 10. Another output from the timing generating circuit 9 is connected to the control signal receiving circuit 8, the decoder 6, the encoder 3 and the control signal transmitting circuit 5. The output of the control signal transmission circuit 5 is the transmission unit 4
You are typing into.

FIG. 4 is a block diagram of the slaves 101 and 102 of this embodiment. The telephone 21 is connected to the telephone interface circuit 22, the output of the telephone interface circuit 22 is input to the encoder 23, and the encoder 23 outputs. The output is input to the switch 30 after being modulated by the transmitter 24. The output of the switch 30 is connected to the antenna 31. Switch 30
One output is connected to the receiving unit 27, and the output of the receiving unit 27 is input to the decoder 26 and the control signal receiving circuit 25. The output of the decoder 26 connects to the telephone interface circuit 22. On the other hand, the output of the control signal receiver 25 is connected to the timing generation circuit 28. One output of the timing generation circuit 28 is connected to the switch 30, and the output of the timing generation circuit 28 is connected to the decoder 26, the encoder 23, and the switch 30 by different signals.

Next, the operation of this embodiment will be described. The radio base station generates a timing signal of a constant cycle from the timing signal generation circuit 9, and based on this signal, burst signals are transmitted and received. That is, the timing signal from the timing signal generation circuit 9 is input to the control signal transmission circuit 5, and the control signal transmission circuit 5 periodically generates a control signal including a preamble and a synchronization signal as shown in FIG. After being modulated by the transmitter 4, it is input to the switch 10. The timing signal from the timing generation circuit 9 is input to the control terminal of the switch 10, and the switch 10 operates so that the output of the transmission unit 4 is connected to the antenna 11 only during the time when the signal is transmitted from the wireless base station to the slave unit. As a result, the control signal described above is sent to the slave unit via the antenna. The switch 10 is controlled by the timing generation circuit 9 so that the antenna 11 and the receiving unit 7 are connected during the time other than the time when the radio base station transmits a signal. When the telephone 1 communicates with the slave, the telephone interface circuit 2 converts the 2-wire signal from the telephone 1 into a 4-wire signal.
Therefore, the voice from the telephone 1 is input to the encoder 3, the analog signal is converted into a digital signal, and is input to the transmission unit 4 in burst at the time TD in FIG. 2 according to the timing from the timing generation circuit 9. Switch 10 after being modulated
Then, the signal is transmitted from the antenna 11 to the cordless handset. On the other hand, the communication signal from the slave unit is demodulated by the receiving unit 7 from the antenna 11 through the switch 10 at the time of TU in FIG. 2 and is further converted by the decoder 6 into a digital signal, and the telephone interface circuit. It is input to the telephone set 1 via 2. The timing signal input from the timing generation circuit 9 to the decoder 6 is used to determine the time position for receiving the burst signal.

When the slave 101 communicates with another slave 102, the base station performs the following control operation on the slave. That is, a control signal is transmitted instead of the audio signal at the time of TU in FIG. 2, and this control signal is received by the control signal receiving circuit 8. In this case, the timing signal input from the timing generation circuit 9 is the burst signal TU.
It is used to determine the time position to receive the. When the control signal from the slave unit is received by the control signal receiving circuit 8,
From the control signal transmission circuit 5 to the slave unit 102, the calling signal of the slave unit 102 is inserted into the control bit shown in FIG.
Call the child device 102. Further, a signal indicating the reception of the control signal from the control signal receiving circuit 8 is input to the timing generating circuit 9, and the switch control signal output from the timing generating circuit 9 to the switch 10 is transmitted only during the time when the control signal of FIG. 2 is transmitted. The output of the unit 4 is input to the antenna 11. As a result, only the control signal is transmitted from the wireless base station to the slaves 101 and 102. The control signal from the radio base station is demodulated by the receiving unit 27 from the antenna 31 via the switch 30 and is received by the control signal receiving circuit 25. The received signal is input to the timing generating circuit 28. As for the output of the timing generation circuit 28, the output of the transmission unit 24 is the antenna 31 when the switch 30 is TU in FIG.
It operates to connect to the antenna 31 at other times.
And the receiving unit 27 operates so as to be connected. When the cordless handset 101 and the wireless base station 100 are communicating, the telephone set 2
The voice signal from 1 is converted from a two-line signal into a four-line signal by the telephone interface circuit 22, and the encoder 23
The analog signal is converted into a digital signal at
At the time of U, as a burst signal, input to the transmission unit 24,
After being modulated, it is transmitted from the antenna 31 to the wireless base station via the switch 30. The communication signal from the wireless base station is
The signal is demodulated from the antenna 31 via the switch 30 in the receiving unit 27, the digital signal is converted into an analog signal in the decoder 26, and the analog signal is input to the telephone 21 via the telephone interface circuit 22. On the other hand, the timing signal synchronized with the control signal from the radio base station 100 is output from the timing generation circuit 28 to determine the burst signal transmission time from the encoder 23, and the decoder 2
6 is used to determine when to receive the berth signal. Further, when the slave unit 101 and the slave unit 102 communicate with each other, the slave unit performs the following control operation to the base station. That is, when a control signal is sent from the control signal sending circuit 29 of the handset 101 at the time of TU and the control signal is received by the radio base station 100, the handset 1 is sent from the radio base station.
A control signal including a call signal is sent to 02. In the child device 102, when the control signal from the radio base station 100 is received by the control signal receiving circuit 25, this information is input to the timing generating circuit 28, and the timing generating circuit 28 receives the burst signal at the time TD in FIG. , Switch 30, encoder 23, to receive the burst signal at the time of TU.
It controls the decoder 26. As a result, the slave units 101 and 102 respectively receive the control signal from the wireless base station, and in synchronization with this control signal, the times TU and TD in FIG. 2 are alternately used for the transmission time and the reception time of the communication signal. Thus, the child device 101 and the child device 102 can communicate with each other. In the embodiment of the present invention, the case where there are two communication time slots, TU and TD, as shown in FIG. 2, is explained. However, by further increasing the transmission speed and increasing the communication time slots, The number can be increased.

[0010]

As described above, according to the present invention, it is possible to alternately transmit and receive burst signals in a time division manner by using the same frequency for both radio base station and slave unit communication. Control signal including a synchronization signal periodically, and the slave units perform burst signal transmission / reception using a predetermined time slot in synchronization with the control signal from the wireless base station. Since it is configured, there is an effect that the communication between the slave units can be performed by the configuration of the wireless base station and the slave unit which are easy.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of an embodiment of the present invention.

FIG. 2 is a configuration diagram of a time slot according to this embodiment.

FIG. 3 is a block diagram of a radio base station according to the present embodiment.

FIG. 4 is a block diagram of a slave unit according to the present embodiment.

FIG. 5 is a system configuration diagram of a conventional wireless communication system.

[Explanation of symbols]

1 telephone 2 Telephone interface circuit 3,23 encoder 4,24 transmitter 5,29 Control signal sending circuit 6,26 Decoder 7,27 Receiver 8,25 Control signal receiving circuit 9,28 Timing generation circuit 10,30 switch 11,31 antenna 100 wireless base stations 101,102 cordless handset

Claims (2)

[Claims] 1. Communication between one wireless base station and at least two or more slave units is time-divisional communication using the same frequency f1, and communication between the slave units is also the same frequency f1.
In the method of performing time-division communication, the radio base station is provided with means for periodically sending a synchronization signal to the two slave units, and the two slave units are provided with a synchronization signal from the radio base station. And a means for transmitting an information signal to the partner slave unit in synchronization with the synchronization signal, and a unit for receiving the information signal from the partner slave unit. Communication method. 2. The burst signal TD is first transmitted from the handset A to the handset B after receiving the synchronization signal from the radio base station, and then the burst signal TU is received from the handset B to the handset A. Or the slave unit A first after receiving the synchronization signal.
The slave units A and B are provided with a control means for determining the order of time division communication of whether the burst signal TU is received from the slave unit B and the burst signal TD is transmitted from the slave unit A to the slave unit B. The wireless communication system according to claim 1, wherein the wireless communication system is configured to be capable of alternately communicating with each other in a time division manner.