JPS63299529A - Repeating installation - Google Patents

Abstract

PURPOSE:To improve the stability and the frequency efficiency by controlling 1st and 2nd transmitter-receivers as well as the 1st and 2nd memories in accordance with the output of a synchronism detector and the transmission/reception state of a master radio station. CONSTITUTION:A synchronism detector 11 receives the signal from a master radio station and detects the transmission timing of the master radio station. Then the detector 11 connects the switches 3 and 4 to terminals 31 and 42 when the master radio station is set under a transmission state and at the same time controls the 1st and 2nd receivers under the reception states, 1st and 2nd memories 6 and 9 under the write states, and the 1st and 2nd transmitters under the pause states respectively. While the switches 3 and 4 are connected to terminals 32 and 41 when the master radio station is set under a reception state. At the same time, the memories 6 and 9 are controlled under the read states together with the transmitters 7 and 8 under the transmission states, and the receivers 5 and 10 under the pause states respectively. Thus it is possible to avoid the simultaneous operations of both the transmitter and the receiver of a repeater. As a result, the unstable oscillations, etc., are never produced despite the same transmission and reception frequencies.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a relay device for expanding the communication range in wireless communication, and in particular to a relay device for expanding the communication range in wireless communication, and in particular for transmitting and receiving using the same frequency in a mobile communication radio station. The present invention relates to a relay device for expanding the communication range to places where radio waves are difficult to reach, such as inside tunnels and underground malls, in a so-called Bing-Bong communication system that realizes two-way communication by performing periodic and alternating communication.

[Prior Art] Conventionally, relay devices have been widely used to expand the communication range of wireless communications. One method is to amplify the received signal using a relay device and retransmit it at a different frequency.

In this method, since the transmitting and receiving frequencies of the relay device are different, there is less interference between transmitting and receiving, and the relaying profit 75 can be set to a large value.

However, since the frequency is converted by the relay device, it is necessary to switch the frequency relationship between when two radio stations communicate directly and when they communicate via the relay device, and control for this is required. Furthermore, since a frequency for relaying is required, the efficiency of frequency utilization also deteriorates.

Another method is to provide sufficient isolation between transmitting and receiving antennas and relay them at the same frequency.

However, in the case of this method, unless the gain of the relay amplifier is set with a sufficient margin for the isolation between the antennas, unstable operation such as oscillation will occur, so a large relay gain cannot be obtained for -m.

[Problems to be Solved] The present invention has been made in view of the above problems, and its purpose is to realize a relay device that is stable and has high frequency efficiency.

[Means for Solving Problems] In order to achieve the above object, the relay device of the present invention includes a first antenna system facing a parent radio station that determines the timing of transmission and reception, and a second antenna system facing the other child radio station. an antenna system, a first receiver connected to the first antenna system, a first storage device that temporarily stores the output of this receiver, and a signal read out from this storage device from a second antenna system. a first transmitting/receiving device having a first transmitter for transmitting data; a second receiver connected to a second antenna system; a second storage device for temporarily storing the output of the receiver; a second transmitter/receiver having a second transmitter that transmits the read signal from the first antenna system; and a synchronization detector that is connected to the first antenna system and detects the period and timing of transmission and reception. It is configured.

[Example] Next, the present invention will be explained with reference to the drawings.

Note that in the following description, the direction from the parent radio station to the slave radio station will be referred to as downlink, and the opposite direction will be referred to as uplink.

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

The first antenna 1 is an antenna facing a parent radio station, and the second antenna 2 is an antenna facing a slave radio station. Switches 3 and 4 are for switching antennas, and together with antennas 1 and 2 constitute first and second antenna systems, respectively.

When the parent radio station is transmitting, switch 3.4 is connected to terminal 31.
42, respectively. Then, the downlink signal is received by the first receiver 5 and stored in the first storage device 6, and at the same time, the uplink signal from the child radio station is received by the second receiver 10 and stored in the second storage device. It is stored in 9.

When the parent radio station is receiving, the switches 3 and 4 are connected to the terminals 32 and 41, respectively. Then, the uplink signal is read out from the second storage device 9 and transmitted from the second transmitter 8 to the parent radio station via the antenna 1, and at the same time, the downlink signal is read out from the first storage device 6. and is transmitted from the first transmitter 7 to the child radio station via the antenna 2.

The synchronization detector 11 receives a signal from the parent radio station, detects the transmission timing of the parent radio station, and connects the switches 3 and 4 to the terminals 31 and 42 when the parent radio station is in the transmitting state. , the receivers 5 and 10 are placed in a receiving state, the storage devices 6 and 9 are placed in a writing state, and the transmitters 7 and 8 are placed in a resting state. Also, when the parent radio station is in the receiving state,
The switch 3.4 is connected to the terminal 32.41, and the storage device 6.9 is controlled to be in a read state, the transmitters 7 and 8 are controlled to be in a transmitting state, and the receiver 5.10 is controlled to be in a hibernation state.

By operating in this manner, the transmitter and receiver of the repeater can be prevented from operating at the same time, and unstable operations such as oscillation will not occur even if the transmitting and receiving frequencies are the same.

In this embodiment, the synchronization detector 11 is provided independently from the receiver 5.10, but it is clear that the radio frequency section of the receiver 5.10 can be shared.

Furthermore, when the synchronization detector 11 is unable to establish synchronization detection, it is necessary to control the repeater to a receiving state in order to establish synchronization and to avoid disturbing the system.

Furthermore, as for the antenna system, in addition to the method using a switch as in this embodiment, the present invention can also be implemented using a method using a circulator or a method in which transmitting and receiving antennas are provided separately.

FIG. 2 is a time chart illustrating the present invention in detail.

State 20 in the figure indicates the state of the parent radio station, and the signal 21
indicates the signal transmitted from the parent radio station, the state 22 indicates the state of the downlink repeater consisting of the first receiver 5, the first storage device 6, and the first transmitter 7, and the signal 23 indicates the state of the downlink repeater from the downlink repeater. The state R24 indicates the state of the child radio station, the signal 25 indicates the uplink signal transmitted from the child radio station, and the state 26 indicates the state of the second receiver 10, second storage device 9, second The signal 27 represents the state of the uplink repeater consisting of the transmitter 8, and the signal transmitted from the uplink repeater.

Also, TX indicates the transmission state, RX indicates the reception state, DI, D
2. D3 receives the downlink signal, Ul, U2 . U3 represents an upstream signal.

As is clear from the figure, the communication system of the embodiment exchanges up and down signals by periodically repeating transmission and reception between the parent radio station and the repeater, and between the repeater and the slave radio station. Transmission is carried out in a so-called ping-pong system, with downlink signals DI, D2, D3 being sent from the parent radio station to child radio stations, and uplink signals U1, U2, . It can be seen that U3 is being transmitted from the child radio station to the parent radio station.

Furthermore, the uplink and downlink repeaters either transmit or receive together, and the transmitted signal does not interfere with the received signal.

However, the uplink signal sent from the repeater to the parent wireless station,
Since the downlink signals transmitted to the child radio stations are transmitted simultaneously, the downlink signals at the parent radio station and the uplink signals at the child radio station cause interference as interference signals, but antenna systems 1 and 2 If a certain degree of isolation is maintained between them, it can be ignored in practical terms. Similarly,
The downlink signal from the parent radio station and the uplink signal from the child radio station interfere at the repeater, but this is also the case with antenna system 1.2.
It can be ignored in practice by providing a certain degree of isolation between them. The amount of isolation required at this time is about 20 to 30 dB, which is much smaller than the amount of isolation required when repeating the same frequency.

[Effects of the Invention] As explained above, according to the present invention, in the ping-pong system, by providing a storage device in the repeater, it is possible to realize the same frequency relay, and also to provide a repeater device with no interference between transmitting and receiving. It can be realized, and it is highly effective in expanding the number of relay applications and improving frequency usage efficiency.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is a time chart diagram explaining the present invention in detail. 1, 2...Antenna 3.4...Switch 5.10...Receiver 6.9...Storage device 7.8...Transmitter 11...Synchronization detector

Claims (1)

[Claims] In a communication system that realizes two-way communication by periodically and alternately performing transmission and reception between wireless stations using the same frequency, a parent wireless station that determines the timing of transmission and reception; The first one facing
a second antenna system facing the other child radio station, a first receiver connected to the first antenna system, a first storage device that temporarily stores the output of this receiver, and a first storage device that temporarily stores the output of this receiver. a first transmitter/receiver having a first transmitter that transmits a signal read from a storage device from a second antenna system; a second receiver connected to the second antenna system; a second transmitting/receiving device having a second storage device that temporarily stores the output, a second transmitter that transmits the signal read from the storage device from the first antenna system, and connected to the first antenna system. and a synchronization detector that detects the period and timing of transmission and reception, and according to the output of the synchronization detector, when the main radio station is in the transmission state, the first and second receivers are brought into the reception state, and the first and second receivers are brought into the reception state. 1. Put the second storage device into writing state,
A relay device characterized in that when a main radio station is in a receiving state, the first and second transmitters are set to a transmitting state, and the first and second storage devices are controlled to be in a reading state.