JPH0332120A - Radio repeater - Google Patents

Abstract

PURPOSE:To adjust the time axis between a slave station and a relay station without intervention of a master station by providing a transmission timing designation means designating the information at which talking channel the time axis is to be adjusted to the slave station. CONSTITUTION:A timing designation circuit 20 at a relay station 50 designates the information at which talking channel of a radio line the time axis is to be adjusted to the slave station. When the time axis code is sent from a slave station 60 through the said talking channel in response to the designation, a time axis code detection circuit 12 detects the time axis code and a time axis difference detection circuit 14 detects a difference between the time axis of the slave station 60 and the time axis of its own relay station. Then when a discrimination circuit 26 discriminates it that the connection of a radio line is not made between the its own relay station and the master station 40, the circuit 26 sends a data relating to the difference of the time axes detected by a transmitter 10 to the slave station 60. Thus, even when the radio line between the relay station 50 and the master station 40 is not interconnected, the time axis between the slave station 60 and the relay station 50 is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wireless relay device that relays time division multiplex communications between a master station and a plurality of slave stations.

C. Prior Art] Generally, as shown in FIG. 2, a time division multiple access wireless system is composed of a master station 4o, a plurality of wireless relay devices (hereinafter referred to as relay stations) 50, and a plurality of slave stations 60. In the communication system, since the distances between the master station 4o and the plurality of relay stations 50 and slave stations 6o are different, the distance between the master station 4o and the relay stations 5o is different.
The radio wave propagation time between the terminal and the slave station 60 is not uniform.

Therefore, a delay time inversely proportional to the distance from the master station 40 or the relay station 5'0 is added to the relay station 50. It forms the time axis of the slave station 6°. At that time, each relay station 50
If the time axis received by the slave station 60 is off, it is necessary to obtain information indicating the degree of deviation and adjust the time axis accordingly.

A conventional method for obtaining information necessary for adjusting the time axis, particularly information regarding the difference in time axis between the relay station 50 and the slave station 60, will be described below with reference to FIG. In addition, in FIG. 3, 400 is a master station, 500 is a relay station, 600 is a slave station, and the slave station 600 has antennas 1. Shared 12. Transmitter 3. The relay station 500 includes a reception Tm4 time axis code generation circuit 5 and a timing information detection circuit 6, and an antenna 7.
18. Shared aircraft 8.17. Receivers 9, 16. Transmitter 10.
15. Relay station time axis generation circuit 11. The master station 400 includes a time axis code detection circuit 127, a time axis difference detection circuit 14, and an antenna 19. Shared machine 20. Receiver 21, transmitter 22. Calculation circuit 23. Conversion circuit 24゜Sending timing specification circuit 2
Contains 5.

First, the transmission timing designation circuit 25 of the master station 400
From there, the transmitter 22 sends out information on which call channel of the wireless line the time axis is to be adjusted through the control channel. Having received this information, the slave station 600 uses the tie-matching information detection circuit 6 to detect which call channel is to be used for adjustment, and transmits a predetermined code made up of the time axis code generation circuit 5 to the transmitter 3 for the call. Send it to the upper station on the channel. When the receiver 9 of the relay station 500 receives the code, the time axis code detection circuit 12 detects the time axis code from the output, and the time axis unique to the relay station 500 is output from the relay station time axis generation circuit 11. The time axis difference detection circuit 14 detects the difference between the time axis and the time axis indicated by the time axis code of the slave station 600 detected by the time axis code detection circuit 12, and sends it from the transmitter 15 to the master station 400. . Master station 4
When the receiver 21 of No. 00 receives the transmitted time axis difference information, the calculation circuit 23 calculates the distance from the time axis difference information and outputs this distance information to the conversion circuit 24. The conversion circuit 24 converts the input distance information into data for the slave station 600, and sends the data to the slave station 600 through the relay station 500 on the communication channel of the wireless line specified by the transmission timing designation circuit 25 that operates independently in the own station 400. station 600.

The slave station 600 adjusts the time axis of its own station 600 based on the transmitted distance information. In addition, the master station 40
The distance information obtained by the conversion circuit 24 of 0 is also provided to the system operator as data for understanding the situation of each station. Also, instead of the distance information, the time axis difference itself is sent to the slave station 600, and based on that, the slave station 600
It is also possible to adjust the time axis in .

(Problem to be Solved by the Invention) As described above, it is possible to obtain information indicating how much of a difference there is in the time axis between a relay station and a slave station, and based on that information, However, in this conventional method, the time axis difference information detected at the relay station is first transmitted to the master station, processed by the master station, and transmitted again via the relay station. When adjusting the time axis between the slave station and the relay station in order to transmit the information to the corresponding slave station,
The wireless line between the relay station and the master station must be completely connected, otherwise the time axis cannot be adjusted. Therefore, when installing slave stations and making on-site adjustments, it is necessary to always take steps to connect wireless lines from the upper station to the lower station, which does not improve work efficiency.

The present invention has been made in view of these circumstances,
The purpose is to make it possible to adjust the time axis between the slave station and the relay station without the intervention of the master station.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a relay station that relays time-division multiplex communication between a master station and a plurality of slave stations, which independently operates on a relay station and which communication channel of a wireless line is used. transmission timing specifying means for specifying information on whether to adjust the time axis to the slave station; determining means for determining whether or not a wireless line is connected to the master station; a code detection means for detecting a time axis code transmitted on the specified communication channel, and a time axis of the slave station obtained from the time axis code detected by the code detection means and a time axis of the own relay station. and a time axis difference detection means for detecting the difference between the time axes, and data regarding the difference in time axes detected by the time axis difference detection means when the determination means determines that the wireless line is not connected to the master station. and transmitting means for transmitting data to the slave station via the communication channel.

[Effect]

In the relay station of the present invention, the transmission timing specification circuit, which operates independently in the own station, specifies information on which communication channel of the wireless line to adjust the time axis to the slave station, and responds to this specification. When a time axis code is sent from the slave station on the communication channel, the code detection means detects the time axis code, and the time axis of the slave station and own relay station obtained from the detected time axis code are detected. When the time base difference detection means detects the difference between the time base of the relay station and the time base of Data regarding the time axis difference detected by the time axis difference detection means is transmitted to the slave station.

〔Example〕

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of main parts showing an example of a time division multiple access wireless communication system including a relay station according to an embodiment of the present invention, and the same reference numerals as in FIGS. 2 and 3 indicate the same parts. , 26 is a determination circuit, 2 is a conversion circuit, 29 is a sending timing designation circuit, and 30 is a switch.

The relay station 50 of the embodiment of FIG. 1 is replaced by the conventional relay station 5 of FIG.
What is different from 00 is a transmission timing designation circuit 29 that operates independently in the local station 50 and specifies information on which call channel of the wireless line is used to adjust the time axis, and a time axis difference detection circuit. 14, a conversion circuit 28 that converts the time axis difference detected in step 14 into predetermined data, a determination circuit 26 that determines whether the wireless line between own relay station 50 and master station 40 is connected, and determination circuit 26. When it is determined that the wireless line is connected to the master station, contact A is connected to contact C, and the receiver 16 and transmitter IO are connected to enable relay operations based on instructions from the master station 40. , when not connected, connect contact A to contact B to connect transmitter 10 and conversion circuit 28.
It connects with the sending tie calling designation circuit 29 and transmits it to its own relay station 50.
The main feature is that a switch 30 is provided that enables unique operations.

Next, referring to FIG. 1, a description will be given of the operation when adjusting the time axis between the slave station 60 and the relay station 50.

In the relay station 50, if the synchronization signal from the master station 40 cannot be received, that is, if the wireless line between the master station 40 and the own relay station 50 is not connected, the internal determination circuit 26 determines that. Contact A of switch 30 is connected to contact B. In this state, when the transmission timing designation circuit 29 operating independently in the local station 50 transmits information on which call channel of the wireless line is used to adjust the time axis, the information is transmitted via the switch 30. and transmitter lO
and transmitted to the slave station 60 on the control channel.

In the slave station 60 that receives the above information [4], its internal timing information detection circuit 6 detects the information, recognizes which call channel to use to adjust the time axis, and uses the time axis code. The generation circuit 5 transmits the predetermined code from the transmitter 3 to the upper station through the above communication channel.

When the receiver 9 of the relay station 50 receives the above code, the time axis code detection circuit 12 detects the time axis code from the output of the receiver a9 and transmits it to the time axis difference detection circuit 14. The time axis difference detection circuit 14 relays with the slave station 60 based on the unique time axis of its own relay station 50 outputted from the relay station time axis generation circuit 11 and the time axis code detected by the time axis code detection circuit 12. The difference in time axis between the station 50 and the station 50 is detected and transmitted to the conversion circuit 28.

The conversion circuit 28 converts the input time axis difference information into data for the slave station 60, and the determination circuit 26 converts the input time axis difference information into data for the slave station 60.
0, that is, when contact A of switch 30 is connected to contact B, the transmission timing designation circuit 29 operating independently in own station 50 The transmitter IO transmits the above data to the slave station 6 using the above communication channel of the designated radio circuit.
Send to 0.

The slave station 60 adjusts the time axis according to the transmitted data.

Note that when the determination circuit 26 of the relay station 50 detects a synchronization signal from the master station 40, that is, when the wireless line between the master station 40 and the relay station 50 is connected, the contact A of the switch 30 is connected to the contact C. Connect and receive! l! 116 and send 411
0 is connected, allowing the same time axis adjustment method and normal relay operation as in the past.

〔Effect of the invention·〕

As explained above, the relay station of the present invention operates independently at its own station, and includes a transmission timing specifying means for specifying to the slave station information on which communication channel of a wireless line is to be used for adjusting the time axis. , code detection means for detecting a time axis code transmitted from a slave station, and detecting the difference between the time axis of the slave station obtained from the time axis code detected by this detection means and the time axis of its own relay station. a time axis difference detection means for detecting a time axis difference, and a transmission means for transmitting data corresponding to the time axis difference detected by the time axis difference detection means to the slave station when a wireless line is not connected to the master station. This makes it possible for the relay station to specify the call channel to be used for time axis adjustment, as well as transmitting data corresponding to the time axis difference between the slave station and the relay station to the master station. It is now possible to transmit information to slave stations without any intervention, and therefore, even if the wireless line with the master station is not connected, if the wireless line is connected with the upper relay station, the time axis for that section can be adjusted. This makes it possible to efficiently perform tasks such as station installation and on-site adjustments that involve adjusting the time axis difference between slave stations and relay stations.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a main part of an embodiment of the present invention, FIG. 2 is a block diagram of a wireless communication system including a relay station to which the present invention is applied, and FIG. 3 is a block diagram of a conventional example. In the figure, 1.7, 18.19...Antenna 2.8.17.20...Shared device 3.10, 15.22...Transmitter 4.9, 16.21...Receiver 5... Time axis code generation circuit 6... Timing information detection circuit 11... Relay station time axis generation circuit 12... Time axis code detection circuit 14... Time axis difference detection circuit 23... Calculation Circuits 24.28... Conversion circuits 25.29... Output timing designation circuit 26... Judgment circuit 30... Swissochi 40... Master station 50... Relay station 60... Slave station

Claims (1)

[Claims] In a wireless relay device that relays time division multiplex communication between a master station and a plurality of slave stations, the wireless relay device operates independently in its own station and adjusts the time axis on which communication channel of the wireless line. transmission timing specifying means for specifying information to the slave station as to whether or not to perform the communication; determining means for determining whether or not a wireless line is connected to the master station; code detecting means for detecting a time axis code transmitted by the code detecting means, and detecting a difference between the time axis of the slave station obtained from the time axis code detected by the code detecting means and the time axis of the own wireless relay device. and a time base difference detection means that detects a difference in time base detected by the time base difference detection means, and transmits data regarding the time base difference detected by the time base difference detection means to the telephone call when the determination means determines that the base station and the wireless line are not connected. A wireless relay device comprising: a transmitting means for transmitting data to the slave station via a channel.