JPH077458A - Radio transmission system - Google Patents

Abstract

PURPOSE:To provide a radio transmission system based upon a line switching system capable of sharing a line switching control part and having high frequency using efficiency. CONSTITUTION:The transmitting side is provided with the 2nd line switching means 31 for inputting outputs from the 1st line switching means 11T to 14T and inputting a signal from any one of lines to a stand-by line SCH1 and a line switching control part 32 for switching the 1st and 2nd line switching means based upon one line switching information. The receiving side is provided with a distributer 34 for distributing a signal outputted from the stand-by line SCH1 to plural receiving side line switching means 11R to 14R, line alarm detectors 21 to 24 for outputting a line alarm when the line quality of any one of working lines CH1 to CH4 is deteriorated and a line switching information generating circuit 33 for outputting information indicating the input of a line alarm from one of the detectors 21 to 24 to its corresponding receiving side line switching means as line switching information. The output of the circuit 33 is transmitted to the control part 32 through a radio line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless transmission system by a line switching system for switching a working line to a protection line when a failure occurs in an arbitrary working line in digital radio communication, and particularly, a signal having a different transmission capacity is transmitted. The present invention relates to a line switching system in which one spare line is used when a failure occurs.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional example. In this example,
Each of the N (= 2) working channels CH1 and CH2 and CH3 and CH4 is configured with one protection line. That is, there are M protection lines SCH11 and SCH12 for M (= 2) types of signals.

The line switching operation will be briefly described.
When all working lines are normal, none of the working lines are switched to the protection lines on the sending end side, so pilot signals from the pilot signal generators 101 and 102 are transmitted. On the receiving end side, pilot signal detectors 103, 104
Is detected to detect that no working line has been switched to the protection line, that is, that all working lines are normal and the protection line is also normal.

Here, for example, fading is caused by working line C.
When the error occurs in H1 and an error occurs in the line, the line alarm detector 21 counts the error. Then, when it exceeds a preset threshold value, a line alarm is output to the line switching information generating circuit 106. The line switching information generation circuit 106 transmits the line alarm as line switching information to the line switching control unit 105 using the wireless line in the direction of the transmission end side.

Upon receiving this information, the line switching control unit 105 outputs a line switching control signal to operate the line switching means 11T to transfer the signal of the working line CH1 to the protection line SCH1.
Replace with 1. Further, the response signal is transmitted by using the wireless line to the receiving end side. Therefore, on the receiving end side, when the pilot signal detector 103 detects that the pilot signal has disappeared, that is, one of the working lines is switched on the transmitting end side, a signal indicating this is sent to the line switching information generating circuit. To 106.

Upon receiving this signal and the response signal from the receiving end, the line switching information generating circuit 106 outputs the information to the line switching means 11R of the working line CH1. When the line switching means 11R receives this signal, it detects the phase difference between the signals and when the phases match, the protection line SCH1
All operations are completed by switching to the 1 side.

Even when fading occurs on the working lines CH2, CH3, and CH4, the same operation is used for relief.

[0008]

As described above, in the conventional method, each of the N working lines is composed of one protection line. That is, for M kinds of signals, M
Since there are individual protection lines, the frequency utilization efficiency is poor. Further, since the conventional wireless transmission system is composed of completely independent M types of systems, M line switching control units are required.

Therefore, it is an object of the present invention to provide a radio transmission system by a line switching system which can share a line switching control unit and has high frequency utilization efficiency.

[0010]

A wireless transmission system according to the present invention is a wireless circuit for transmitting M kinds of signals (M is a natural number of 2 or more) having different transmission capacities, and N (for each signal of the transmission capacities) N is a natural number of 2 or more)
A first line switching means on the transmission side provided for each working line on the sending end side, and M types of these first line switching means are provided. Second line switching means on the transmission side for inputting an output and inputting a signal of any one of the M types to the protection line, and the first line switching means and the second line switching means as one line One line switching control unit for switching according to switching information, and on the receiving end side, a plurality of receiving side line switching units provided for each working line corresponding to the first line switching unit, and the protection line. Distributors for distributing the signals from the plurality of receiving side to the line switching means of the plurality of receiving sides, and M × N number of MsN units for monitoring the line quality of each working line and outputting a line alarm of the working line when the line quality deteriorates. The line alarm detector and the M × N line alarm detectors When each output is input and a line alarm is input, one line switching information generating circuit that outputs the information as line switching information to the corresponding line switching means on the receiving side is provided. It is characterized in that the output of the circuit is transmitted to the line switching control unit on the sending end side by using a wireless line.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows an embodiment of a wireless transmission system according to the present invention.
Shown in. Also in this embodiment, as in the example of FIG. 2, M = 2 and N =
2 is shown, and the same parts are denoted by the same reference numerals. As can be seen from the figure, in a wireless line that transmits two kinds of signals with different transmission capacities, the signals with the respective transmission capacities respectively correspond to two working lines CH1, CH2 and CH3, CH4 and 2 × 2 working lines. Has one protection line SCH1. At the transmission end side, two first line switching means 11 on each transmission side
T, 12T and 13T, 14T and two types of outputs of these first line switching means are input, and the signal of any one of the two types is input to the protection line SCH1 and the second line of the transmission side Switching means 31 and the first line switching means 11
T and 12T or first line switching means 13T and 14T
It has a line switching control unit 32 for switching the signal according to one line switching information, and pilot signal generators 101 and 102.

On the receiving side, the line switching means 11R, 12R, 13R, 14R on the receiving side provided for each working line corresponding to the first line switching means on the transmitting side and the respective line qualities are monitored. 2 × 2 line alarm detectors 21, 22, 23, 2 that output the line alarm when the line quality deteriorates
4, a line switching information generating circuit 33 which outputs the respective outputs of these line alarm detectors and outputs the information as line switching information, and the pilot signal detectors 103 and 104. The output of the line switching information generating circuit 33 is transmitted to the line switching control unit 32 on the sending end side using a wireless line.

Here, for example, when fading occurs in the working line CH1 and an error occurs in the line, the line alarm detector 21 counts the error, and when it exceeds a preset threshold value, a line alarm is sent to the line switching information. Output to the generation circuit 33. The line switching information generation circuit 33 transmits the line alarm as line switching information to the line switching control unit 32 using the wireless line in the direction of the sending end. Upon receiving this information, the line switching control unit 32 outputs a switching control signal,
By operating the first line switching means 11T and the second line switching means 31, the signal of the working line CH1 is transferred to the protection line SCH1.
Then, the data is transmitted to the distributor 34. Further, the response signal is transmitted by using the wireless line to the receiving end side.

On the receiving end side, the pilot signal detector 103
When it is detected that the pilot signal has disappeared, that is, one of the working lines has been switched on the sending end side, a signal indicating this is output to the line switching information generating circuit 33.
The line switching information generating circuit 33 which receives this signal and the response signal from the receiving end side is the line switching means 1 of the working line CH1.
The information is output to 1R. When this signal is input, the line switching means 11R detects the phase difference between the signals from the distributor 34 and switches to the backup line SCH1 side when the phases match and completes all operations.

Even when fading occurs on the working lines CH2, CH3, and CH4, the same operation is used for relief.

[0016]

As described above, since one line switching control unit is sufficient for M × N working lines and only one protection line is provided, a radio transmission system with high frequency utilization efficiency can be provided. .

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a wireless transmission system according to the present invention.

FIG. 2 is a block diagram showing an example of a conventional wireless transmission system.

[Explanation of symbols]

 11T to 14T First line switching means on transmission side 11R to 14R Line switching means on receiving side 31 Second line switching means on transmission side 21 to 24 Line alarm detector 101, 102 Pilot signal generator 103, 104 Pilot signal Detector 32,105 Line switching control unit 33,106 Line switching information generation circuit

Claims (2)

[Claims] 1. A wireless line for transmitting signals of different transmission capacities of M types (M is a natural number of 2 or more), and N (N is a natural number of 2 or more) working lines and M for each signal of each transmission capacity. A first line switching means on the transmission side provided for each working line on the sending end side, and M types of these first line switching means are provided. Second line switching means on the transmission side for inputting an output and inputting a signal of any one of the M types to the protection line, and the first line switching means and the second line switching means as one line One line switching control unit for switching according to switching information, and on the receiving end side, a plurality of receiving side line switching units provided for each working line corresponding to the first line switching unit, and the protection line. The signal from is distributed to the line switching means on the plurality of receiving sides. A line alarm detector for monitoring the line quality of each working line and outputting a line alarm for the working line when the line quality deteriorates, and the above M × N line alarm detectors. A line switching information generating circuit for outputting the respective outputs and, when a line alarm is input, outputting the information as the line switching information to the corresponding line switching means on the receiving side. Is transmitted to the line switching control unit on the sending end side using a wireless line. 2. The wireless transmission system according to claim 1, wherein
The transmitting end side is further provided with M pilot signal generators for outputting pilot signals to the N working lines, and the receiving end side corresponds to the M pilot signal generators. Equipped with M pilot signal detectors, when the pilot signal from the transmitting end disappears, it is detected that one of the working lines is switched and a signal indicating that is output to the line information generating circuit. A wireless transmission method characterized by: