JPH05152995A - Transmission line monitoring/switching system - Google Patents

Abstract

PURPOSE:To shorten to the utmost a delay time from the generation of in deterioration a transmission line to execution of switching. CONSTITUTION:In the respective receiving parts 5c, 5r of an intermediate repeater station C and a receiving terminal station R, a deterioration amount of a transmission line S caused by fading is detected as a variation of a receiving input level, and also, whether the variation of the detected receiving input level exceeds a threshold or not is decided. Subsequently, a result of this decision of the intermediate repeater station C side is transferred to the receiving terminal station R side by a transmitting equipment 11, and based on a result of decision transferred from the intermediate repeater station C side, or a result of decision of the receiving terminal station R side, or circuit fault information outputted from a receiving code processing part 7r of the receiving terminal station R side, a transmitting terminal switch 1 and a receiving terminal switch 8 are controlled by switching controllers 14, 15, respectively, and one of the existing circuits L in which a fault is generated is switched to a stand-by circuit Lo in an early stage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a terminal line and one or more intermediate relay stations, one backup line and N lines.
The present invention relates to a transmission line monitoring switching method for performing control for switching from a working line to a protection line in a 1: N wireless communication system having a book working line.

[0002]

2. Description of the Related Art In the conventional switching control system of this type, the transmitting end switching device is first switched and then the receiving end switching device is switched according to the line fault information output from the reception code processing unit of the terminal station. I was switching from the line to the protection line.

[0003]

In the above-mentioned conventional switching control system, the line is switched by the line failure information output from the reception code processing unit, and the deterioration of the transmission line in each section due to fading is immediately caused. Since it does not appear in the line failure information, there is a problem in that there is a delay from the start of deterioration of the transmission line to the actual switching to the protection line.

The present invention has been proposed in order to solve the problems of the prior art, and the delay time from the deterioration of the transmission path to the switching at the receiving end can be minimized. An object is to provide a transmission line monitoring switching system.

[0005]

In order to achieve this object, the present invention provides a working line in which a transmitting terminal station and a receiving terminal station are connected by one or more intermediate relay stations via a transmission line. In a wireless communication system consisting of a protection line, in a switching control method that performs control to switch a working line in which a failure has occurred to a protection line, the amount of deterioration of the transmission line at each of the receiving units of the intermediate relay station and the receiving terminal station. Is detected by the amount of change in the received input level, a determination unit that determines whether the amount of change in the received input level detected by these detectors exceeds a threshold value, and a determination at the intermediate relay station side. Transfer means for transferring the judgment result outputted from the means to the receiving terminal station side, and the judgment result transferred from the intermediate relay station side or the judgment result outputted from the judging means on the receiving terminal station side or the receiving terminal station Side Based on the line failure information output,
The configuration includes a switching controller that controls switching between the transmitting end switching device and the receiving end switching device.

Further, according to the present invention, in each of the receiving portions of the intermediate relay station and the receiving terminal station, a detecting means for detecting the deterioration amount of the transmission line by the change amount of the receiving input level, and the receiving means detected by these detecting means. Determination means for determining whether or not the amount of change in the input level exceeds a threshold value, and transfer means for transferring the determination result output from the determination means on the intermediate relay station side to the transmitting terminal station side and the receiving terminal station side. , Transfer means for transferring the determination result output from the determination means on the receiving end station side to the transmitting end station side, and switching control for controlling switching of the transmitting end switcher based on the determination result transferred to the transmitting end station side Means and the determination result transferred to the receiving terminal station side or the determination result output from the determining means of the receiving terminal station side, the line failure information output from the receiving terminal station side is added, and based on these information The receiving end switch It is constituted and a switching control unit for switching control.

[0007]

According to the structure according to the above-mentioned claim 1, when the deterioration of the transmission line due to fading is detected in the receiving section on the side of the intermediate relay station or the receiving end station, the transmitting end switch is switched by the switching controller. And the receiving end switch is switched,
The working line in which the failure occurred is switched to the protection line.

According to the second aspect of the invention, when the deterioration of the transmission line due to fading is detected in the receiving section of the intermediate relay station or the receiving terminal station side, this detection information is received by the transmitting terminal station side. Transferred to the terminal side, the transmission terminal switching device is switched by the switching terminal side switching controller, the transmission path further deteriorates at the receiving terminal station side switching controller, and at the time when the line failure information is output, The receiving end switch is switched, and the working line in which the failure has occurred is switched to the protection line.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the transmission line monitoring switching system according to the present invention will be described in detail below with reference to the drawings. An example of this switching method is shown in the block diagram of FIG. In this figure, this system to which this transmission line monitoring switching system is applied constitutes a 1: N wireless communication system consisting of one protection line Lo and N working lines L, and each line is a transmission line. The terminal station T and the receiving terminal station R are connected via a transmission line S by one or more intermediate relay stations C.
With this transmission line monitoring switching method, when a line failure occurs on the transmission line S, one working line L can be switched to the protection line Lo without delay time.

Each of the lines L and Lo including the protection line has the same structure. Each transmission signal fetched from the input terminal IN is sent to the transmission code processing unit 2t via the transmission end switching unit 1, modulated by the modulation unit 3t, and then transmitted from the transmission unit 4t to the transmission line S. .. The receiving unit 5c of the intermediate relay station C receives the signals from the transmission line S,
These received signals are sent to the modulation section 3c via the demodulation section 6c, undergo modulation processing by the modulation section 3c, and then sent from the transmission section 4c to the transmission path S. In the receiving section 5r of the receiving terminal station R,
The signals sent from the relay station C are respectively received, these received signals are processed by the reception code processing unit 7r via the demodulation unit 6r, and the reception signals output from each reception code processing unit 7r are received end switch. Each of them is taken out from the output terminal OUT via 8. When the transmission path S is normal, the pilot signal generator 9 on the transmission terminal station T side is connected to the protection line Lo.
The pilot signal is transmitted from the terminal, and the pilot signal is detected by the pilot signal detector 10 on the receiving terminal R side.

When the transmission line S of one working line L deteriorates due to fading, the receiving section 5c of the intermediate relay station C
The deterioration amount of the transmission line S is detected as the change amount of the reception input level. When the receiving unit 5c determines that the detected amount of change exceeds a certain fixed value (threshold value), the switching request signal is switched from the switching request signal transmitting device 11 to the receiving terminal R side. The signal is sent to the request signal receiving device 12. Further, also in the receiving unit 5r on the receiving terminal station R side, when the deterioration amount due to the fading of the transmission path S is detected as the change amount of the reception input level, and it is determined that the detected level exceeds the threshold value, The switching request signal is input to the switching request signal receiving device 12. The switching request signal received by the switching request signal receiving device 12 is sent to the switching determination unit 13, and is logically ORed with the line fault information output from the reception code processing unit 7r. It is sent to the switching controller 15. When a switching request signal is input to the receiving end switching controller 15, the switching request signal is sent through the transmitting end switching controller 14 to the transmitting end switching device 1.
Sent to. As a result, the signal of one working line L whose quality has deteriorated is also passed through the protection line Lo and transmitted in parallel. At the same time, a switching request signal is sent from the receiving end switching controller 15 to the receiving end switching device 8, and one of the working lines L is switched to the protection line Lo. With this series of sequences, the working line L whose quality has deteriorated is rescued at an early stage.

When a line failure occurs due to a device failure that does not appear in the reception input level, the transmission terminal station T and the reception terminal station R are treated by the line failure information output from the reception code processing section 7r as in the conventional case. By switching the switching devices 1 and 8 on the side, the working line L is repaired.

Next, a transmission monitoring switching system of another embodiment shown in FIG. 2 will be described. In this figure, when the transmission line S of the working line L deteriorates due to fading, the reception unit 5c of the intermediate relay station C detects the deterioration amount of the transmission line S as a change amount of the reception input level, and this change level is When it is determined that the threshold value is exceeded, the switching request signal is transmitted from the switching request signal transmitting device 16c to the switching request signal receiving device 17 on the transmitting terminal station T side and the switching request signal receiving device 18 on the receiving terminal station R side. Sent out. Also, the amount of deterioration of the transmission path S due to fading is detected as the amount of change in the reception input level by the receiving unit 5r on the receiving terminal R side. Device 16
It is sent from r to the switching request signal receiving device 17 on the transmitting terminal station T side and the switching request signal receiving device 18 on the receiving terminal station R side.
When the switching request signal is input to the receiving device 17 on the transmitting terminal station T side, the switching request signal is sent to the switching controller 19, and the switching controller 19 switches the transmitting terminal switching device 1. Due to this, the quality is deteriorating 1
The signals of the one working line L are also passed to the protection line Lo, and the signals are transmitted in parallel. At the same time, the switching request signal is sent from the switching request signal receiving device 18 on the receiving terminal station R side to the switching controller 2
It is sent to 0 and enters the standby state. When the quality of the transmission line S further deteriorates and the line failure information is output from the reception code processing unit 7r to the switching controller 20 on the receiving end station R side, a switching request signal is sent from the switching controller 20 to the receiving end switch. 8 is sent. As a result, one of the working lines L becomes the protection line L.
The working line L whose quality is deteriorated is switched to o and is rescued.

The present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the invention.

[0015]

As described above, according to the present invention, when the switching control from the working line to the protection line is performed at the time of a line failure, the received input level information of each section is also used, so that the transmission line is faded. In case of deterioration of the line, it is possible to immediately switch to the protection line, and there is an effect that the line can be relieved at an early stage.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a transmission line monitoring switching system of another embodiment.

[Description of Codes] 1 transmission end switcher 2t transmission code processing unit 3t, 3c modulation unit 4t, 4c transmission unit 5c, 5r reception unit 6c, 6r demodulation unit 7r reception code processing unit 8 reception end switcher 9 pilot signal generator 10 pilot signal detector 11, 16c, 16r switching request signal transmitting device 12, 17, 18 switching request signal receiving device 13 switching determination device 14, 19 transmitting end switching controller 15, 20 receiving end switching controller

Claims (2)

[Claims] 1. A wireless communication system comprising a working line and a protection line connected between a transmitting terminal station and a receiving terminal station via a transmission line by one or more intermediate relay stations In a switching control method for performing control for switching a line to a protection line, in each of the receiving units of the intermediate relay station and the receiving terminal station, a detecting unit that detects the deterioration amount of the transmission line based on the change amount of the reception input level, The determination means for determining whether or not the amount of change in the received input level detected by these detection means exceeds the threshold value, and the determination result output from the determination means on the intermediate relay station side are transferred to the receiving terminal station side. Switching of the transmission end based on the transfer means and the judgment result transferred from the intermediate relay station side or the judgment result output from the judgment means on the reception terminal station side or the line failure information output from the reception terminal station side Line monitoring switching system and having a receiving end switching unit and each switching control for the switching controller with. 2. A wireless communication system comprising a working line and a protection line connected between a transmitting end station and a receiving end station via a transmission line by one or more intermediate relay stations In a switching control method for performing control for switching a line to a protection line, in each of the receiving units of the intermediate relay station and the receiving terminal station, a detecting unit that detects the deterioration amount of the transmission line based on the change amount of the reception input level, The determination means for determining whether or not the amount of change in the reception input level detected by these detection means exceeds the threshold value, and the determination result output from the determination means for the intermediate relay station side are used as the transmission terminal station side and the reception terminal side. Transfer means for transferring to the station side, transfer means for transferring the determination result output from the determining means on the receiving end station side to the transmitting end station side, and transmitting end based on the above determination result transferred to the transmitting end station side Switch changer The switching control means for controlling and the judgment result transferred from the receiving terminal station side or the judgment result output from the judging means on the receiving terminal station side to which the line failure information output from the receiving terminal station side is added. And a switching controller that controls switching of the receiving end switching device based on the information of 1.