KR100632975B1 - Remote for a digital optical mobile repeater network and method for automatic switching of an optical switch of the remote and method for self-recovery of the remote - Google Patents

Abstract

A remote of a mobile communication network optical repeater, a method for automatically restoring an optical switch switched in the same, and a self-diagnostic method of a transmission line in the same are provided to enable a selector to output a signal, inputted through the second input port, through an output port when errors occur, thereby automatically switching the optical switch during a signal failure as well as power fail and automatically restoring the optical switch by passing through a self-diagnostic process by using the switched optical switch. A remote(300) mobile communication network optical repeater comprises the followings: an optical switch(310); the first BD-OTRX(Bidirectional Optical Transmitter and Receiver)(321); the first SerDes(Serializer/Deserializer); a selector(381); the second SerDes(322); the first reframer(341); the second reframer(342); a sum unit(360); a framer(350); and a controller(370). In a normal state, the selector(381) outputs a low-speed parallel signal, outputted from the first SerDes, through the first input port and an output port. When errors occur, the selector(381) outputs a signal, inputted through the second input port, through the output port. The controller(370) is reported about the generation of a failure and converts states of the optical switch(310) and selector(381) when errors occur. Even in a self-diagnostic process for determining an auto recovery time point, the controller(370) receives a report about whether there are errors in each device and determines a point of time for automatically converting the optical switch(310) into a normal state.

Description

Method of automatic recovery of optical switch switched from remote of mobile communication network repeater and remote of mobile communication network repeater, Self-diagnosis method of transmission path from remote of mobile communication network optical repeater REPEATER NETWORK AND METHOD FOR AUTOMATIC SWITCHING OF AN OPTICAL SWITCH OF THE REMOTE AND METHOD FOR SELF-RECOVERY OF THE REMOTE}

1 is a network configuration diagram of a donor and a remote of a conventional base station and an optical repeater.

2 is a block diagram of a remote of the mobile communication optical repeater shown in FIG.

3 is a block diagram of a remote of a mobile communication optical repeater according to a first preferred embodiment of the present invention.

4 is a flowchart illustrating a method for automatically recovering an optical switch transferred from a remote according to the first embodiment of the present invention shown in FIG.

FIG. 5 is a table showing the state of the optical switch and the selector employed in the remote according to the first embodiment of the present invention shown in FIG.

6 is a block diagram of a remote of a mobile communication optical repeater according to a second preferred embodiment of the present invention.

FIG. 7 is a flowchart of a self-diagnostic method using a transmission path in a remote according to a second preferred embodiment of the present invention shown in FIG. 6.

FIG. 8 is a table showing the states of the optical switch and the first, second and third selectors employed in the remote according to the second embodiment of the present invention shown in FIG.

<Explanation of symbols for the main parts of the drawings>

100,300,700: Remote (connected remote)

200: Remote (terminated remote) 110,310,710: Optical switch

121,321,721: First two-way optical transmitter

122,322,722: second two-way optical transceiver

131,331,731: 1st parallel converter 132,332,732: 2nd parallel converter

141,341,741: Reframer 1 142,342,742: Reframer 2

150,350,750: Framer 160,360,760: Sum

170: switch controller 370, 770: management controller

381: selector 781: first selector

782: second selector 783: third selector

The present invention relates to an automatic recovery method using a switched optical switch in a remote (remote station) of a mobile communication network optical repeater.

In general, a mobile communication network is configured with an optical repeater for the purpose of reducing the number of BTS (Basestation Transceiver System) or to provide a good communication service in a radio shade area. 1 is a network configuration diagram of a donor (distribution station) and a remote of a conventional base station and an optical repeater. As shown in FIG. 1, the donor and the remote of the repeater installed in each radio shade area transmit and receive signals through a single optical path. The remotes are connected from the donor side to the connected remote (Intermediate Remote: a remote to which other remotes are connected to the upper end and the lower end) 100, and at the end thereof, the terminal remote is connected to the upper end only. The remote 200 connected to the other remote is connected.

2 is a block diagram of a remote of the mobile communication optical repeater shown in FIG. In particular, the configuration of the connected remote 100 is applied to the optical switch 110 to send and receive signals to the upper and lower ends of the remote. As shown in FIG. 2, the connected remotes receive the pay information data from the service area of the corresponding remote, add the signals from the lower end, convert them into optical signals, and send them to the upper end. 1 bidirectional optical transceiver 121, the first serial-parallel converter 131, the second serial-parallel converter 132, the second bi-directional optical receiver 122, the first reframer 141, the second reframer 142 , Framer 150, sum 160, and switch controller 170. In addition, the optical signal coming from the upper end is configured to extract the paid information data and transmit it to the corresponding service area and convert it into an optical signal and send it to the lower end via the optical switch 110.

However, when any one of the remotely connected connected remotes has a power failure, remotes below the power failure remote (remote farther from the base station) cannot transmit or receive signals. Therefore, when the failure of a power failure occurs, the conventional remote switches using the optical switch are replaced with the optical switch, so that only the remote can be excluded from the network, and the following remotes can continue to perform services. Restore the optical switch so that the remote can join the network and start the service.

However, in remote operation, signal failure may occur not only in power failure, but also in photoelectric conversion and all-optical conversion, and may not find frame synchronization for extracting pay information data. Even when such a signal failure occurs, the remote should be disconnected from the network for inspection, and after switching, the remote switch must be automatically repaired through its own diagnosis without the need for a separate monitoring device or personnel for repair. Skill is urgently needed.

The present invention has been made to solve the problems described above, the optical switch in the event of a signal failure that can not only find a power failure, but also a signal failure occurring in the photoelectric conversion or all-optical conversion process, and the frame synchronization for extracting the pay information data The object of the present invention is to provide a technology for automatically recovering a switched optical switch through a self-diagnosis process of a remote, including at least one selector, so as to forcibly switch over and recover the forced switched optical switch.

Remote of the mobile communication network optical repeater according to the present invention for achieving the above object, the first port connected to the upper end side, the third port connected to the lower end, normal operation to switch the direction of the optical signal input and output, normal operation At the time of having a fourth port and a second port connected to the first port and the third port, respectively, when the error occurs, the first port is directly connected to the third port to configure the bypass path and at the same time An optical switch connected to the fourth port to configure a self-diagnosis path; A first bidirectional optical transceiver for converting an optical signal input through the fourth port of the optical switch into a high speed multiple signal and outputting the converted high speed multiple signal into an optical signal and outputting the optical signal to a fourth port of the optical switch; A first serial parallel converter converting a high speed multiplex signal output from the first bidirectional optical transmitter into a low speed parallel signal, and converting the input low speed parallel signal into a high speed multiplex signal and sending the high speed multiplex signal to the first bidirectional optical transceiver; Having a first and second input port for receiving a signal and an output port selectively connected to any one of the first and second input port to output a signal, the output from the first serial-to-parallel converter in normal operation A selector for outputting the low speed parallel signal through the first input port and the output port, and outputting the signal input through the second input port through the output port when an error occurs; A second serial parallel converter converting the low speed parallel signal output from the selector into a high speed multiplexing signal and converting the high speed multiplexing signal into a low speed parallel signal; Converts the high speed multiplexed signal output from the second serial-to-parallel converter to an optical signal and sends it to the second port of the optical switch, and the optical signal from the second port of the optical switch is converted to a high speed multiplexed signal to convert A second two-way optical transmitter to a serial-to-parallel converter; A first reframer for outputting branch data by finding frame synchronization with a low speed parallel signal output from the first parallel converter; A second framer for extracting overhead and pay information data by finding frame synchronization with a low-speed parallel signal output from the second serial-to-parallel converter; Summing to output the combined paid data and the combined data extracted from the second reframer; A low speed parallel signal is output by forming a frame while adding an overhead to the signal output from the summation, and during normal operation, the low speed parallel signal is output, and when the error occurs, the output signal is sent to the first serial parallel converter. Framers each sent to a one-parallel converter and a second input port of the selector; And upon receiving a signal failure from at least one of the first and second two-way optical transmitters and the first and second reamers, and detecting an error, converts the state of the optical switch and the selector to the state at which the error occurs. And receiving and reporting whether an error occurs for each device in the self-diagnosis process using the self-diagnosis path of the optical switch, and determining an automatic recovery point to recover the optical switch.

The management controller is another feature of recovering the optical switch by determining the automatic recovery time by checking the bit error rate in the self-diagnosis signals coming into the first and second reframer during the self-diagnosis process.

In addition, a method for automatically recovering the optical switch switched from the remote of the mobile communication network optical repeater according to the present invention for achieving the above object, by forming a frame while adding overhead to the paid information data from the lower stage for self-diagnosis A self diagnostic signal generation step of generating a low speed parallel signal; The self-diagnosis signal generated in the self-diagnosis signal generation step is divided into an uplink diagnostic signal for checking whether an error occurs during uplink transmission and a downlink diagnostic signal for checking whether an error occurs during downlink transmission. Diagnostic signal splitting step; An uplink self diagnosis step of transmitting an uplink diagnosis signal divided in the self diagnosis signal division step to detect the occurrence of an error for each device; A downlink self diagnosis step of detecting whether an error occurs for each device by transmitting a downlink transmission diagnosis signal divided in the self diagnosis signal division step; An optical switch recovery step of recovering an optical switch switched to allow the corresponding remote to participate in a network if an error does not occur after monitoring an error occurrence from the uplink self diagnosis step and a downlink self diagnosis step; Characterized in that it comprises a.

In addition, the optical switch recovery step is characterized in that to recover the switched optical switch when the occurrence of the error is not detected for a predetermined time.

The optical switch recovery step may further include recovering a switched optical switch when the bit error rate is less than a predetermined error rate for a predetermined time by checking the bit error rate from the uplink self diagnosis step and the downlink self diagnosis step. It is done.

The uplink self-diagnosis step may include: a serial conversion step of converting a low speed parallel signal as an uplink diagnostic signal into a high speed multiplexed signal as a serial signal; An all-optical conversion and error detection step of converting a high speed multiple signal generated through the serial conversion step into an optical signal and outputting the optical signal, and detecting an error when the optical signal does not occur normally; A photoelectric conversion and error detection step of receiving the all-optical signal and converting the signal into a high-speed multiplex signal and outputting the same; A parallel conversion step of converting the photoelectrically converted high speed multiple signal into a low speed parallel signal; And a frame retrieval and error detection step of detecting an error when the frame synchronization is not obtained by extracting overhead and pay information data by receiving the low speed parallel signal converted through the parallel conversion step. Characterized in that it comprises a.

The downlink self diagnosis step may include: a serial conversion step of converting a low speed parallel signal as a downlink diagnostic signal into a high speed multiplexed signal as a serial signal; An all-optical conversion and error detection step of converting a high speed multiple signal generated through the serial conversion step into an optical signal and outputting the optical signal, and detecting an error when the optical signal does not occur normally; A photoelectric conversion and error detection step of receiving the all-optical converted signal and converting it into a high-speed multiplexed signal and detecting an error when an optical signal is input below a reference value; A parallel conversion step of converting the photoelectrically converted high speed multiple signal into a low speed parallel signal; And a frame retrieval and error detection step of detecting an error when the frame synchronization is not obtained by extracting overhead and pay information data by receiving the low speed parallel signal converted through the parallel conversion step. Characterized in that it comprises a.

On the other hand, the remote of the mobile communication network optical repeater according to the present invention for achieving the above object to switch the direction of the optical signal input and output, the first port connected to the upper end, the third port connected to the lower end, during normal operation Has a fourth port and a second port connected to the first port and the third port, respectively, and in case of an error, the first port is directly connected to the third port to configure a bypass path and simultaneously An optical switch connected to the fourth port; A first bidirectional optical transceiver for converting an optical signal input through the fourth port of the optical switch into a high speed multiple signal and outputting the converted high speed multiple signal into an optical signal and outputting the optical signal to a fourth port of the optical switch; A first serial parallel converter converting a high speed multiplex signal output from the first bidirectional optical transmitter into a low speed parallel signal, and converting the input low speed parallel signal into a high speed multiplex signal and sending the high speed multiplex signal to the first bidirectional optical transceiver; Having a first and second input port for receiving a signal and an output port selectively connected to any one of the first and second input port to output a signal, the output from the first serial-to-parallel converter in normal operation A first selector configured to output the low speed parallel signal through the first input port and the output port, and to output the signal input through the second input port through the output port during self-diagnosis; A second serial parallel converter converting the low speed parallel signal output from the first selector into a high speed multiplexing signal, and converting the high speed multiplexing signal into a low speed parallel signal; Converts the high speed multiplexed signal output from the second serial-to-parallel converter to an optical signal and sends it to the second port of the optical switch, and the optical signal from the second port of the optical switch is converted to a high speed multiplexed signal to convert the second signal. A second bidirectional optical transmitter receiving the parallel converter; A first framer for extracting overhead and pay information data by finding frame synchronization with a low-speed parallel signal output from the first serial-to-parallel converter; It has a first and second input port for receiving a signal and an output port that is selectively connected to any one of the first and second input port to output a signal, the output from the first lifter during normal operation A second selector for outputting the paid information data through the first input port and the output port, and wherein the output port is selectively connected to the first input port or the second input port according to a self-diagnostic method during self-diagnosis; A second framer for extracting overhead and pay information data by finding frame synchronization with a low-speed parallel signal output from the second serial-to-parallel converter; Having an input port for receiving a signal and first and second output ports selectively connected to the input port and outputting a signal, during normal operation, the pay information data output from the second reamer is inputted to the input port and A third selector for outputting through the first output port and outputting paid information data input through the input port through the second output port when an error occurs; Summing to sum and output the paid information data output through the first output port of the third selector and the combined data input; A low speed parallel signal is output by forming a frame while adding overhead to the signal output from the summation, and during normal operation, the low speed parallel signal is output to the first serial parallel converter. A framer for sending to the first input / parallel converter or the second input port of the first selector according to a diagnostic method; And receiving a signal failure signal from at least one of the first and second bidirectional optical transmitters and the first and second reamers, and detecting the state of the optical switch and the first and second selectors at the time of self-diagnosis. A management controller for switching to a state; It is another feature to include a.

In addition, the self-diagnostic method of the transmission line in the mobile communication network optical repeater according to the present invention for achieving the above object, the magnetic field to generate a low-speed parallel signal for self-diagnosis by forming a frame while adding an overhead to the combined data input; Diagnostic signal generation step; A serial conversion step of converting the low speed parallel signal generated in the self-diagnosis signal generation step into a high speed multiple signal which is a serial signal; An all-optical conversion step of converting the high-speed multiple signal generated through the serial conversion step into an optical signal and outputting the optical signal; A photoelectric conversion step of receiving the all-optical signal and converting it into a high-speed multiplexing signal; A parallel conversion step of converting the photoelectrically converted high speed multiple signal into a low speed parallel signal; A reframe step of receiving a parallel parallel signal converted through the parallel conversion step to find frame synchronization and extracting overhead and pay information data and outputting the same; And comparing and checking the pay information data output in the reframe step with the input combined data and checking the function of the corresponding remote unit. Characterized in that it comprises a.

Hereinafter, preferred embodiments will be described so that the present invention described above can be understood in more detail.

1 is a diagram illustrating a network between a donor and a remote of a conventional base station and an optical repeater, FIG. 2 is a diagram illustrating a remote of the mobile communication optical repeater shown in FIG. 1, and FIG. 3 is a diagram illustrating a preferred embodiment of the present invention. 4 is a flowchart illustrating a method for automatically recovering an optical switch transferred from a remote according to the first preferred embodiment of the present invention shown in FIG. 3, and FIG. 5 is shown in FIG. Table showing the state of the optical switch and the selector employed in the remote according to the first preferred embodiment of the present invention, Figure 6 is a configuration diagram for the remote of the mobile communication optical repeater according to the second preferred embodiment of the present invention, 7 is a flowchart of a self-diagnostic method using a transmission path from a remote according to a second preferred embodiment of the present invention shown in FIG. 6, and FIG. 8 is a limo according to a second preferred embodiment of the present invention shown in FIG. The state of the optical switch and the first, second, and third selectors employed in the illustrated table. For convenience of explanation, it is assumed that the left direction of the figure is the base station direction, that is, the upper end, and the right direction of the figure is the lower end.

<First Embodiment of Remote Control of Mobile Communication Network Optical Repeater>

As shown in FIG. 3, the remote 300 of the mobile communication network optical repeater according to the first embodiment of the present invention includes an optical switch 310 and a first bidirectional optical transmitter and receiver (BD-OTRX). 321, a first serial-to-parallel converter (SerDes: Serializer / Deserializer) 331, a selector 381, a second serial-to-parallel converter 332, a second two-way optical transceiver 322, a first reframer 341, a second framer 342, a sum (SUM) 360, a framer 350, a controller 370, and the like.

The optical switch 310 has a first port, a second port, a third port, and a fourth port through which signals are input and output, and in the normal operation, the first port connected to an upper end is connected to the fourth port, The third port connected to the stage is connected to the second port. If an error occurs, i.e., a power failure occurs or a signal failure is detected from the first and second bidirectional optical receivers 321 and 322 and the first and second reframers 341 and 342, the management controller 370 uses the optical switch ( The state of 310 is switched, and the first port is directly connected to the third port to form a bypass path so that the signals of the upper end and the lower end are not interrupted in transmission and reception, and the second port is directly connected to the fourth port. In connection, the self-diagnosis path for the recovery of the optical switch 310 is configured.

The first bidirectional optical transceiver 321 converts an optical signal input through the fourth port of the optical switch 310 into a high speed multiplex signal and sends the optical signal to the first serial-parallel converter 331, and the first serial-parallel. The high speed multiplex signal output from the converter 331 is converted into an optical signal and transmitted to the fourth port of the optical switch 310.

The first serial-parallel converter 331 converts the high-speed multiplexed signal output from the first bidirectional optical transceiver 321 into a low-speed parallel signal so as to input a first input of the first framer 341 and the selector 381. The low speed parallel signal output from the framer 350 is converted into a high speed multiplex signal and transmitted to the first bidirectional optical transmitter 321.

The selector 381 has a first input port, a second input port, and an output port. In normal operation, the selector 381 receives a low speed parallel signal output from the first parallel converter 331 as an input port. Output through and send to the second serial-to-parallel converter. If an error occurs, the output port of the selector 381 is connected to the second input port by the management controller 370.

The second serial-to-parallel converter 332 converts the low-speed parallel signal output through the output port of the selector 381 into a high-speed multiplexed signal and transmits the converted signal to the second bi-directional optical receiver 322, and transmits the second bi-directional light. The high speed multiplexed signal is received from the transceiver 322 and converted into a low speed parallel signal to be transmitted to the second framer 342.

The second bidirectional optical transceiver 322 converts a high speed multiplex signal output from the second serial-parallel converter 332 into an optical signal and transmits the optical signal to the second port of the optical switch 310, and the optical switch 310. The optical signal received from the second port of) is converted into a high speed multiplex signal and sent to the second serial-to-parallel converter 332.

The first reframer 341 outputs branch data by extracting overhead and pay information data by finding frame synchronization with a low speed parallel signal output from the first serial-parallel converter 331. The branch data is data sent to the service area managed by the corresponding remote.

The second reframer 342 searches frame synchronization for a low speed parallel signal output from the second serial-to-parallel converter 332, and extracts overhead and pay information data to output the sum 360.

The sum 360 is a device for combining and outputting the combined data which is the paid information data of the corresponding remote and the paid information data extracted from the second reamer 342. It is a device for sending the paid information data extracted from the signal of the lower stage entered through the two ports together with the combined data from the service area of the corresponding remote to the upper stage.

The framer 350 outputs a low speed parallel signal by forming a frame while adding overhead to the signal output from the sum 360. The low speed parallel signal generated by the framer 350 is divided and transmitted to the second input port of the first serial-parallel converter 331 and the selector 381, but in the normal operation, the second parallel input signal of the selector 381 is used. Since the input port is not connected to the output port, in fact, in normal operation, the low speed parallel signal is transmitted to all of the first parallel converter 331.

When an error occurs, the management controller 370 receives a report of a failure and switches the states of the optical switch 310 and the selector 381, and also, for each device in the self-diagnosis process for determining an automatic recovery point. It determines the time to transition to the normal operation state after receiving the error report. The figure shows that the management controller 370 is connected to each device, it will be understood by those skilled in the art that a plurality of management controllers are not operated separately as shown.

Errors that may occur at a remote in operation may include power failures and signal failures. Signal failure refers to Loss of Signal (LOS), Loss of Frame (LOF), and LD Diode (Laser Diode Bias) failure.

Loss of signal is a signal disorder that occurs when an optical signal is input below a reference level when an optical signal is input from the fourth and second ports of the optical switch 310 to the first and second bidirectional optical receivers 321 and 322. That is, when an optical signal is input below the reference value, the first or second two-way optical transceivers 321 and 322 that detect the error signal are reported to the management controller 370, and the management controller 370 that has received the error occurrence is reported. ) Switches the optical switch 310 and the selector 381 to a state when an error occurs.

Frame sync loss is an error that occurs when frame sync is not found in the first and second reframers 341 and 342 to extract overhead and pay information data. In other words, if the frame synchronization is not obtained, the first or second framer 341, 342 that detects the error is reported to the management controller 370, and the management controller 370 that has received the error occurrence is reported. The optical switch 310 and the selector 381 are switched to a state when an error occurs.

The LD bias fault is an error that occurs when the optical signals are not normally generated when the first and second bidirectional optical transceivers 321 and 322 convert the high speed multiplex signals to optical signals. That is, when the optical signal is not normally generated, the first or second two-way optical transceivers 321 and 322 which have sensed this report the fact that an error has occurred to the management controller 370, and the management controller 370 that has received the error occurrence is reported. The switch switches the optical switch 310 and the selector 381 to a state when an error occurs.

5 is a table showing a connection state of each port of the optical switch 310 and the selector 381 during normal operation and when an error occurs. Each connection state of the optical switch 310 and the selector 381 is controlled by the management controller 370.

When the optical switch 310 is switched due to a power failure or a signal failure, a self-diagnosis process for automatic recovery is performed by using the self-diagnosis path of the switched optical switch 310, and an error is detected for a predetermined time. If not, the management controller 370 restores the optical switch 310 to re-join the remote, which has been separated from the network, to the network. That is, the first port and the fourth port of the optical switch 310 are connected, and the third port and the second port are connected. In addition, the management controller 370 converts the connection state of the selector 381 into a state where the first input port and the output port are connected.

The management controller 370 checks the bit error rate in the self-diagnosis signals introduced into the first and second reframers during the self-diagnosis process, and if the bit rate is higher than a predetermined bit error rate, the management controller 370 does not join the remote to the network even if there is no error such as a signal failure. It is more desirable to be able to perform self-diagnosis again for a certain time. This is to strictly determine the recovery conditions to prevent the recovery and transfer of the optical switch 310 is repeated.

Hereinafter, a description will be given of a method of automatically recovering the switched optical switch when the optical switch of the remote of the above-mentioned mobile communication network optical repeater is switched.

<Method for Automatic Recovery of the Optical Switch Switched from the Remote According to the First Embodiment>

First, a method of automatically recovering an optical switch transferred from a remote according to the first embodiment will be described with reference to FIG. 4. The self-diagnosis process in which the following descriptions are performed should be reminded that the remote 300 is switched, that is, the state of the optical switch 310 and the selector 381 is in error.

1. Self-diagnosis signal generation step <S410>

A frame is formed while adding overhead to the paid information data from the lower stage to generate a low speed parallel signal for self diagnosis. The self-diagnosis signal refers to a signal generated by the framer 350.

2. Self-diagnosis signal splitting step <S420>

From the self-diagnosis signal generated in the self-diagnosis signal generation step <S410> to an uplink diagnostic signal for checking whether an error occurs during uplink transmission and a downlink diagnostic signal for checking whether an error occurs during downlink transmission Divide.

Referring to the configuration of the above-described remote 300 shown in FIG. 3, the signal generated by the framer 350 is connected to a node to which the first serial-to-parallel converter 331 and the second input port of the selector 381 are connected. It is inherited. However, in the normal operation, the second port of the selector 381 is not connected to the output port, so that the signal generated by the framer 350 is only sent to the first serial-to-parallel converter 331. However, when an error occurs, the second input port of the selector 381 may be connected to an output port to transmit a signal. Therefore, although the low-speed parallel signal, which is a self-diagnosis signal generated by the framer 350, may be sent to the first serial-parallel converter 331 (uplink diagnostic signal for checking whether an error occurs during uplink transmission), Through the second input port and the output port of the selector 381, the second serial-parallel converter 332 is also sent to a side (downlink diagnostic signal for checking whether an error occurs during downlink transmission). will be.

3. Uplink self diagnosis step <S430a> and downlink self diagnosis step <S430b>

The self-diagnosis signal splitting step <S420> transmits the divided uplink diagnostic signal to detect whether an error occurs for each device. At the same time, the downlink diagnostic signal divided by the self-diagnosis signal splitting step <S420> is transmitted to detect whether an error occurs for each device. An error detection process for each device using the uplink diagnostic signal and the downlink diagnostic signal is performed at the same time, and the devices to be processed during the transmission process also coincide. That is, the apparatus through which the uplink diagnostic signal passes through the first serial-parallel converter 331, the first two-way optical transceiver 321, and the second two ports passing through the fourth and second ports of the switched optical switch 310. The optical receiver 322, the second serial-to-parallel converter 332, and the second reframer 342, which are subjected to the downlink diagnostic signal, pass through the second input port and the output port of the selector 381 to the second device. Serial-to-parallel converter 332, the second two-way optical receiver 322, the first two-way optical transceiver 321, the first parallel and parallel converter 331 through the second port and the fourth port of the switched optical switch 310 ) And the first reframer 341.

3-1. Serial conversion step <S431a, S431b>

The first and second serial-parallel converters 331 and 332 convert low-speed parallel signals, which are uplink and downlink transmission diagnostic signals, into high-speed multiplexed signals, which are serial signals.

3-2. All-optical conversion and error detection steps <S432a, S432b>

The first and second bidirectional optical transmitters 321 and 322 convert the high speed multiple signals generated through the serial conversion steps S431a and S431b into optical signals and output the optical signals. When the optical signals do not occur normally, an error is detected. Report to the management controller 370.

3-3. Photoelectric conversion and error detection steps <S433a, S433b>

The second and first bidirectional optical transmitters 322 and 321 receive the all-optical converted optical signals through the all-optical conversion and error detection steps <S432a and S432b>, and convert them into high-speed multiplexed signals. Error is detected and reported to the management controller 370.

3-4. Parallel conversion step <S434a, S434b>

The second and first serial-to-parallel converters 332 and 331 convert the photomultiplexed high speed multiplexed signals into low speed parallel signals through the photoelectric conversion and error detection steps <S433a and S433b>.

3-5. Reframe and error detection steps <S435a, S435b>

The second and first reframers 342 and 341 receive the low speed parallel signals converted through the parallel conversion steps <S434a and S434b> to find frame synchronization, extract overhead and pay information data, but have not obtained frame synchronization. Time error is detected and reported to the management controller 370.

4. Optical switch recovery step <S440>

The presence of an error is monitored from the uplink self diagnosis step <S430a> and the downlink self diagnosis step <S430b>. If an error such as signal failure occurs in the all-optical conversion and error detection steps <S432a and S432b>, the photoelectric conversion and error detection steps <S433a and S433b> and the reframe and error detection steps <S435a and S435b>, The self-diagnosis process is repeated. In addition, the optical switch 310 is switched only when a bit error rate within a predetermined limit is detected by detecting a bit error rate from the signals input to the first and second reframers 341 and 342 through the self-diagnosis process. To recover. That is, even if an error of a signal failure does not occur, when the bit error rate of a predetermined limit or more occurs, the optical switch 310 is not restored, so as to prevent repeated recovery and transfer of the optical switch 310. The omission of the bit error rate detection process does not necessarily fall within the scope of the present invention. If no error occurs for a predetermined time and a bit error rate is detected below the reference bit error rate, the optical switch which is switched to allow the remote to participate in the network is recovered.

Second Embodiment of Remote Control of Mobile Communication Network Optical Repeater

As shown in FIG. 6, the remote 700 of the mobile communication network optical repeater according to the second embodiment of the present invention includes an optical switch 710, a first two-way optical transceiver 721, and a first serial-to-parallel converter 731. ), A first selector 781, a second serial-to-parallel converter 732, a second bidirectional optical receiver 722, a first reframer 741, a second selector 782, a second reframer 742, And a third selector 783, sum 760, framer 750, management controller 770, and the like. The configurations are similar to those of the remote 300 according to the first embodiment, but the function of the remote is checked by checking the branch data output by looping the combined data input from the service area along the signal path. The second selector 782 and the third selector 783 are further included as a necessary configuration. Therefore, the description overlapping with the first embodiment will be avoided, and the description will focus on the second selector 782 and the third selector 783 further configured in the remote 300 of the first embodiment. Do it. In addition, the first selector 781 has the same function as the selector 381 employed in the remote 300 of the first embodiment, but only the name is changed due to the addition of a plurality of selectors.

The second selector 782 has a first port and a second port receiving a signal, and an output port selectively connected to any one of the first port and the second port to output a signal. In normal operation, the pay information data output from the first reframer 741 is output through the first input port and the output port, and during self-diagnosis, the output port is connected to the first input port according to a self-diagnosis method. Or selectively connected to a second input port.

The third selector 783 has an input port for receiving a signal and a first output port and a second output port selectively connected to the input port to output a signal. In the normal operation, the pay information data output from the second framer 742 is output through the input port and the first output port, and the pay information data input through the input port is self-diagnosed. Output through the output port.

The connection state of the ports of the first selector 781, the second selector 782, and the third selector 783 is controlled by the management controller 770.

Unlike the first embodiment, the second embodiment generates a self-diagnosis signal using combined data (Add Data) input from the service area of the corresponding remote, and also through the branch data (Drop Data) output to the corresponding service area. It is a device configured to check the status of the remote.

That is, in normal operation, the input port of the third selector 783 is connected to the first output port, and the pay information data output from the second reframer 742 is sent to the sum 760. This is equivalent to the sum 360 of the second reframer 342 of the first embodiment.

In the normal operation, the first input port of the second selector 782 is connected to an output port to output branch data, which is paid information data, from the first reframer 741, which is the first embodiment described above. For example, the first reframer 341 extracts the paid information data and exports it as branch data.

The more accurate operation and control method of the second selector 782 and the third selector 783 will be made clear by the self-diagnosis method according to the second embodiment to be described below.

<Self-diagnosis method of transmission line in remote according to the second embodiment>

First, a transmission path self-diagnosis method in the remote 700 according to the second embodiment will be described with reference to FIG. 7. In the self-diagnosis process in which the above description is performed, the states of the optical switch 710 and the first, second, and third selectors 781, 782, and 783 of the remote 700 are at the time of self-diagnosis. In addition, the transmission path self-diagnosis method in the remote 700 according to the second embodiment to be described includes a method of checking through an uplink and a method of checking through a downlink. Since this is the same, only the checking method through the uplink will be described. That is, the a symbol after each step is to indicate that it is a check method through the uplink.

1. Self-diagnosis signal generation step <S810a>

A low speed parallel signal is generated for self-diagnosis by forming a frame while adding overhead to the combined data, which is paid information data coming from the service area of the remote. The self-diagnosis signal refers to a signal generated by the framer 750. In the method of checking the uplink transmitter, the self-diagnosis signal generated by the framer 750 is transmitted to the first serial-parallel converter 731. Of course, when the first selector 781 performs the self-diagnosis, the second input port and the output port may be connected to each other to perform the downlink transmission device inspection by passing the self-diagnosis signal. Since the output port of the second selector 782 is connected to the second input port, that is, the first input port of the second selector 782 through the first reframer 741 during the downlink transmission device inspection process. Since the signal input as cannot pass through the second selector 782, it is assumed that the self-diagnosis signal generated by the framer 750 is input only to the first serial-parallel converter 731. The connection state between the ports of the optical switch 710 and the first, second and third selectors 781, 782 and 783 employed in the remote 700 according to the second embodiment is shown in FIG.

3. Serial conversion step <S820a>

The first serial-parallel converter 731 converts a low-speed parallel signal, which is a self-diagnosis signal, into a high-speed multiplexed signal, which is a serial signal.

4. All-optical conversion step <S830a>

The first bidirectional optical transceiver 721 converts and outputs a high speed multiplex signal generated through the serial conversion step <S820a> into an optical signal.

5. Photoelectric conversion stage <S840a>

The second bi-directional optical receiver 722 receives an all-optical converted optical signal through an all-optical conversion step <S830a> and converts the converted optical signal into a high-speed multiplexing signal.

6. Parallel conversion step <S850a>

The second serial-to-parallel converter 732 converts the high-speed multiplex photoelectrically converted signal through the photoelectric conversion step <S840a> into a low-speed parallel signal.

7. Reframe step <S860a>

The second framer 742 receives the low speed parallel signal converted through the parallel conversion step <S850a>, finds frame synchronization, and extracts and outputs overhead and pay information data.

8. I / O signal comparison check step <S870a>

The branch data, that is, the paid information data output in the reframe step and the combined data input from the service area of the corresponding remote are compared and checked to determine whether the function of the corresponding remote is normal. This can be determined by the user analyzing the spectrum of the combined data and the branch data.

Although only the self-diagnostic method through the uplink check has been described above, the processes to be performed in the self-diagnostic method through the downlink check, that is, the second input port and the output port of the framer 750 and the first selector 781 Passing through the second serial-to-parallel converter 732, the second two-way optical receiver 722, the second port and the fourth port of the switched optical switch 710, the first two-way optical transceiver 721, the first direct The process of going through the first input port and the output port of the parallel converter 731, the first reframer 741, and the second selector 782 to the branch data is the same, and only the connection state of the second selector 782 is connected. Since only the change, the description of the self-diagnosis method through the downlink check will be omitted.

The transmission path self-diagnosis method according to the second embodiment as described above can be used as a test method for producing a remote and determining whether it operates normally. In addition, when a remote failure occurs, it can be disconnected from the network and the function can be tested through the transmission path self-diagnosis method according to the second embodiment.

As described above, the detailed description of the present invention has been made by the embodiments with reference to the accompanying drawings. However, since the above-described embodiments have only been described by way of example, the present invention is limited to the above embodiments. It should not be understood that the scope of the present invention is to be understood by the claims and equivalent concepts described below.

As described in detail above, the present invention has the following effects.

First, not only power failure but also signal failure, that is, signal loss (LOS) that occurs when an optical signal below the standard is input, frame synchronization loss (LOF) that occurs when frame synchronization is not obtained, and LD bias failure that occurs when the optical signal does not occur correctly. The optical switch can be automatically forcibly transferred even in the event of signal failure.

Second, by performing the self-diagnosis process using the self-diagnosis path of the forcibly switched optical switch, it is possible to automatically recover the switched optical switch when the signal disturbance disappears.

Third, by checking the bit error rate through the self-diagnosis process, by restoring the switched optical switch only when a bit error occurs within a predetermined limit, it is possible to prevent the repetition and recovery of the optical switch frequently.

Fourth, by further comprising a second selector and a third selector, and by comparing and analyzing the combined data and branch data input and output through the uplink device check and downlink device check, it is possible to check the function of the remote.

Claims (9)

The first port connected to the upper end side, the third port connected to the lower end side, and the fourth port and the second port connected to the first port and the third port, respectively, in normal operation. An optical switch having a port, in case of an error, the first port is directly connected to a third port to configure a bypass path, and the second port is connected to the fourth port to form a self-diagnosis path; A first bidirectional optical transceiver for converting an optical signal input through the fourth port of the optical switch into a high speed multiple signal and outputting the converted high speed multiple signal into an optical signal and outputting the optical signal to a fourth port of the optical switch; A first serial parallel converter converting a high speed multiplex signal output from the first bidirectional optical transmitter into a low speed parallel signal, and converting the input low speed parallel signal into a high speed multiplex signal and sending the high speed multiplex signal to the first bidirectional optical transceiver; Having a first and second input port for receiving a signal and an output port selectively connected to any one of the first and second input port to output a signal, the output from the first serial-to-parallel converter in normal operation A selector for outputting the low speed parallel signal through the first input port and the output port, and outputting the signal input through the second input port through the output port when an error occurs; A second serial and parallel converter converting the low speed parallel signal output from the selector into a high speed multiplexing signal and converting the high speed multiplexing signal into a low speed parallel signal; Converts the high speed multiplexed signal output from the second serial-to-parallel converter to an optical signal and sends it to the second port of the optical switch, and the optical signal from the second port of the optical switch is converted to a high speed multiplexed signal to convert the second signal. A second bidirectional optical transmitter receiving the parallel converter; A first reframer for outputting branch data by finding frame synchronization with a low speed parallel signal output from the first parallel converter; A second framer for extracting overhead and pay information data by finding frame synchronization with a low-speed parallel signal output from the second serial-to-parallel converter; Summing to output the combined paid data and the combined data extracted from the second reframer; A low speed parallel signal is output by forming a frame while adding an overhead to the signal output from the summation, and during normal operation, the low speed parallel signal is output, and when the error occurs, the output signal is sent to the first serial parallel converter. Framers each sent to a one-parallel converter and a second input port of the selector; And Upon receiving a signal failure from at least one of the first and second bidirectional optical transmitters and the first and second reamers, and detecting an error, the state of the optical switch and the selector is changed to a state when an error occurs. In the self-diagnosis process using the self-diagnosis path of the optical switch, receiving and reporting whether the error occurs for each device, the management controller to determine the automatic recovery time to restore the optical switch; Remote. The method of claim 1, The management controller of the mobile communication network optical repeater, characterized in that the self-recovery signal entered into the first and second reframer in the self-diagnosis process to check the bit error rate to determine the automatic recovery time to restore the optical switch. A self-diagnostic signal generation step of generating a low speed parallel signal for self-diagnosis by forming a frame while adding overhead to the paid information data from the lower stage; The self-diagnosis signal generated in the self-diagnosis signal generation step is divided into an uplink diagnostic signal for checking whether an error occurs during uplink transmission and a downlink diagnostic signal for checking whether an error occurs during downlink transmission. Diagnostic signal splitting step; An uplink self diagnosis step of transmitting an uplink diagnosis signal divided in the self diagnosis signal division step to detect the occurrence of an error for each device; A downlink self diagnosis step of detecting whether an error occurs for each device by transmitting a downlink transmission diagnosis signal divided in the self diagnosis signal division step; An optical switch recovery step of recovering an optical switch switched to allow the corresponding remote to participate in a network if an error does not occur after monitoring an error occurrence from the uplink self diagnosis step and a downlink self diagnosis step; Method for automatically recovering the optical switch transferred from the remote of the mobile communication optical repeater comprising a. The method of claim 3, The optical switch recovery step, the automatic switch of the optical switch transferred from the remote of the optical repeater, characterized in that for recovering the optical switch is switched when the occurrence of the error is not detected for a predetermined time. The method of claim 3, The optical switch recovery step, Checking the bit error rate from the uplink self-diagnosis step and the downlink self-diagnosis step, and when the bit error rate is less than a predetermined error rate for a predetermined time, the switch is switched from the remote of the mobile communication network optical repeater How to automatically recover the optical switch. The method of claim 3, The uplink self-diagnosis step, A serial conversion step of converting a low speed parallel signal as an uplink diagnostic signal into a high speed multiple signal as a serial signal; An all-optical conversion and error detection step of converting a high speed multiple signal generated through the serial conversion step into an optical signal and outputting the optical signal, and detecting an error when the optical signal does not occur normally; A photoelectric conversion and error detection step of receiving the all-optical converted signal and converting it into a high-speed multiplexed signal and detecting an error when an optical signal is input below a reference value; A parallel conversion step of converting the photoelectrically converted high speed multiple signal into a low speed parallel signal; And A reframe and error detection step of detecting an error when frame synchronization is not obtained by extracting overhead and pay information data by receiving frame parallel signal converted through the parallel conversion step; Method for automatically recovering the optical switch transferred from the remote of the mobile communication optical repeater comprising a. The method of claim 3, The downlink self diagnosis step, A serial conversion step of converting a low speed parallel signal, which is a downlink diagnostic signal, into a high speed multiple signal, which is a serial signal; An all-optical conversion and error detection step of converting a high speed multiple signal generated through the serial conversion step into an optical signal and outputting the optical signal, and detecting an error when the optical signal does not occur normally; A photoelectric conversion and error detection step of receiving the all-optical converted signal and converting it into a high-speed multiplexed signal and detecting an error when an optical signal is input below a reference value; A parallel conversion step of converting the photoelectrically converted high speed multiple signal into a low speed parallel signal; And A reframe and error detection step of detecting an error when frame synchronization is not obtained by extracting overhead and pay information data by receiving frame parallel signal converted through the parallel conversion step; Method for automatically recovering the optical switch transferred from the remote of the mobile communication optical repeater comprising a. The first port connected to the upper end side, the third port connected to the lower end side, and the fourth port and the second port connected to the first port and the third port, respectively, in normal operation. An optical switch having a port, wherein in case of an error, the first port is directly connected to a third port to configure a bypass path, and the second port is connected to the fourth port; A first bidirectional optical transceiver for converting an optical signal input through the fourth port of the optical switch into a high speed multiple signal and outputting the converted high speed multiple signal into an optical signal and outputting the optical signal to a fourth port of the optical switch; A first serial parallel converter converting a high speed multiplex signal output from the first bidirectional optical transmitter into a low speed parallel signal, and converting the input low speed parallel signal into a high speed multiplex signal and sending the high speed multiplex signal to the first bidirectional optical transceiver; It has a first and second input port for receiving a signal and an output port that is selectively connected to any one of the first and second input port to output a signal, the output from the first serial- parallel converter during normal operation A first selector configured to output the low speed parallel signal through the first input port and the output port, and to output the signal input through the second input port through the output port during self-diagnosis; A second serial parallel converter converting the low speed parallel signal output from the first selector into a high speed multiplexing signal, and converting the high speed multiplexing signal into a low speed parallel signal; Converts the high speed multiplexed signal output from the second serial-to-parallel converter to an optical signal and sends it to the second port of the optical switch, and the optical signal from the second port of the optical switch is converted to a high speed multiplexed signal to convert the second signal. A second bidirectional optical transmitter receiving the parallel converter; A first framer for extracting overhead and pay information data by finding frame synchronization with a low-speed parallel signal output from the first serial-to-parallel converter; It has a first and second input port for receiving a signal and an output port that is selectively connected to any one of the first and second input port to output a signal, the output from the first framer in normal operation A second selector for outputting paid information data through the first input port and the output port, and wherein the output port is selectively connected to the first input port or the second input port according to a self-diagnostic method during self-diagnosis; A second framer for extracting overhead and pay information data by finding frame synchronization with a low-speed parallel signal output from the second serial-to-parallel converter; It has an input port for receiving a signal and the first and second output ports selectively connected to the input port for outputting a signal, so that the pay information data output from the second reamer during the normal operation of the input port and A third selector for outputting through the first output port and outputting paid information data input through the input port through the second output port during self-diagnosis; Summing to sum and output the paid information data output through the first output port of the third selector and the combined data input; A low speed parallel signal is output by forming a frame while adding overhead to the signal output from the summation, and during normal operation, the low speed parallel signal is output to the first serial parallel converter. A framer for sending to the first input / parallel converter or the second input port of the first selector according to a diagnostic method; And At the time of self-diagnosis of the state of the optical switch and the first, second and third selectors when there is a signal failure by receiving a signal failure from at least one of the first and second bidirectional optical transmitters and the first and second reframers. A management controller for switching to the; Remote of the mobile communication network optical repeater comprising a. A self diagnostic signal generation step of forming a frame while adding overhead to the input combined data to generate a low speed parallel signal for self diagnosis; A serial conversion step of converting the low speed parallel signal generated in the self-diagnosis signal generation step into a high speed multiple signal which is a serial signal; An all-optical conversion step of converting the high-speed multiple signal generated through the serial conversion step into an optical signal and outputting the optical signal; A photoelectric conversion step of receiving the all-optical signal and converting it into a high-speed multiplexing signal; A parallel conversion step of converting the photoelectrically converted high speed multiple signal into a low speed parallel signal; A reframe step of receiving a parallel parallel signal converted through the parallel conversion step to find frame synchronization and extracting overhead and pay information data and outputting the same; And An input / output signal comparison checking step of comparing and checking the paid information data outputted from the reframe step and the inputted combined data to check a function of the corresponding remote; Self-diagnosis method.

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