JPH0380632A - Changeover/control system with priority for digital radio line including drop/insertion station - Google Patents

Abstract

PURPOSE:To attain changeover control of (N+1) lines by quickening relief operation of lines including drop/insertion stations (D/I stations). CONSTITUTION:One or plural D/I stations B are provided between terminal stations A and C and (N+1) digital radio lines are constituted while including the terminal stations A, C and the D/I stations B. For example, assuming a line between the terminal station A and the D/I station B, between the terminal station C and the D/I station B as a short line and a line between the terminal stations A and C as a long line, then the D/I station B applies drop or insertion to a required line only. Then a fault of the short lines is relieved by applying conventional changeover procedure and a fault in the long line is relieved by connecting a standby line of each D/I station. In the case of a duplicate fault, L/S (long/short) priority circuits 17,18 provided to the terminal stations A, C are used for relief with priority. Thus, the changeover control of (N+1) lines including the D/I stations is attained.

Description

[Detailed description of the invention] [Table of contents] Overview Industrial field of application Prior art (Figure 8) Means for solving the problems to be solved by the invention (Figure 1) Working examples (Figure 2) ~Figure 7) Effects of the invention [Summary] Regarding the priority switching control method for digital wireless lines including drop/insertion stations, the relief operation of D/I stations is sped up, and the D/I stations in the digital wireless system are N
The aim is to enable switching control of the +1 line, prioritize long/short lines, and reduce the cost of the system. A D/I station is provided to configure an N+1 line digital wireless line, and each terminal station and D/I station is provided with a line switching control unit. A long/short priority circuit is installed in the D/I station, and the D/I station uses the normal switching procedure to relieve short line failures, and in the case of long line failures, the line switching control unit connects the backup line of the 071 station. In addition, if faults in long lines and short lines occur at the same time, the L/S prioritizing circuit prioritizes and rescues line faults.

[Industrial application field]

The present invention relates to a priority switching control system for digital wireless lines including drop/insertion stations, and more specifically, in digitalized and large-capacity communication lines, the present invention relates to a priority switching control system for digital wireless lines including drop/insertion stations, and more specifically, in communication lines that have been digitalized and have increased capacity, small-to-medium-sized cities or municipalities with small-to-medium-sized capacity lines are With the introduction of wireless systems, long (LONG) lines including drop/insertion stations and short (SHOPT) lines, which have been required to realize low cost wireless systems,
) This invention relates to a priority switching control system for a digital radio circuit including a drop/insertion station, which enables high-speed switching in the event of a line failure and high-speed priority switching control.

[Conventional technology]

FIG. 8 is an explanatory diagram of an N+1 line switching control method using a terminal relay method in conventional digital wireless communication.

In the figure, TR indicates a radio transmitting/receiving device, MD indicates a radio modulation/demodulation device, SW indicates a radio line switching device (TSW indicates a transmitting side switch, R3W indicates a receiving side switch), and MUX indicates a carrier end station device.

Conventionally, in digitalized and large-capacity communication lines, when bringing small and medium-sized capacity lines to small and medium-sized cities, etc.,
When relaying is performed using a terminal device and only necessary lines (for example, telephone lines) are dropped or inserted at the relay station, the configuration shown in FIG. 8 is used.

A signal from terminal station A is relayed at terminal station B and sent to terminal station C. In this case, at the B station, the signal is received by the radio transmitter/receiver TR, demodulated by the radio modulator/demodulator MD, and then passed through the radio line switching device SW and enters the carrier terminal device MUX.

Here, some lines are dropped from the DMUX, the remaining lines become relay lines, and the MUX, SW, MD, and TR
The signal is sent to terminal station C via .

Furthermore, when transmitting a signal from station 0 to station A via station B, the signal is transmitted through the reverse route to the above.

At that time, part of the line is dropped from the DMUX.

When inserting a signal, insert it. Send the signal to the MUX, and send it from station B to station A or station 0.

[Problem to be solved by the invention]

The above-mentioned conventional devices had the following drawbacks.

(1) It is possible to use a terminal station as a relay station and drop or insert a part of the line at the relay station, but in this case, the wireless line switching device (SW) of the relay line or the carrier terminal ) is large, the entire system becomes large and expensive.

(2) When connecting terminal stations to small and medium-sized cities, a method without using terminal relay stations was considered, but this was not possible due to the complexity of line control and the difficulty of reducing the cost of the system. .

The present invention solves these conventional drawbacks, and in addition to digital wireless lines configured between normal terminal stations, drop/
By speeding up the repair operation of the line including Inser 937 station (D/I station),
The purpose is to enable switching control of N+1 lines, including 71 stations, to prioritize long/short lines, and to reduce the cost of the system. .

[Means to solve the problem]

FIG. 1 is a principle diagram of a priority switching control system for a digital wireless line including 937 drop/inser stations according to the present invention, where LCN is a line switching control unit, 17.18 is an L/S
(Long/Short) Shows the priority circuit.

One or more drop/inser 937 stations (hereinafter simply referred to as rD/I stations) are installed between terminal stations A and C, and these terminal stations A, C and 071 station are installed. This constitutes a digital radio line of N+1 lines (one protection line for multiple working lines).

In the illustrated example, between terminal station A and D/I station B, and between D/■ station B
There is a short (SHOPT) line between terminal station A and terminal station C, and a long line between terminal station A and terminal station C, and D/I station B drops or inserts only the necessary number of times.

In a digital radio line including such a /r station, a short line failure can be relieved by a normal switching procedure.

However, in the event of a failure in the long line, the protection line of each 071 station is connected as follows to provide relief.

When terminal station C detects that a fault has occurred on the long line, the line switching control unit LCN checks the use status and alarm status of the backup line between B and C, and if the line is normal and not in use. For example, a line switching control signal (
Hereafter simply rswc.

(referred to as NTJ).

D/I station B, which received this 5WCONT, learns of the long line failure in the line switching control unit LCN, and
I check the reserve of A-B, which is the preceding section of station B, and if it is normal and unused, sends 5WCONT toward B-A.

At the same time, the backup switch of the B station is connected, and the response signal of the backup switch is sent to B-C.

When terminal station A receives 5WCONT, it controls the corresponding sending end switch, connects the sending end in parallel (cuts off the pilot signal and connects to the protection line), and sends a receiving end switch control command as 5WCONT in the A-B direction. .

When D/I station B receives 5W CONT, it relays the long side information. Furthermore, when station 0 receives this 5WCONT, it confirms that there is a backup switch response from station B and rescues the working line as a backup.

Through these procedures, D/I
Relief can be provided by the station's backup line.

In this way, line failures include long line failures and short line failures, and although each can be repaired as described above, double failures of long and short lines may occur.

In case of such double failure, L
/S (Long/Short) Priority circuit 17.18 prioritizes and rescues. This priority is set in advance by manual operation or the like.

For example, suppose that a long line fault occurs, and the long line is repaired as a backup as described above, but in the middle of this, a short line fault occurs between terminal station A and D/I station B.

In this case, the line switching control unit LCN of the D/I station B transmits failure information of one line to the terminal station C.

When the terminal station C receives the short line failure information in addition to the long line failure information, the L/C in the line switching control unit LCN
The S priority assigning circuit 17 makes a determination and assigns priority.

At this time, if the setting is long line priority, the long line will remain rescued by the reserve, but if short line priority is set, the long line relief will be canceled and the short line will be rescued. .

(Function) As mentioned above, in long line switching control, the question was how to send the preliminary switch response of the D/■ station to the receiving end station at high speed.
By placing it on top of T (line switching control signal), the command (receiving end switch drive command) from the transmitting end station is sure to arrive before the command (receiving end switch drive command) reaches the receiving end station.

Therefore, it is possible to secure the same level of switching time as normal line switching control between one terminal station.

In addition, even if a double fault of long and short occurs, it can be rescued by prioritizing it according to the priority set in advance, and even if the rescue is performed with such priority, it will not be possible to solve the problem at the level described above. High-speed switching is possible.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. Second
7 to 7 are diagrams showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram of a digital wireless line including 071 stations, where S is a short line, L is a long line, and TSWI
, TSW2 is a sending end switch, ESW1 and ESW2 are receiving end switches, and ESW is a standby switch.

A long line is formed between terminal station A and terminal station C, and terminal station A and D/
A short line is formed between the I station B and between the D/I station B and the terminal station C, respectively.

In the illustrated example, there is one D/I station B, but this is not limited to one station, and a plurality of stations can be installed. When a plurality of 071 stations are provided between the terminal station A and the terminal station C, short lines are formed between the terminal station and the D/T station, and between the 071 stations and the 071 stations.

Then, the terminal stations A, C, and one or more stations will admonish 07.
1 station to form a digital radio line of N+1 lines (one protection line for a plurality of working lines).

FIG. 3 is a block diagram of the 071 station, where TR is a radio transmitting/receiving device, MD is a radio modulation/demodulation device, SW is a radio line switching device, MUX is a carrier end station device, TSW is a sending end switch,
ESW indicates a receiving end switch.

At the D/I station, the wireless transmitter/receiver T is connected via the antenna AT.
The data received by R is demodulated by radio modulation/demodulation device MD.

At this time, only the necessary lines are drawn into the drop/insertion processing unit DIP and dropped. The remaining lines excluding this dropped line are treated as trunk lines,
It is modulated again by the radio modulation/demodulation device MD, and then sent to the radio transmitting/receiving device T.
It is transmitted from R via antenna AT.

In addition, the data inserted from the 071 station is transmitted to the carrier terminal device MU of the drop/insertion processing unit DIP.
It is inserted from X and sent to the other station.

FIG. 4 is a block diagram of the L/S (I prefix circuit), in which 20 is a selector, 21 is an alarm determination section, 22 is a priority assignment section, and 23 is a priority setting switch.

This L/S (long/short) priority circuit is provided in the line switching control section in the terminal station, and is not provided in the 071 station.

First, when a line fault occurs and a line alarm (CHO to CHN) is input to this L/SaE prefix circuit, the alarm determination section 21 distinguishes whether it is a long alarm or a short alarm.

The data outputted from the alarm determining section 21 is prioritized by the priority setting switch 23 by determining the priority order (long priority or short priority) set in advance in the prioritizing section 22.

That is, the prioritizing section 22 determines whether to switch the long line or the short line, and sends an output signal to the selector 20.

The selector 20 performs a selection operation based on the signal from the prioritizing section 22, and outputs the channel number to be rescued among the line alarms (CHO to CHN).

Figure 5 is a block diagram of the embodiment, Figure 6 is 5WCONT.
FIG. 3 is a diagram showing the format of (line switching control signal).

This example shows a case where one D/I station B is provided between terminal station A and terminal station C, and in each of these stations, only the configuration inside the line switching control unit (see Figure 1) is shown. It is.

In the figure, 1.7.16 is the sending data processing unit, 3.6
．． 13.14 is a signal determination section, 2.4.12.15 is a switching processing section, 17.18 is an L/S priority circuit, and 5.8.9.
Reference numeral 11 indicates a line switching switch.

In the present invention, in order to reduce the cost of wireless systems when introducing small and medium-sized capacity lines to small and medium-sized cities or municipalities in digitalized and large-capacity communication lines, only the necessary lines are provided. The system is configured to include a layered D/I station that drops or inserts.

In such a system, it is important how quickly and accurately the D/I station can make a backup connection when a failure occurs.

This is due to the fading phenomenon peculiar to radio (100 d
It is necessary to follow the situation (the incoming call status changes at a rate of B/sec) and rescue the faulty line at high speed (within approximately 10 m5 ec).

The terminal station A is provided with a transmission data processing section 1, a switching processing section 2, and a signal determination section 3, and the switching processing section 2 includes an L/S
(Long/Short) A priority path 18 is provided.

Similarly, the terminal station C is provided with a transmission data processing section 16, a switching processing section 15, and a signal determination section 14, and also has a switching processing section 15.
An L/S priority assigning circuit 17 is provided inside.

Further, the D/I station B is provided with a switching processing section 4.12, a signal determining section 6.13, a sending data processing section 17.10, and a line switching switch 5.8.9.1. This switch 5
．． 8.9.11 controls signal transfer based on logical judgment (it is an intermediate of long signals).

In the above configuration, when saving the long line between terminal stations AXC, the important points are how to connect the protection line of DAM station B to the long line side, and how to transmit this information to the receiving terminal station. Become.

For this purpose, 5WCONT was made into a formant as shown in Figure 3. The signal is composed of short line data, long line data, and line identification data.

Line identification data includes flags to distinguish between long lines and short lines (for example, L=I, S
= O).

For short lines, data RO for transmitting end switch control, data HA for receiving end switch control, data d for backup operation for transmission (OCCT), and backup operation for reception (○CCR).
data, line test data (TEST DRV,
It consists of TEST ANS) and t.

For long lines, D/I station backup switch response data, data for sending end switch control, data for receiving end switch control, preliminary operation data for transmission, preliminary operation data for reception, and line test data are used. Data (TEST
It consists of data for DRV, TEST ANS), power, and parity check.

Next, the rescue procedure for long line switching will be explained.

(11) Suppose that terminal station C detects a long line failure between terminal stations A and C.

(2) When the terminal station C detects a fault in the working line (long line), the switching processing unit 15 checks the use status and alarm status of the protection line between the preceding sections B and C.

As a result, if the protection line is normal and unused, the sending data processing unit 16 generates 5WCONT1 (5WCONT signal sent in the C-B-A direction), and from the terminal station C to the D/I station B.
Send towards. In this case, the data (L/S) for A is long line rL=IJ.

(3) D/I station B is 5W CONTi from terminal station C.
is received and judged by the signal judgment unit 13.

As a result, when first focusing on the first flag and detecting the long line flag (L=1), the switching processing unit 4 switches the front section of D/I station B, that is, the protection line between A and B. Check whether it is normal and unused.

When it is confirmed that the data is normal and unused, the sending data processing unit 7
From there, 5WCONT1 is sent to terminal A in the same manner as above. At the same time, D/■Station B's spare switch ESW
(see FIG. 2), and further sends out the response signal 5WCONT2 from the standby switch from the D/I station B to the terminal station C.

The operation at this time is that at the same time SWC○NTI is sent to terminal station A, preliminary switch response 5WCONT2 is sent to terminal station C.
This is an important point for high-speed switching.

(4) At the terminal station A, 5WCONT1 is received from the D/I station B, and the corresponding transmission end switch T is sent to the switching processing unit 2.
Controls the SW and connects the sending end in parallel (switching from the pilot to the protection line).

Then, check the response signal of the sending end switch TSW,
The receiving end switch control command (No in Figure 6) is 5WCONT2.
It is sent from terminal station A to D/I station B as follows.

(51D/I station B uses the 5WC sent from terminal A.
When the ONT 2 is received, the signal is judged by the signal discriminator 6 and the long side information is relayed.

(6) Terminal station C receives 5WCONT2 from D/I station B, and the signal determination unit 14 determines it.

As a result, if the received signal is a null signal (receiving end switch drive command), it is confirmed that there is a preliminary switch response from D/I station B.

That is, it is confirmed that the protection line is connected to the long side, and the working line (long line) is saved to the protection line.

In this way, the operation of saving the working line to the protection line is completed.

FIG. 7 is a switching flowchart when a double failure occurs in a long line and a short line.

Suppose now that a failure occurs in the long line (50).

At this time, the long line is rescued as a protection line as described above (51).

Next, suppose that a fault occurs in the short line between terminal station A and D/T station B, for example (52).

This failure is detected at D/I station B, and failure information is transmitted from D/I station B to terminal station C (53).

Terminal C receives not only the long line failure but also the short line failure (54). In the terminal station C, after receiving the fault information in the switching processing unit 15, the fault information (line alarm) is sent to the L/S prioritization circuit 17, and the channel number to be prioritized and rescued is determined (55). .

At this time, if the long line is prioritized, the long line is saved as a protection line (56), and if the short line is still in trouble when the long line is restored, the short line is saved as a protection line.

However, if short circuit priority is given, terminal station C uses the receiving end switch R3WI (see Figure 2), which was saving the long line.
Cut back (57).

Next, terminal station C instructs terminal station A and D/T station B to perform short line relief (58).

This instruction is sent to the sending data processing section 16 of the terminal station C.
This is done by activating WCONT and sending it to D/I station B and terminal station A.

When the D/I station B receives the 5W CONT, the signal determining section 13 determines this and switches back the backup switch ESW according to the instruction from the switching processing section 12 (59).

The terminal station A receives 5WCONT, and the signal determining section 3 determines the received signal. As a result, the switching processing unit 2 selects the sending end switch T.
SW1 is switched back (60).

Thereafter, in the terminal station A, the transmitting end switch TSW2 is set to the standby side in order to relieve the short circuit (61).

When this sending end switch TSW2 is turned on, the sending data processing unit 1 creates 5WCONT (TSWANS), Tsw
The D/I station B is informed that the number 2 has entered (62).

When the D/I station B receives the 5WCONT, the signal determination section 6 determines the signal, and the switching processing section 4 selects the receiving end switch R3W2.
Enter (63).

As a result, the short line between terminal station A and D/I station B is saved as a protection line (64).

However, if the long line is still in trouble after the short line is restored, the long line will be saved as a backup line.

〔Effect of the invention〕

As explained above, the present invention has the following effects.

(In the line switching control of the N+1 line including IID/I stations, when a long line fault between terminal stations occurs, line switching control can be performed at the same high speed as the conventional rescue operation between one terminal station, and the recovery can be performed.

An N+1 line digital radio system including +21D/r stations can be realized as an inexpensive system.

(3) In the conventional system, when relaying using a terminal station,
Wireless line switching equipment (SW) of relay lines and carrier terminal equipment (
MUX), but the present invention eliminates the need for these and allows the system to be miniaturized.

(4) Prioritized switching between long lines and short lines can be performed in the same switching time as normal line switching control between terminal stations.

Therefore, there is no distinction between a system including D/I and a conventional system that includes only terminal stations, and system prices can be reduced for medium and small capacity data transmission.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the present invention, FIGS. 2 to 7 are diagrams showing one embodiment of the present invention, FIG. 2 is an explanatory diagram of a digital radio line including a D/I station, and FIG. The figure is a block diagram of the D/I station, Figure 4 is a block diagram of the L/S priority circuit, Figure 5 is a block diagram of the embodiment, Figure 6 is the format of the line switching control signal, and Figure 7 is the L/S priority circuit.
/32 Switching Flowchart in Case of Severe Failure, FIG. 8 is an explanatory diagram of the conventional terminal station relay system. 17, l l1l-L/S priority circuit L CN'-
-Single line switching control unit patented person Fujitsu Limited

Claims (1)

[Claims] Between the terminal station (A) and the terminal station (C), there is one drop/insertion station (D/I station) with a station configuration that drops or inserts only necessary lines. (B), or by setting up multiple stations and setting up one protection line for multiple working lines (N+
1 line) constitutes a digital wireless line, and the terminal station (A,
C) and drop/insertion stations are each equipped with a line switching control unit (LCN), and the line switching control unit (LCN) of the terminal station (A, C) is equipped with a long line switch for relief in the event of a line failure. An L/S (long/short) prioritization circuit (17, 18) is provided to prioritize whether to give priority to the short line or short line. A short line failure between insertion stations is relieved by the normal switching procedure, and a long line failure between end stations (A, C) is resolved by the line switching control unit (LCN), which uses the backup line of the drop/insertion station. In addition, if long line and short line failures occur simultaneously, the above L/S priority circuit (17, 18) prioritizes and relieves line failures. A priority switching control method for a digital wireless line including a drop/insertion station, characterized in that: