JPH0653944A - Line switching control system - Google Patents

Abstract

PURPOSE:To shorten a switching period of time to a standby line concerning to a line switching control system. CONSTITUTION:A standby line is shared by an A system having one standby line, and a B system having the different frame constitution of transmission data by switching a system changeover switch so that a transmission terminal parallel transmission signal from an A system line can be transmitted at the time of a normal operation, and the transmission terminal parallel transmission signal from a B system line can be transmitted at the time of the occurrence of the fault of the B system line. A line switching controller 3a is equipped with switching signal generating parts 34-1-34-n, and 34-1'-34-n' in which the system classification of the line to be in charge is set in advance, which output only a transmission terminal parallel switching control signal in the case of the A system, and output both the transmission terminal parallel switching control signal and a system switching control signal to switch the system changeover switch to the B system side in the case of the B system, at the time of receiving a switching activation instruction, and a switching logic processing part 31 which operates a switching logic judgement at the time of the occurrence of the fault of the line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line switching control system in a digital radio communication system in which two radio transmission systems each having a plurality of working lines and having different frame configurations share one protection line. .

[0002]

2. Description of the Related Art FIG. 4 is a block diagram of a wireless communication system to which the present invention is applied. Referring to FIG. 4, a conventional communication system having a plurality of working lines and one protection line and having the same frame structure for all lines is first described. A line switching control system in a digital wireless communication system will be described.

In the wireless communication system of system A shown in FIG.
1 to 1-n are the working wireless lines, 1-SP are the spare wireless lines,
Each wireless line sends a signal output by the line switching device 2a on the sending end side through a modulation / demodulation unit and a wireless transmission / reception unit (not shown), and receives a signal on the receiving end side via a wireless transmission / reception unit and a modulation / demodulation unit, Input to the line switching device 2b.

The line switching device 2a on the transmission end side includes transmission end parallel switches (TSW1 to TSWn) 22-1 to corresponding to the respective lines.
22-n, and operates by the transmission end parallel switching control signal to branch the transmission signal of the line in parallel to the protection line 1-SP. Then, in each line, a transmission side code conversion unit (TXDPU) 21 adds a line monitoring / control signal to form a frame suitable for wireless transmission, and the frame is transmitted to the wireless line. On the receiving end side, the signal received through the working line and the protection line is input to the receiving side code conversion unit (RXDPU) 24, and the monitoring / control signal is taken out. After that, the received signal from the protection line is distributed to each line by the receiving end changeover switches (RSW1 to RSWn) 24-1 to 24-n.

If a failure occurs on the working line, the receiving side code converter (RXDPU) 23 detects the deterioration or disconnection of the line supervisory signal and sends the information to the line switching controller 3b at the receiving end. The line switching control device 3b on the receiving end logically judges this information, and transmits a command to operate the TSW of the system to the line switching control device 3a on the sending end via the digital control line 4. Upon receiving this command, the line switching control device 3a on the sending end side turns on the corresponding sending end parallel switch TSW to send a signal in parallel to the protection line 1-SP.

On the receiving end side, the reception side code conversion unit (RXDPU) 23 of the standby line detects that a signal has normally flowed to the protection line and sends the information to the receiving end side line switching control device 3b. . The line switching control device 3b receives the information and operates the receiving end changeover switch RSW of the corresponding line. As a result, the output of the fault working line is switched to the received signal from the protection line.

Next, a conventional technique for sharing one protection line between two systems having different frame configurations, which is the subject of the present invention, will be described. In the figure, to the A system having the above-mentioned protection line, a B-system wireless communication system having no protection line and having a different frame structure in the wireless section from the A-system is added, and a plurality of B-system working lines 1-1 It is assumed that '~ 1-n' also share the protection line of system A.

Like the A system, the B system also has line switching devices 2a 'and 2b' at the transmitting and receiving ends, and switching control is performed by common line switching control devices 3a and 3b. A system changeover switch TSWSP for switching between the B system backup line transmission signal and the A system backup line transmission signal is provided before the backup line output of the A system transmission end side line switching device 2a.

When the B system having a different frame structure shares the protection line in this way, when a failure occurs in the working lines 1-1 'to 1-n' of the B system, transmission is performed via the protection line SP of the A system. End parallel transmission is performed, but the end parallel transmission signal from the B system is already B
Since the signal created in the B system frame by the transmission side code conversion unit (TXDPU) 21 'of the system is input, this signal is not passed through the transmission side code conversion unit (TXDPU) 21 of the A system and the protection line 1 -System changeover switch (TSWSP) 2 to enable direct transmission to SP
2-SP is provided.

On the receiving end side, the sending end parallel transmission signal received via the protection line 1-SP is branched into two and input to the receiving side code conversion units (RXDPU) 23, 23 'of the respective systems, and their own system is supplied. The monitoring / control signals are taken out in accordance with the frame structure of.

As described above, since the frame configurations of the A system and the B system are different, the sending end parallel signal of the B system cannot be handled in the same manner as the sending end parallel signal of the A system on the sending end side. When the system line is switched, the system changeover switch TSWSP, which is normally connected so as to transmit the A system transmission end parallel signal, is controlled to connect the backup line output of the B system to the backup line 1-SP.

[0012]

In the above-mentioned conventional line switching control system, the CPU of the line switching control unit determines by software which line is the working line to be switched. I also had to control the system changeover switch. That is, the CPU of the line switching device not only controls the parallel transmission end switch TSW of the line to be switched, but also determines whether the line to be switched is a line of A or B,
System switching switch TSWSP when switching the working line of system B
However, there is a problem that it takes time to switch the line, and the switching of the B-system line is not completed within a predetermined switching allowable time.

The present invention was created in view of the above problems, and it is an object of the present invention to shorten the line switching time when sharing one protection line between two types of wireless transmission systems having different frame configurations.

[0014]

FIG. 1 is a principle block diagram of a line switching control system of the present invention. As shown in Fig. 1, the above problems are caused by the A-system wireless transmission system having multiple working lines and one protection line, and the B-system wireless transmission having multiple working lines and having a different transmission data frame structure. In order to share the one protection line with the system, normally, the transmission end parallel transmission signal from the A line is sent to the protection line, and the transmission end parallel transmission signal of the B line is transmitted when the B line failure occurs. In a communication system in which a line changeover switch for changing over to a standby line is provided in a line changeover device of line A, if the line type to be in charge is preset by hardware and set to line A, , When the switching start command is received, it outputs the sending end parallel switching control signal for sending the transmission signal of its own line to the protection line, and when it is set to the B system, when the switching start command is received, the sending end parallel switching is performed. Control signal and before A switching signal generator 34-1 to 34-n, 34-1 'to 34-n' that is configured to output a system switching control signal that switches the system switching switch to the B system side and is provided for the line; The line switching control device 3a is provided with a switching logic processing unit 31 that makes a switching logic judgment when the line becomes a failure and sends the switching start command to the switching control signal generation unit corresponding to the switching target line. This is solved by the line switching control system of the present invention.

[0015]

When the switching logic processing unit receives the notification of the line failure, the switching logic processing unit makes a logical judgment only whether or not the transmission end parallel switching of the line is performed, determines the corresponding switching signal generating unit, and transmits the transmission end by the switching start command. Instructs parallel switch signal generation. The instructed switching signal generator outputs the transmission end parallel switching signal to the corresponding line and outputs or does not output the system switching control signal based on the system designation information set by the hardware.

Since it is not necessary for the switching logic processing section to judge which line the switching target line belongs to and to send out the system switching control signal, the line switching time can be shortened accordingly.

[0017]

Embodiments Embodiments will be described in detail below with reference to the accompanying drawings. FIG. 2 is a block diagram of a line switching control system of the present invention, and FIG. 3 is a diagram showing details of a switching signal generator.

The wireless communication system to which the system of the present invention is applied is the same as that described above with reference to FIG. 4, and the feature of the invention lies in the function of the line switching control device. To do.

In FIG. 2, reference numeral 3 is a line switching control device C
It has a switching logic processing unit 31 composed of a PU and an interface unit 32. The interface unit 32 receives a line failure alarm from the line switching device (in the case of a sending end, a parallel transmission request from the receiving end) and inputs it to the switching logic processing unit 31, and an alarm receiving unit 33 corresponding to the line. A plurality of switching logic processing units 31 are provided.
Switching signal generators 34-1 to 34-n, 34-1 'that generate switching control signals by the switching start command from and output to the line switching device
~ 34-n 'are provided.

Switching signal generators 34-1 to 34-n, 34-1 'to 34
-n 'is the system switching control signal line that outputs the system switching control signal line
35 and a parallel transmission end switching control signal line 36 for outputting a parallel transmission end switching control signal. The system switching control signal line 35 is wired or wired to the line switching device of system A (2a in FIG. 3) and in parallel. The transmission end switching control signal line 36 is connected to the line switching device of the system accommodating the corresponding line. Therefore, when the system switching control signal is output from any of the generating units, the system switching switch TSWSP (22-SP in FIG. 3) operates.

FIG. 3 is a diagram showing details of the switching signal generator. The switching signal generator 34 provided for the line includes a register 34a and relays 34b, AN corresponding to the number of types of switching control signals.
It is composed of a D gate 34c and a DIP switch 34d.

The register 34a is an 8-bit C from the CPU of the switching logic processing unit when the write pulse WN is active.
Takes in and latches a switch activation instruction sent via the PU bus. Then, of the data bits held in the register 34a, the output of the bit (eg, bit position [1]) corresponding to the sending end switching start instruction is branched into two, and one of them is a relay RTSW for generating the sending end parallel switching control signal. , And the other, via the AND gate 34c, generates a system switching control signal SP
Input to SWSP.

To the other side of the AND gate 34c, a system setting signal having a value of "0" or "1" is input according to the setting of the DIP switch 34d. The value of this system setting signal is set by setting the DIP switch 34d to ON and OFF according to the A system and B system of the line type to be handled by the switching control signal generator. For example, in the case of the switching signal generating section in charge of the B line, if the DIP switch 34d is set to OFF, the switching logic processing section issues a sending end parallel activation command whose first bit is "1". When written, relay RT
The SW operates to close the contact rTSW, and the ground air is sent to the sending end parallel control signal line 36, and at the same time, the relay RTSWSP also works to send the ground air to the system switching signal line 35.

Thus, when the switching signal generator is notified of the switching start command for sending end parallel, the switching signal generator automatically controls by hardware according to the line type for which transmission / non-transmission of the system switching control signal is set. Will be done.

Next, the switching operation will be described with reference to FIGS. First, in FIG. 4, when the line switching device 2b or 2b 'on the receiving side detects a fault in the working line of its own system, the alarm line of the line number of the line switching control device 3b on the receiving side is turned on and an alarm is issued. Notify the occurrence. Upon receiving the line alarm, the switching logic processing unit confirms that the protection line is normal and then performs the predetermined switching logic process and sends the sending end parallel request signal including the line number to be switched via the digital control line. It is transmitted to the line switching control device 3a on the end side. In FIG. 2 below, when the line switching control device 3a on the sending end receives the sending end parallel request signal, the switching logic processing unit 31 determines the use of the protection line in consideration of other factors, and the faulty line concerned. Switching signal generators 34-1 to 34-n, 34-1 'to 34
Notify the switch start command to -n '. Since the line type (A line or B line) of the line number that is controlled to be switched by the own switching signal generating unit is preset in each switching signal generating unit as described above, when the switching start command is notified, The switching signal generators 34-1 to 34-n in charge of the A-system line send the transmission-end parallel control signals for operating the transmission-end parallel switches TSW-1 to TSW-n of the A-system line to the A-system line switching device. Send out. Further, the switching control signal generators 34-1 'to 34-n' in which the B system is set send the system switching control signal SP to the A system line switching device 2a ', and
Transmission end parallel switch TSW-1 'of the line in charge of self-generation section
A switching control signal for operating TSW-n 'is sent to the B-system line switching device.

As described above, when the line to be switched is the A system, the system changeover switch does not operate and the transmission end parallel transmission signal is formed into a frame of the A system and sent to the protection line. Also,
When the line to be switched is the B system, the system changeover switch TSW-SP operates to send the transmission end parallel transmission signal of the B system frame configuration to the protection line.

Subsequent processing on the receiving end side is the same as in the prior art.

[0028]

As described above, according to the line switching control system of the present invention, the switching signal generator provided for the line autonomously generates the system switching control signal based on the system type setting information. Since the logic processing unit need only notify the switching start command and does not need to determine the line type and send out the system switching signal by software, there is an effect that the line switching time can be shortened.

[Brief description of drawings]

FIG. 1 is a principle configuration diagram of a line switching control system of the present invention.

FIG. 2 is a block diagram of an embodiment of the system of the present invention.

FIG. 3 is a detailed configuration diagram of a switching signal generator.

FIG. 4 is a configuration diagram of a wireless communication system to which the present invention is applied.

[Explanation of symbols]

1-1 to 1-n ... (A system) working line, 1-1 to 1-n ... (B system) working line, 1-SP ... Standby line, 2a, 2b, 2a ', 2b' ...
Line switching device, 3a, 3b ... Line switching control device, 22-1 to 22n,
22-1 '~ 22-n' ... Sending end parallel switch (TSW), 22-SP ... System changeover switch (TSWSP), 31 ... Changeover logic processing unit (CPU), 32
... Interface part, 33 ... Alarm receiving part, 34-1 to 34-
n, 34-1 ', 34-n' ... Switching signal generator

Claims (1)

[Claims] 1. An A-system wireless transmission system having a plurality of working lines and one protection line, and a B-system wireless transmission system having a plurality of working lines and having a different transmission data frame structure from the A-system. In order to share one backup line, normally, the sending end parallel transmission signal from the A system line is sent to the backup line,
In the communication system in which the line switching device of the A system is provided with a system changeover switch for switching the transmission end parallel transmission signal of the B system line to the protection line when the B system line fails, the system type of the line in charge is It is preset by the hardware, and if it is set to system A, it outputs the transmission end parallel switching control signal to send the transmission signal of its own line to the protection line when it receives the switching start command, and sets it to system B. Then, when the switching start command is received, the switching signal generation provided for the line is configured so as to output the sending end parallel switching control signal and the system switching control signal for switching the system switching switch to the B system side. Section (34-1 to 34-n, 34-1 'to 34-n') and the switching control signal generation section corresponding to the line to be switched by making a switching logic judgment when the line becomes a failure. Switching logic processing unit (31) that sends a switching start command Is provided in the line switching control device 3a, which is solved by the line switching control system of the present invention.