JPH0247140B2 - KAISENKANSHIHOSHIKI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a line monitoring method, and in particular, to a method for monitoring a line, and in particular, for monitoring a plurality of burst-like data arranged in chronological order within a specific time frame with an occupied time zone etc. specified in advance. The present invention relates to an improvement of a line monitoring system in a time division multiplex communication line formed by a plurality of stations including a predetermined line monitoring control station and a plurality of slave stations using a predetermined line monitoring control station as an intermediary means.

(Prior Art) As part of a multiplex communication system, a time division multiplex communication system in which one frequency band is used in a time-division manner in a plurality of stations is being put into practical use as an extremely powerful system in various communication application fields. For example, TDMA (Time Division Multiple Access)
As shown in FIG. 1, in a satellite communication line based on this system, for example, a line monitoring control station 4 is installed in areas corresponding to radiation beams 10 and 11 of antennas 2 and 3 mounted on a communication satellite 1. and slave stations 5, 6, a line monitoring control station 7, and slave stations 8, 9 are arranged, and the satellite communication Lines are formed efficiently. Although the example in FIG. 1 shows a case where one line monitoring control station and two slave stations are installed in each area corresponding to the communication satellite 1, in general, The number of line monitoring and control stations installed in each area may be two, and the number of slave stations is not limited to two, but a plurality of stations may be installed.

In the above-mentioned TDMA satellite communication line, in order to operate the line smoothly, the line monitoring and control station monitors the transmission status of burst data sent from multiple slave stations, and checks each burst type. It is necessary to perform operational monitoring control, including initial connection control as a means of newly joining data to the communication line, and steady synchronization control to monitor and control the transmission status of each burst once it has joined the communication line. be.

In this TDMA satellite communication line,
If a failure occurs in the operational functions related to the above-mentioned initial connection control and steady-state synchronization control, etc., other burst-like data may be duplicated during a specific time period in which the burst-like data is already designated as the occupied time period. Specified control, etc., may result in a communication failure that may lead to line disconnection in the communication line. Conventionally,
In the line monitoring system that deals with such line failures, the line monitoring and control station does not have the function to independently detect functional failures related to the initial connection control and steady synchronization control, and each station is controlled by the line monitoring and control station. The control status of the communication line is constantly monitored by another third station belonging to the communication line, and when an abnormality is detected in the control status, information on the abnormality in the control status is immediately transmitted to the line monitoring and control station, and the line monitoring and control station At the station, emergency measures are taken, such as stopping the control function for each burst data corresponding to each station. Further, in another example of the conventional line monitoring system, as shown in FIG. In the line monitoring and control station composed of the above, a line monitoring system including a burst data sending state control circuit 18 and a burst data monitoring circuit 19 is formed inside the monitoring control unit 17, as shown in FIG. Then, received burst data 101 input from the received signal processing section 16 is input to the burst data monitoring circuit 19, and is compared with predetermined burst data reception plan information 102 also sent from the received signal processing section 16. The synchronization code point and SC (Service
Channel) information, etc. are checked, and a burst data transmission status signal 1 corresponding to the check result is sent.
04 is output, and a predetermined alarm signal 103 is output when a change in the burst sending state is detected. In the burst data transmission state control circuit 18, a burst data transmission state signal 104 is inputted, and when a state change occurs in the signal, a monitoring operator confirms whether the change in control state is correct via an alarm signal 103. At the time when the monitoring operator determines that there is an abnormality in the control state, the burst data is outputted for the first time via the burst data transmission state control circuit 18,
An emergency measure has been taken to manually stop the burst data transmission state control signal 105 sent to the transmission signal processing section 14.

However, in the above-mentioned conventional line monitoring system, in response to a line failure related to both the initial connection control and steady synchronous control functions of the line monitoring and control station in the communication line, the line monitoring and control station detects a control abnormality. This method has the disadvantage that it takes a long time to recognize the state, and as a result, the duration of line failure in the communication line increases, and the line efficiency is significantly reduced.

(Objective of the Invention) An object of the present invention is to eliminate the above-mentioned drawbacks, monitor and control the burst data transmission status for each station by referring to predetermined burst data reception plan information, and at least By inserting one or more test bursts and monitoring the control signals corresponding to the test bursts, it is possible to detect an abnormality in the line monitoring and control function in an extremely short period of time, and to prevent a line disconnection in the communication line. The object of the present invention is to provide a line monitoring method that works to prevent the above problems.

(Structure of the Invention) The line monitoring method of the present invention uses a plurality of burst-like data arranged in chronological order within a specific time frame, with an occupied time zone etc. specified in advance, to monitor a predetermined line. In a time division multiplex communication line formed by multiple stations including a supervisory control station and a plurality of slave stations, information contents such as the station number of each station including the slave stations and the occupied time period of burst data corresponding to each station are transmitted. include. Referring to the burst data reception plan information, check both the digital processing action on the received burst data and the control function for the burst data transmission state, which are inserted into the free time slot in the specific time frame. a test burst generating means for generating a test burst for a test; and a burst-like data multiplexing means for time-divisionally multiplexing the test burst with respect to received burst-like data sent from a predetermined receiving and demodulating system. , inputting either a burst data string output from the burst data multiplexing means or a line monitoring data string obtained through a predetermined data processing operation on the burst data string; , These inputs are compared with the burst data reception plan information and the test burst creation information input via the test burst generation means, and each station or each burst in the received burst data string including the test burst is burst data monitoring means for monitoring and determining the corresponding synchronization code position and predetermined information signal, and outputting it as a burst data transmission status signal for each station or for each burst; burst data transmission state control means that receives a burst data transmission state signal and generates and outputs a burst data transmission state control signal corresponding to the synchronization code position and a predetermined information signal; A transmission state control signal and test burst creation information sent via the test burst generation means are input, a predetermined control signal for the test burst is extracted from the burst data transmission state signal, and a predetermined control signal for the test burst is extracted from the burst data transmission state signal. Control signal monitoring means for determining whether or not the control signal is generated normally and outputting a predetermined alarm signal if the control signal is not generated normally.

(Embodiments of the Invention) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 4 is a block diagram showing essential parts of an embodiment of the present invention. In the figure, the line monitoring system of the present invention includes a burst data transmission state control circuit 20.
, a burst data monitoring circuit 21, a control signal monitoring circuit 22, a test burst generation position indicating circuit 23, a burst data reception plan information generation circuit 24, a test burst generation circuit 25, and a burst data multiplexing circuit 23. A circuit 26 is provided. In the present embodiment shown in FIG. 4, a burst data sending state control circuit 20, a burst data monitoring circuit 21, and a control signal monitoring circuit 22
are included in the monitoring control unit 17, and include a test burst generation position instruction circuit 23, a burst data reception plan information generation circuit 24, and a test burst generation circuit 25.
The burst data multiplexing circuit 26 is included in the received signal processing section 16.

In FIG. 4, burst data reception plan information 106, which includes information contents such as the station number of each station forming a TDMA satellite communication line and the occupied time period of burst data corresponding to each station, is burst data reception plan information. It is generated in the generation circuit 24 and input to the burst data monitoring circuit 21 and the test burst generation position indicating circuit 23. On the other hand, received burst data 109 sent from the receiving section 15 is input to the burst data multiplexing circuit 26 . The test burst generation position indicating circuit 23 and the test burst generation circuit 25 are as follows:
It forms a test burst generating means that generates a predetermined test burst 114, and in the test burst generation position indicating circuit 23, the burst data reception plan information 106 is decoded to determine the time period in which received burst data does not exist. The slot is searched and extracted, the insertion time position of the test burst with a predetermined station number, burst number, etc. added is set for this free time slot, and the test burst timing signal 113 is output. Test burst creation information 110 and 111 specifying the test burst insertion time period, station number, etc. are generated and sent to the control signal monitoring circuit 22 and the burst data monitoring circuit 21, respectively.

The test burst generation circuit 25 generates a test burst 114 corresponding to the time zone and station number indicated by the input test burst timing signal 113, and sends it to the burst data multiplexing circuit 26. In the burst data multiplexing circuit 26, for the received burst data 109 inputted from the above-mentioned receiving section 15,
The test bursts 114 are time-division multiplexed;
The data is output as predetermined burst data 115. This burst data 115 may be treated as a predetermined line monitoring data string through predetermined digital processing, if necessary. This burst data 115 (or line monitoring data) is transmitted to the burst data monitoring circuit 21
As described above, this burst data monitoring circuit 21 receives the burst data reception plan information 106 and test burst information 111. For example, TDMA (Time
Division Multiple Access) system, etc., the burst data reception plan information 106 and the test burst creation information 111 are referred to, and a unique Word detection, unique word type identification, unique word reception position error detection, SC (Service
(Channel) Message propriety check, burst reception state history check, SC message reception state check, transmission state propriety check, and other operations are executed. Through the various operations on the burst data 115 described above, the burst data monitoring circuit 21 outputs the burst data sending state signal 112 and inputs it to the burst data sending state control circuit 20. In the burst data transmission state control circuit 20, the burst data transmission state signal 112 is input, and a control signal for the burst data transmission state corresponding to the above-mentioned detection action and check action in the burst data monitoring circuit 21 is input. is generated and output as a burst data transmission state control signal 108. This burst data transmission state control signal 1
08 is sent to the transmission signal processing section 14 and also input to the control signal monitoring circuit 22. Test burst creation information 110 sent from the test burst generation position instruction circuit 23 is also input to the control signal monitoring circuit 22 at the same time, and by referring to this test burst creation information 110, Only the control signal for the test burst is extracted from the state data transmission state control signal 108, and the appropriateness of the message generated in response to the test burst is checked via this control signal. The presence or absence of a failure in the operating functions related to the above operations in the monitoring circuit 21 is quickly detected, and as a result, the TDMA satellite communication line is effectively protected.

In addition, what is shown in FIG. 5 a, b and c is
FIG. 5A is a diagram showing an example of the TDMA frame and burst configuration in the above TDMA system. FIG. of TDMA
This is an example of a frame. In the figure, RB
(Reference Burst) is a reference burst that is the timing reference for TDMA frames, TB1, TB2,
TB3, . . . , TB(N-1) and TBN are traffic bursts corresponding to time slots occupied by each of the slave stations. Furthermore, FIGS. 5b and 5c show the burst configurations of the reference burst RB and traffic burst TB1, respectively, and these bursts each have a C/BTR (Carrier and Bit Timing) in common.
Recovery), UW (Unique Word), TTY
(Teletype Order Wire), SC (Service
Channel) and VOW (Voice Order Wire) are arranged. In addition, as a part connected to the above common part, CONT/
DC (Control and DElay Channel) and TD
(Traffic Data) is located.

As described above, with reference to the burst data reception plan information 106, the test burst generated by the test burst generation means formed by the test burst generation position indicating circuit 23 and the test burst generation circuit 25 is, for example, The time period in which the traffic burst is absent in Fig. 5a,
Or, generally, the TD time period in the traffic burst shown in FIG. 5c is detected and selected and inserted. Also, in this case,
As mentioned above, the test burst 114 is composed of UW and SC as main parts, and the burst data transmission state control signal 108 is the SC message or CONT/DC in the reference burst RB.
It functions to control the transmission status of burst data of other stations.

In the above description, the present invention was explained by referring to a satellite communication line based on the TDMA method as a time division multiplex communication method to which the present invention is applied. Although not limited to this, in general, communication between a predetermined line monitoring control station and a predetermined line monitoring control station is performed using a plurality of burst-like data arranged in chronological order within a specific time frame, with the occupied time slot etc. specified in advance. Needless to say, the present invention can be effectively applied to a time division multiplex communication line formed by a plurality of stations including a plurality of slave stations.

(Effects of the Invention) As described in detail above, the present invention is applied to a time division multiplex communication line using burst data to quickly correct control function failures related to initial connection control, steady connection control, etc. in the communication line. This has the effect that the time division multiplex communication line can be effectively protected against line disconnection caused by the control function failure.

[Brief explanation of drawings]

Figure 1 is a conceptual diagram of an overall system of an example of a TDMA satellite communication line, Figure 2 is a conceptual block diagram of a line monitoring and control station, and Figure 3 is a block diagram showing the main parts of an example of a conventional line monitoring system. , FIG. 4 is a block diagram showing the main part of an embodiment of the present invention, FIG.
b and c are diagrams illustrating an example of a TDMA frame and burst configuration. In the figure, 1... Communication satellite, 2, 3, 12... Antenna, 4, 7... Line monitoring control station, 5, 6, 8, 9... Slave station, 10, 12
... Radiation beam, 13... Transmission section, 14... Transmission signal processing section, 15... Receiving section, 16... Reception signal processing section, 1
7... Monitoring control unit, 18, 20... Burst data sending state control circuit, 19, 21... Burst data monitoring circuit, 22... Control signal monitoring circuit, 23... Test burst generation position indicating circuit, 24... Burst data Reception plan information generation circuit, 25... test burst generation circuit, 26... burst-like data multiplexing circuit.

Claims (1)

[Claims] 1. Within a specific time frame, a predetermined line monitoring control station and a plurality of In a time division multiplex communication line formed by multiple stations including a slave station, receiving burst data including information contents such as the station number of each station including the slave station and the occupied time period of the burst data corresponding to each station. A test for checking both the digital processing effect on the received burst-like data and the control function on the burst-like data sending state, which are inserted into the free time slot in the specific time frame by referring to the plan information. test burst generating means for generating a burst; burst-like data multiplexing means for time-divisionally multiplexing the test burst with respect to received burst-like data sent from a predetermined reception demodulation system; Input either a burst data string output from the data multiplexing means or a line monitoring data string obtained through a predetermined data processing operation on this burst data string, and input these data strings. is compared with the burst data reception plan information and the test burst creation information inputted through the test burst generation means, and synchronization for each station or each burst in the received burst data string including the test burst is performed. burst data monitoring means for monitoring and determining a code position and a predetermined information signal and outputting it as a burst data transmission status signal corresponding to each station or each burst; and burst data transmission corresponding to each station or each burst including the test burst. burst data transmission state control means that receives a state signal and generates and outputs a burst data transmission state control signal corresponding to the synchronization code position and a predetermined information signal; and the burst data transmission state control signal. and inputting the test burst creation information sent through the test burst generation means, extracting a predetermined control signal for the test burst from the burst data transmission status signal, and confirming that the control signal is normal. 1. A line monitoring method comprising: control signal monitoring means for determining whether or not a signal is occurring, and outputting a predetermined alarm signal if the signal is not occurring normally.