JPH0728271B2 - Burst monitoring method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a time division multiplex communication device monitoring system, and more particularly to a burst timing pulse burst monitoring system indicating a time slot in which a wireless signal is to be output in a slave station. .

[Conventional technology]

As shown in FIG. 5, the conventional burst monitoring method is used for terminal devices 101-1 to 101-n and terminal devices 101-1 to 101-n which output input digital signal sequences 1-1 to 1-n. ~
Input digital signal sequence 1-1 given from n respectively
~ 1-n are converted to digital signal sequences 2-1 to 2-n on the radio side, and these digital signal sequences are output together with burst timing pulses 3-1 to 3-n indicating time slots to be output as radio signals. Output port circuit 102-1 to 10-1
02-n, digital signal sequences 2-1 to 2-n output from one or more port circuits and burst timing pulses 3-1 to 3-n are multiplexed and multiplexed. A common unit 103 that outputs the digital signal sequence 4 and the multiplexed burst timing pulse 5, and a disconnection detection circuit 107 that detects disconnection of the multiplexed burst timing pulse 5 and outputs the disconnection detection result 10. It consists of The disconnection detection operation will be described with reference to the time chart of FIG. One or a plurality of port circuits 102-1 to 102-to prevent the wireless signal of the own station from being accidentally transmitted in the time slot in which the wireless signal of another child station is to be output, or for monitoring the child station itself. burst timing pulses 3-1 to 3-n (a to n in FIG. 2) output from the common unit 10
The burst timing pulse 5 (k in FIG. 2) multiplexed by 3 is subjected to disconnection detection. That is, when the multiplexed burst timing pulse 5 is fixed to the "H" level or the "L" level, the disconnection detection circuit 107 outputs the disconnection detection result 10 and is detected as a failure.

[Problems to be solved by the invention]

However, in such a system, since the disconnection is detected for the multiplexed burst timing pulse 5, as shown in FIG. 3, for example, the output burst timing pulse of two port circuits (see FIG. When l and m) are overlapped partially or entirely in timing, the common part 10
The burst timing pulse 5 multiplexed from 3 is the third
Is output like p, and no abnormality is detected by the disconnection detection circuit 107. Similarly, as shown in FIG. 4, even if the burst timing pulse (d in FIG. 4) of the port circuit is mistakenly sent out as d ', the disconnection detection circuit 107 does not detect any abnormality. There was a flaw.

[Means for solving problems]

The burst monitoring system according to the present invention receives a digital signal train from a terminal device and converts it into a digital signal train on the radio side in a slave station device of a time division multiplex communication system composed of one master station and a plurality of slave stations. Then, one or a plurality of port circuits for outputting the signal train together with the burst timing pulse indicating the time slot to be output as a radio signal, and the digital signal train and the burst timing pulse output from the port circuit are multiplexed. Common unit to be converted, a setting circuit for setting the number of burst timing pulses to be output from the port circuit, and counting the number of multiplexed burst timing pulses output from the common unit for each radio frame period. A counting circuit, a set value of the setting circuit and a counting result of the counting circuit are compared every radio frame period. And having a comparator circuit for.

Example of Invention

Next, a burst monitoring method according to the present invention will be described with reference to the drawings with reference to embodiments.

FIG. 1 is a block diagram showing the configuration of an embodiment according to the present invention. In the figure, 101-1 to 101-n represent terminal devices, which output input digital signal sequences 1-1 to 1-n,
Denotes a port circuit, which converts the input digital signal sequence 1-1 to 1-n sent from the terminal devices 101-1 to 101-n into a digital signal sequence 2-1 to 2-n on the radio side. Burst timing pulses 3-1 to 3-n indicating a time slot in which the digital signal sequence of
Output with. Reference numeral 103 denotes a common part, which is a digital signal sequence 2-1 to 2-1 output from one or a plurality of port circuits 102-1 to 102-n and a burst timing pulse 3.
-1 to 3-n are respectively multiplexed, the multiplexed digital signal train 4 and the multiplexed burst timing pulse 5 are output, and the frame pulse 6 indicating the radio frame period is output. Reference numeral 104 denotes a setting circuit, which is a fixed allocation method (pre-Assinged or Fixed Assi
In the case of the Nged method), the port circuit 102 is initialized at the time of initial setting of the slave station, or when one or more ports are newly added, and in the case of the demand allocation method (Demand Assinged method) during operation. The number of burst timing pulses to be output from -1 to 102 to n is set, and the set value 7 is introduced on the output side. A counting circuit 105 counts the number of pulses in the burst timing pulse 5 multiplexed for each cycle of the frame pulse 6, and outputs a counting result 8.
Reference numeral 106 denotes a comparison circuit, which compares the set value 7 output from the setting circuit 104 with the counting result 8 obtained from the counting circuit 105 and outputs the comparison result 9 every 6 cycles of the frame pulse.

The operation of the embodiment of FIG. 1 will be described below with reference to the time charts of FIGS. First, the terminal device
Input digital signal 1 output from 101-1 to 101-n
-1 to 1-n are port circuits 102-1 to 102-n in the slave station
Are converted into digital signal sequences 2-1 to 2-n on the radio side. The digital signals 2-1 to 2-n output from the port circuits 102-1 to 102-n are multiplexed by the common unit 103 to form the digital signal train 4. On the other hand, in each of the port circuits 102-1 to 102-n, the time slot in which the signal sequence is to be output as a radio signal is fixed
-Assinged or Fixed Assinged method), it is determined at the time of initial setting of the slave station or when one or more ports are newly added, and the demand allocation method (Demand Assined method).
In the case of the ged method), the burst timing pulses 3-1 to 3-3 are determined in correspondence with each other during operation.
-N (a to n in FIG. 2) is output. At this time, the burst timing pulse 3 to be output from each port circuit
The numbers -1 to 3-n are set in the setting circuit 104.

The burst timing pulses 3-1 to 3-n output from the respective port circuits 102-1 to 102-n are multiplexed by the common unit 103 and output as the burst timing pulse 5 (p in FIG. 2). It The counting circuit 105 counts the number of pulses in the burst timing pulse 5 multiplexed for each cycle of the frame pulse 6, and outputs the counting result 8 to the comparison circuit 106. The comparison circuit 106 is the counting result 8 and the setting circuit.
The setting value 7 of 104 is compared with each cycle of the frame pulse 6, and the comparison result 9 is output. That is, when the multiplexed burst timing pulse 5 is fixed to the “H” level or the “L” level, no pulse is counted, so the counting result 8 and the set value 7 are different, and the comparison circuit 106 Can output the comparison result and detect the failure.

Further, as shown in FIG. 3, for example, output burst timing pulses of two port circuits (two pulses are counted when l and m in FIG. 3 partially or entirely overlap in timing). However, since the multiplexed burst timing pulse 5 is output as one pulse as indicated by p in Fig. 3, it is possible to detect a fault in the comparison circuit 106. Further, as shown in Fig. 4. Even when the burst timing pulse that should be d is output as d ', a failure can be detected in the same manner.

〔The invention's effect〕

As is clear from the above description, according to the present invention, by counting the number of burst timing pulses after multiplexing, it is possible to perform burst monitoring more easily and reliably, and thereby a time division multiplexing system. The effect obtained to improve the reliability of is great.

[Brief description of drawings]

FIG. 1 is a block diagram showing the construction of an embodiment of a burst monitoring system according to the present invention, FIGS. 2 to 4 are time charts for explaining the operation of the burst monitoring system, and FIG. 5 is a conventional burst system. It is a block diagram which shows the structural example of a monitoring system. In the figure, 101-1 to 101-n are terminal devices, and 102-1 to 102-
-N is a port circuit, 103 is a common part, 104 is a setting circuit, 105 is a counting circuit, 106 is a comparison circuit, and 107 is a disconnection detection circuit.

Claims (1)

[Claims] 1. A slave station device of a time division multiplex communication system comprising one master station and a plurality of slave stations, receives a digital signal sequence from a terminal device, converts the digital signal sequence into a digital signal sequence on a radio side, and One or a plurality of port circuits for outputting a signal train together with a burst timing pulse indicating a time slot to be output as a radio signal, and a common for multiplexing a digital signal train and a burst timing pulse output from the port circuit, respectively. Unit, a setting circuit for setting the number of burst timing pulses to be output from the port circuit, and a counting circuit for counting the number of multiplexed burst timing pulses output from the common unit for each radio frame period. A comparison circuit for comparing the set value of the setting circuit and the counting result of the counting circuit for each radio frame period. Burst regime, characterized by.