JPS61255138A - Multi-directional multiplex communication system - Google Patents

Abstract

PURPOSE:To match the initial phase matching to a slave station taking part newly independently whether or not a phase control of a sending timing signal is executed to other slave stations in operation by providing a storage means storing the operating state of each slave station in an always revising way to a master station side. CONSTITUTION:The operating state of each of plural slave stations is stored in a storage circuit 7 in an always revised form and a specific time slot in a TDMA frame sent from the master station side to the slave station side via a multiplexer 2 is designated by a control signal 115. When a slave station participated newly exists, a maintenance polling signal 109 to request the sending the initial phase matching burst signal is outputted. A multiplex separator 13 extracts separately the said maintenance polling signal 119 inserted in the time slot of a specific channel, the initial phase matching burst signal 125 is multiplexed onto a frame constitution signal 117 in the multiplexer 18 and outputted as a multiplex signal 127.

Description

[Detailed description of the invention] [Application fields in the nitrogen industry] The present invention relates to a multidirectional multiplex communication system, and relates to a 4IK.

The present invention relates to a multidirectional multiplex communication system that enables initial phase matching for a newly joined slave station in a multidirectional multiplex communication system formed by a demand assignment system.

[Conventional technology]

In the multi-directional multiplex communication system formed by the demand assignment system, there is a communication system between one master station and multiple slave stations that are geographically dispersed, which is called the time-efficient use of frequencies in the communication line. It's a point of view.

A predetermined time division multiplex communication line is formed in such a way that transmission is stopped at times other than when information transmission is required on the slave station side, and the usage time of other slave stations is increased. .

In the conventional multi-directional multiplex communication system using this demand assignment method, in response to a request for transmission of an information signal at the slave station that has stopped transmission, the phase of the transmission tie setting signal at the slave station is of,! In order to adjust the control to match the time standard of the li station, a preamble word for extracting the transmission timing signal of the slave station in one master station IIK is added to the head of the burst signal sent from the slave station to the master station. As an improvement to the adding method, the following multi-directional multiplex communication system is used.

The master station multiplexes a maintenance polling signal with the main signal and sends out a maintenance polling signal requesting transmission of a predetermined maintenance burst signal to the slave stations that have not received an information signal transmission request. In response to the maintenance polling signal, the maintenance burst signal is sent back to the master station via a predetermined transmission timing signal. On the master station side, extracting the transmission tying signal in the slave station from the maintenance burst signal,
The time difference with the reference timing signal within the master station is detected, and this time difference is multiplexed into the main signal and sent to the slave station. On the slave station side, this time difference is extracted and the phase of the transmission timing signal within the slave station is controlled and adjusted via this time difference. In this case, the maintenance polling signal and the maintenance burst signal are set at a predetermined TDlvl (Tiy Div
The transmission request is inserted into the time slot corresponding to the maintenance channel in the multiple access) frame, multiplexed, and transmitted between the master station and the slave station. Even for a slave station that does not have a mobile station, the time slot Kl corresponding to the predetermined maintenance channel in the TDMA frame mentioned above, despite the demand assignment method, the phase of the transmission timing 4y is different from that of the master station side. Control adjustment is made to match the phase of the reference signal.

Problems to be solved by invention C] As mentioned above, in the conventional multidirectional multiplex communication system,
In response to multiple operating slave stations, for a slave station that does not request the transmission of an information signal, the power supply can control and adjust the phase of the transmission timing signal of the slave station through the time slot of a predetermined maintenance channel. This is possible, but when a new slave station joins the multiple operating slave stations, the master station side is always Since the phase of the transmission timing signal of the existing operating slave station is controlled and adjusted in the master station, it is impossible for the master station to control the phase of the transmission timing signal for the newly joined slave station. There is a problem in that it is not possible to perform initial phase matching for a newly joined subscriber station.

[Means for solving problems]

In order to solve the above problems, the multidirectional multiplex communication system of the present invention includes a predetermined master station and a plurality of slave stations subordinate to the master station, and uses a predetermined demand assignment method. As reference information for sending a maintenance polling signal requesting the sending of a predetermined initial phase matching burst signal from the master station side to a newly joined slave station, A predetermined signal in the slave station 11 is stored through a storage means that constantly stores the operational status of a plurality of slave stations, and a preamble word included in the initial phase matching burst signal sent back from the newly joined slave station. By extracting the transmission timing signal of the master station and comparing it with the reference timing signal in the master station, the mutual clock and bit time differences are detected, and this time difference is multiplexed into a predetermined main signal to transmit the newly joined slave station. a preamble word for extracting a predetermined transmission timing signal for the maintenance polling signal sent from the master station in response to a new join; a means for generating the burst signal for initial phase matching including and sending it back to the master station side, and extracting the time difference multiplexed with the main signal and sent from the master station side, and referring to the clock and bit time difference. and means for controlling and adjusting the phase of the transmission timing signal on the slave station side.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing the main parts of a master station and a slave station in an embodiment of the present invention.

As shown in No. 111, the main station side in this embodiment includes a transmission signal processor 1, a multiplexer 2, a modulator 3, a reference timing signal generator 4, and a time difference detector 5.
, a maintenance controller 6 , a memory circuit 7 , a transmission/reception system 8 ,
A demodulator 9 and a received signal processor 10 are provided, and the slave station side includes a transmitting/receiving system 11, a demodulator 12, a demultiplexer 13, a received signal processor 14, and a 7-frame information regenerator. 15, maintenance controller 16, transmission signal processor 17, multiplexer 18, timing controller 19, and modulator 2
0 is provided.

The main difference between the embodiment shown in FIG. 1 and an example of a conventional multidirectional multiplex communication system is that in order to accommodate newly joined slave stations, the master station side: A memory circuit 7 that constantly stores the operating status of each slave station is added, and new operational functions are added to the time difference detector 6 and maintenance controller 5. , new operational functions have been added to the maintenance controller 16.

In FIG. 1, during normal operation, an information signal 101 input from a predetermined terminal is transmitted to a transmission signal processor I.
The reference timing signal 103 sent from the reference timing signal generator 4 undergoes signal processing and is sent to the multiplexer 2 as a main signal 102 formed by a digital multiplex signal.

In the multiplexer 2, a maintenance polling signal 109 or a time difference detection signal 110, which is also input to the maintenance controller 6 depending on the operation, is inserted into a predetermined time slot of the main signal 102 and multiplexed. , the modulator 3 and the transmitting/receiving system 8 to each slave station. Front: Transmission/reception system 8
The main signal 111 sent from each slave station via the demodulator 9 is processed in the received signal processing circuit 10 by the reference timing signal 104 sent from the reference timing signal generator 4. The received signal is processed and sent to a predetermined terminal as an information signal 112.

In this case, the demodulator 9 outputs the reproduced clock signal 106 from a slave station with no transmission request or the preamble word 107 from a newly joined slave station, depending on the operation.
It is input to the time difference detector 5.

When a newly joined slave station is not present, the maintenance boring signal 109, which is also output from the maintenance controller 6 in response to a slave station that does not request transmission, is sent to the multiplexer 2 as a predetermined maintenance signal. In response to this maintenance polling signal 109, the maintenance burst signal returned from the slave station is detected by the demodulator 9. The reproduced clock signal 106 is input to the time difference detector 5, and the time difference detector 5
The bit time difference between the reference timing signal 105 and the reference timing signal 105 is detected. This time difference is determined by the time difference detection signal 108
is output as a time difference signal 1 via the maintenance controller 6.
10 is input to the multiplexer 2, multiplexed into the main signal 102, and sent to the slave station side. The slave station side detects the time difference using this time difference detection signal, and controls and adjusts the phase of the transmitted tie ζ blowfish signal on the slave station side with reference to this time difference. The outline of the phase control of the transmission tie ζ puffer signal for a slave station that does not have a transmission request has already been outlined in the description of the conventional example.

If there is a newly joined slave station, the maintenance controller 6 sends an initial phase matching burst signal to the newly joined slave station via the control signal 115 sent from the storage circuit 7. Maintenance polling signal 109 for requesting transmission
is output and input to the multiplexer 2. The storage circuit 7 stores the operational status of each of the plurality of slave stations in a constantly updated manner, and stores the operational status of each of the plurality of slave stations in a constantly updated manner. The time slots are designated by control signal 115.

This maintenance polling signal 109 is inserted into the above-mentioned specific time slot in the multiplexer 2, and the main signal 102
The signals are multiplexed into multiplexed signals and sent to the slave station via the modulator 3 and the transmitting/receiving system 8.

The block diagram of the slave station shown in FIG. 1 shows the main parts of the slave station that can be handled when a new member joins. The main signal 116 is received and demodulated via the demultiplexer 13 and the frame information regenerator 15. A frame synchronization signal 117 is regenerated and extracted from the frame information regenerator 15 and sent to the demultiplexer 13% reception signal processor 4 and the transmission signal processor 17. In the demultiplexer 13, the main signal 116 and the maintenance polling signal 119 inserted into the time slot of the specific channel are separated and extracted and sent to the maintenance controller 1.6. In the maintenance controller 16 , an initial phase matching burst signal 125 including a predetermined preamble word is generated via the maintenance polling signal 119 and sent to the multiplexer 18 .

The multiplexer 18 receives the frame configuration signal 12 output from the transmission signal processor 17 via the frame synchronization signal 117.
In the multiplexer 18, the burst signal 125 for initial phase matching is multiplexed with the frame configuration signal 117, and is output as a multiplexed signal 127. The multiplexed signal 127 containing the burst signal for initial phase matching is sent to the modulator 20 via the timing controller 19.

A burst control signal 129 is sent to the modulator 20 from the transmission signal processor 17.
The carrier wave signal is controlled to be turned on and off at a predetermined timing, and a burst signal is generated and sent to the master station via the transmitting/receiving system 11.

On the master station side, a burst signal including the above-mentioned burst signal for initial phase matching is input to a demodulator 9 via the transmitting/receiving system 8 and demodulated, and a main signal 111 is output and sent to the received signal processor 10. At the same time, an initial phase matching burst signal 107 including a preamble word is outputted and inputted to the time difference detector 5. In the zero time difference detector 5, a burst signal 107 for initial phase matching including a preamble word is outputted and inputted to the time difference detector 5. The preamble word is detected from the burst signal 107 for initial phase matching via the control signal 114 that comes, and the time difference between it and the reference timing signal sent from the reference timing signal generator 4 is extracted. This time difference is output as a time difference signal 108, and the maintenance controller 6
The signal is input to the multiplexer 2 as a time difference signal 110 via . In the multiplexer 2, the 1-time difference signal 110 is sent to a specific time slot (K) in the TDM human frame via the control signal 115, as in the case of the maintenance polling signal requesting the transmission of the burst signal for initial phase matching described above.
The modulator 3f is multiplexed with the main signal 102 in an inserted manner.
? and is sent to the slave station flK via the transmission/reception system 8. The main signal 111 output from the demodulator 9 is input to the reception signal processor 10, where it is received and processed via the reference timing signal 104 sent from the reference timing signal generator 4, and the information from each slave station is processed. It goes without saying that the signal 112 is sent to a predetermined terminal.

On the side of a newly joined slave station, in the same way as when receiving the maintenance polling signal requesting the transmission of the burst signal for initial phase matching described above, the demultiplexer 13 receives the above-mentioned specified times 4)K insertion signal. A time difference signal 12G is extracted separately from the main signal 116 and input to the maintenance controller 16. In the maintenance controller 16, the time difference signal 12
a predetermined timing control signal 126 corresponding to a time difference of 0;
is generated and input to the timing controller 19.

The timing controller 19 is also used to control the phase of the transmission timing signal for slave stations that do not request transmission, and is controlled by the timing control signal 126 and detected by the time difference detector 5 on the master station side described above. The delay time is controlled and set so that the time difference corresponds to zero. The delay time set value in the timing controller 19 is held at the set value until t until the set value is updated via the next polling signal for maintenance 9.

Therefore, for the initial phase matching in a newly joined slave station, as mentioned above, one master station is equipped with a memory circuit 7 that stores the operational status of each slave station in a constantly updated manner, and refers to the operational status. This is done by sending a maintenance polling signal from the parent station to the newly joined slave station via the control signal 115 output from the storage circuit 7.

This can be performed in a manner similar to the transmission timing phase control for a slave station that does not request transmission.

Note that when the initial phase of the newly joined slave station is set and the operation state is entered according to a predetermined procedure, the operation information 113 inputted from the time difference detector 5 to the storage circuit 7 indicates the operation state regarding the newly joined slave station. It is stored in the storage circuit 7 as information indicating. When a newly joined slave station enters the operational state, information signals 122 and 121 are input/output via the transmitting signal processor 17 and receiving signal processor 14, respectively, and are connected to the master station by a demand assignment method. A time division multiplex communication line is set up.

〔Effect of the invention〕

As explained in detail above, the present invention provides a storage means for storing the operational state of each slave station in a constantly updated form on the master station side, and controls output from the storage means with reference to this operational state. How to control the phase of the transmission timing signal to other operating slave stations by sending a maintenance polling signal that requests the newly joined slave station to send an initial phase matching burst signal via a signal. Regardless of the case, the advantage is that initial phase matching can be performed for the newly joined slave station.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the main parts of a master station and one slave station in an embodiment of the present invention. In the figure, 1.17...transmission signal processor, 2
゜18...Multiplexer, 3.20...Modulator, 4...Reference timing signal generator, 5.
...Time difference detector, 6.16...Maintenance controller, 7...Memory circuit, 8゜11...
・Transmission/reception system, 9.12... Demodulator, 13...
...Mux demultiplexer % 10.14 ... Reception signal processor, 15 ... Frame information regenerator, 19
...timing controller.

Claims (1)

[Claims] In a multi-directional multiplex communication system that includes a predetermined master station and a plurality of slave stations subordinate to the master station and is formed by a predetermined demand assignment method, a newly joined slave station On the other hand, a storage means for constantly storing the operational status of a plurality of operational slave stations as reference information for transmitting a maintenance polling signal requesting transmission of a predetermined initial phase matching burst signal from the master station side; Through a preamble word included in the initial phase matching burst signal sent back from the newly joined slave station,
A predetermined transmission timing signal on the slave station side is extracted and compared with the reference timing signal in the master station to detect at least the clock signal and bit time difference between them. means for multiplexing the signal into a predetermined main signal and transmitting it to the newly joined slave station; means for generating the initial phase matching burst signal including a preamble word for extracting a predetermined transmission timing signal and sending it back to the master station; A multi-directional multiplex communication system, characterized in that the slave station is provided with means for extracting at least the clock signal and the bit time difference, and controlling and adjusting the phase of the transmission timing signal by referring to the bit time difference. .