JPS60182237A - Communication channel setting system in time division pcm multi-direction multiplex communication system - Google Patents

Abstract

PURPOSE:To improve the talking utilizing rate by providing a means supervising an idle channel of each slave station and a means generating a channel number variable command to a master station to receive a communication channel from an adjacent slave station if connection requests are concentrated on a specific slave station. CONSTITUTION:A master station of a time division PCM multiplex communication system consists of a PCM terminal station device 1, a transmission section 2, a reception section 3 and a control section 4. The control section 4 is provided with a supervisory station 41 supervising a fault of each slave station, an ordering circuit 40, a clock converting circuit 42 and an idle channel designation circuit 43. If a connection in excess of the assigned channel number exists to the specific slave station in the circuit 43, an idle channel supervisory circuit of the terminal station device 1 detects an idle channel of an adjacent slave station. If an idle channel exists, an idle channel designation signal is outputted to the ordering circuit 40, the communication channel is received from the adjacent slave station to improve the talking end rate.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a communication channel setting method for a time division PCM multidirectional multiplex communication system.

[Technical background of the invention and its problems]

In general, a time-division PCM multidirectional multiplex communication system consists of one master station B and multiple slave stations (eight stations in the figure) D, as shown in Figure 1.
1 to D8, a maximum of 48 communication channels are divided and allocated to each slave station D1 to D8, and by using these communication channels, the master station B and each slave station D
1 to D8.

However, in such a system, each slave station D1~
The conventional communication channel setting for D8 is, for example, the second
As shown in the figure, 48 channels were fixedly assigned to slave stations D1 to D8, each with 6 channels. In order to increase the call completion rate, if a communication request exceeding the limit occurs, even if there is an empty channel at another slave station, it cannot be used flexibly and the communication must be abandoned. I couldn't do it.

[Purpose of the invention]

The present invention provides communication in a time-division PCM multi-directional multiplex communication system that allows communication channels to be accommodated from adjacent slave stations when connection requests are concentrated on a particular slave station, thereby improving the call utilization rate. The purpose is to provide a channel setting method.

[Summary of the invention]

In order to achieve the above object, the present invention provides a master station with means for monitoring the empty channels of each slave station and a means for generating a channel number variable command, and provides the master station with means for monitoring the empty channels of the slave stations adjacent to the hand monitoring means. If a channel is detected and there is an empty channel, a channel number variable command is issued to each corresponding slave station, and the slave station is provided with a time slot variable means and its variable control means, and the channel number variable command is issued from the master station. When the time slot arrives, the variable control means issues a variable instruction to the time slot variable means, thereby varying the burst transmission gate length of the radio section and varying the number of communication channels.

[Embodiments of the invention]

FIGS. 3 to 5 are circuit block diagrams showing the configurations of a master station, its PCM terminal device, and a slave station to which a communication channel setting method according to an embodiment of the present invention is applied, respectively.

First, the master station is composed of a PCM terminal device 1, a transmitter 2, a receiver 3, and a controller 4.

The transmitter 2 converts the multiple output signals from the PCM terminal device 1 into a balanced/unbalanced conversion circuit (B/U). After passing through 0, the speed is converted by the speed conversion circuit (5PDCONV) 21,
Thereafter, a multiplexing circuit (MTJX) 22 multiplexes a synchronization signal, a line monitoring signal, etc. onto this main signal. This multiplexed signal is then sent to a scrambling circuit (SCR) 23
and a transmission circuit (Txl) via the hybrid circuit 24.
) 25, and this transmitting circuit (TXI), ? 5, and then sent out from an antenna 28 via a switching circuit 26 and a filter/IP filter (BPF) 27, respectively. The switching circuit 26 is configured to switch between the active transmitting circuit (TXI) 25 and the backup transmitting circuit (TX2).
This is to select the following.

The receiving section 3 guides the signal received by the antenna 28 to a receiving circuit 32 via a bandpass filter (BPF) 30 and a hybrid circuit 31, and demodulates the signal in this circuit 32. This demodulated signal is then led to a descrambling circuit (DSCR) 35 via a switching circuit 34 that switches between the working receiving circuit 32 and the backup receiving circuit 33, and after passing through this circuit 35, it is sent to a separating circuit (DMUX) 36. The main signal is separated from the synchronization signal, line control signal, etc. at , and a free channel designation circuit (CCO) 43. The meeting circuit 40 is for holding meetings with each slave station. Furthermore, the monitoring circuit 41 is used to inquire of each slave station when an abnormality occurs. Now, when a connection request exceeding the number of assigned channels is generated for a specific slave station, the empty channel designation circuit 43 instructs an empty channel monitoring circuit (to be described later) to detect an empty channel of an adjacent slave station. Let me do it.

If there is an empty channel, an empty channel designation signal is output to the meeting circuit 40.

Next, the PCM terminal device 1 transmits communication channels CH7 to CH2.
Channel conversion circuits 101 to 124 provided every 4 channels,
It is composed of a multiplexing section 10. Each of the channel conversion circuits 101 to 124 is an analog-to-digital conversion circuit (A/D) JJ that digitizes a transmission signal such as an audio signal.
and a digital-to-analog conversion circuit (D/A) 12 that converts the received signal into an analog signal.

On the other hand, the multiplexer 10 includes a main signal transmitter 13 and a main signal receiver 14. The main signal transmitter 13 includes a transmission clock generation circuit 131 and a channel pulse generation circuit 132.
, a not-turn generation circuit 133 , a frame pulse generation circuit 134 , and an unbalanced balance conversion circuit 135 , and a frame pulse and channel balance conversion circuit 141 are applied to the digitized transmission signals from each of the channel conversion circuits 101 to 124 . , a terminal relay circuit 142, and a 7-rem synchronization circuit (
FLAMSYNC) 143, a frame pulse detection circuit (FLAMPULSE) 144, a channel pulse detection circuit 145, and an alarm generation circuit 146.

Incidentally, such a multiplexing section 10 is provided with an empty channel monitoring circuit 15. This empty channel monitoring circuit 15
1 inputs the digitized transmission signals from each of the channel conversion circuits 101 to 124 and the digitized reception signal output from the terminal relay circuit 142, and detects an empty channel from these signals. Detection of this empty channel is performed, for example, as follows. That is, in general, in a time-division PCM multidirectional multiplex communication system, a signaling bit is inserted into the final bit (8th bit) constituting each channel six times in six frames (one frame = 24 channels) to perform bit staying. I am doing it.

The above signaling bit is 1” if the channel is empty.
If p1 is not empty, it will be 0''. Therefore, monitor this signaling bit and, for example,
1'', the channel is recognized as empty, and empty channel detection can be performed.

In the above explanation, for convenience of explanation, the master station was explained as a system with 24 channels per frame (PCM-24 system), but when operating with 48 channels as in this embodiment, the PCM-24 system described above is used. Two systems are required.

On the other hand, the slave station shown in FIG. 5 is composed of a PCM terminal device 1a, a transmitter 2a, a receiver 3a, and a controller 4a.
Its circuit configuration is the same as that of the master station (FIG. 3) except for a part. Note that in FIG. 5, the same parts as in FIG. 3 are given the same reference numerals and detailed explanations will be omitted.

That is, the receiving section 3a is newly provided with a delay circuit 39 and a conversion synchronization circuit 49, and the received signal from the switching circuit 34 is delayed for a predetermined time by the delay circuit 39 to be output to the descrambling circuit 35 and the conversion synchronization circuit. It has been introduced in 49. This conversion synchronization circuit 49 includes the descrambling circuit 3
It generates the signals necessary for the operation of 5.

The control unit 4a also includes a burst generation circuit (BUR8T).
GEN ) 4s and a time slot variable circuit (C
CK) 46 are provided.

The burst generating circuit 45 generates a burst signal at the time position so that the slave station can perform transmission and reception operations only at the time position of the channel assigned to itself. Now, the time slot variable circuit 46 operates when an empty channel designation signal arrives at the meeting circuit 40a from the meeting circuit 40 of the master station, and is operated when this signal is supplied. A burst length control signal is generated, and the burst gate length of the burst generation circuit 45 is varied by this signal.

The PCM terminal device 1a of the slave station has the same configuration as the PCM terminal device 1 of the master station, except that the empty channel monitoring circuit 15 is not provided.

Next, the communication channel setting method of this embodiment in the system configured as described above will be explained. First, during normal operation, as in the conventional case (Fig. 2), slave station D
1 to 6 channels are sequentially allocated to slave stations D8.

Therefore, at this time, the burst generation circuit 45 of each slave station D1 to D8 generates a burst signal with a time width of 6 channels at the time position of the channel assigned to itself, and each slave station D1 to D8 generates a burst signal with a time width of 6 channels. D8 performs transmitting and receiving operations at the generation time position of the burst signal.

For example, assume that slave station D2 is using all six channels assigned to it.

At this time, as a matter of course, in the master station B, CH7 to CH12 corresponding to all channels of the slave station D2 are blocked.

Now, in this state, a connection request (call) is made to master station B with slave station D2.
occurs, the master station B receives P from the channel designation circuit 43.
A signal is issued to the empty channel monitoring circuit 15 of the CM terminal device 1 to cause it to detect empty channels of the slave stations DI and D3 adjacent to the slave station D2. The empty channel monitoring circuit 15 is
It operates when the above detection instruction signal arrives, and the slave station DI
, D3, channels CH5, CH6 and CHI 3 adjacent to the slave station D2.

14 vacant spaces are detected. As mentioned above, this empty space detection monitors the signaling bit inserted at the 87th (/,',) of each channel every 6 frames, and if this bit is at the "1" level for one second, for example, This is done by determining that it is empty.

Now, as a result of the above empty detection, for example, channel CHI 3
, CHI 4 is empty, this fact is transmitted to the empty channel designation circuit 43, and the empty channel designation circuit 43 generates a signal to designate the channels CH13 and CH14f as empty. The designated signal is supplied to the meeting circuit 4θ. Then, the meeting circuit 40 configures the line used for the meeting into a demultiplexing configuration using, for example, a low-pass filter and a high-pass filter, and adds 3 KHz to the upper (2.4 to 3.4) G(z) band.
By inserting a single tone signal of D2 and encoding this single tone signal, the empty channel designation signal is transmitted to the corresponding slave station D2. The signals are sent to the meeting circuit 40a of D3. When the empty channel designation signal is introduced into the time slot variable circuit 46 via the negotiation circuit 40h, the time slot variable circuit 46 controls the burst length to add the empty channel designated by the empty channel designation signal to its own channels. A signal is generated and this signal is supplied to the burst generation circuit 45.

As a result, the burst dart length of the burst generating circuit 45 is varied in accordance with the burst length control signal, thereby changing the length of the burst signal.

Therefore, the number of channels that can be transmitted and received by slave station D2 is increased to a total of 8 channels from channels CH7 to CH14, as shown in FIG. It also becomes possible to form a communication line for new calls. Note that the number of communicable channels of the slave station D3 decreases by two channels to a total of four channels, CH25 to CHIg.

The state in which the channels are changed is canceled when the communication using channels CH7 and CH8 of the slave station D2 is completed,
The initial state shown in FIG. 2 is restored. The command in this case is also issued using the meeting line between the master station B and the slave station D2.

In this way, with the method of this embodiment, even if a call occurs to a given slave station when all of its channels are occupied, it is possible to accommodate the empty channels of adjacent slave stations. , without giving up the connection to the above call.
Normally, under-circuits can be formed. That is, the call completion rate can be improved.

Note that the present invention is not limited to the above embodiments.

For example, in the above embodiment, when varying the number of channels,
Although one channel of an adjacent slave station is accommodated, if both slave stations have empty channels, all of them may be accommodated. In FIG. 6, @ indicates an example of the state. In addition, when accommodating channels to slave stations DI and DB, it is sufficient to do so as shown by broken lines θ and @ in FIG. The number of flexible channels may be one channel or three or more channels in addition to two channels. In addition, the configurations of the master station, slave stations, and PCM terminal equipment can be modified and implemented in various ways without departing from the gist of the present invention.

〔Effect of the invention〕

As described in detail above, according to the present invention, when a call that exceeds the number of channels allocated to a specific slave station occurs, the empty channels of the slave stations adjacent to the slave station are detected. If so, it is possible to provide a call channel setting method for a time-division PCM multidirectional multiplex communication system that can greatly improve the call completion rate by allowing this channel to be used by the specific slave station.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing the general configuration of a general time-division PCM multidirectional multiplex communication system, Fig. 2 is a schematic diagram for explaining a conventional communication channel setting method, and Figs. 3 to 6 are used in this book. This is a diagram for explaining a communication channel setting method in an embodiment of the invention, and FIGS. 3 to 5 are circuit block diagrams showing the configurations of a master station, its PCM terminal device, and a slave station to which the same method is applied, respectively. , FIG. 6 is a schematic diagram for explaining variable channel control. B...Master station, D1-D8...Slave station, 1. la...
PCM terminal device, 2.2a... transmitter, 3,3a...
- Receiving section, 4, 4a... Control section, 11... Analog-to-digital conversion circuit, 12... Digital-to-analog conversion circuit, 13... Main signal transmitting section, 14... Main signal receiving section, 15 ...Empty channel monitoring circuit, 101-124...
- Channel conversion circuit, 131... Transmission clock generation circuit, 132... Channel pulse generation circuit, 133...
- Pattern generation circuit, 134... Frame pulse generation circuit, 135... Unbalanced balance conversion circuit, 141...
Balanced unbalanced conversion circuit, 142...terminal relay circuit) 14
3.° Frame synchronization circuit, 144... Frame pulse generation circuit, 145... Channel pulse detection circuit, 1
46... Alarm generation circuit, 20... Balanced unbalanced conversion circuit, 21... Speed conversion circuit, 22... Multiplexing circuit, 23... Scramble circuit, 24.31... Hybrid circuit, 25.29... Transmission circuit, 26.3
4... Switching circuit, 27, 30°°° pantone filter, 28... Antenna, 32. 33... Receiving circuit, 35... Descrambling circuit, 36... Separating circuit, 37 ...speed conversion circuit, 38...unbalanced balance conversion circuit, 39...delay circuit, 40.40th...meeting circuit, 4th...monitoring station, 41a...° monitored station,
42... Clock conversion circuit, 43... Empty channel designation circuit, 45... Burst generation circuit, 46... Time slot variable circuit. Applicant's agent Patent attorney Takehiko Suzue 17-

Claims (1)

[Claims] A system consisting of one master station and a plurality of slave stations, in which a predetermined number of communication channels are allocated to each slave station, and time-sharing P is used between the master station and each slave station.
In a system that performs CM multidirectional multiplex communication, the master station has an empty channel monitoring means for monitoring empty channels for each slave station, and a communication request that exceeds the number of communication channels allocated to any slave station. means for causing the empty channel monitoring and monitoring means to detect the empty channels of each adjacent slave station and, if there is an empty channel, to issue a channel number change command to the corresponding slave station; a time slot variable means for varying the length of the burst transmission f-t of the communication unit; and means for varying the number of communication channels by issuing a variable instruction to the time slot variable means when the channel number variable instruction arrives from a master station. A communication channel setting method for a time-division PCM multidirectional multiplex communication system having the following feature 1-.