JPH06269071A - Subscriber line concentration exchange - Google Patents

Abstract

PURPOSE:To effectively utilize a subscriber channel by providing a subscriber highway and a line concentration switch in which a subscriber operating channel for each call is allocated corresponding to a state of a call to an optional time slot on the subscriber highway. CONSTITUTION:A control section 14 recognizes a subscriber number of a calling subscriber and a channel number having a subscriber connection request through the call from a subscriber circuit 11 (since a subscriber has one or plural channels, it is required to recognize a subscriber number and a connection request channel number simultaneously at calling). Then a time slot TS on a subscriber channel highway 12 allocated to the subscriber is designated by the circuit 11. Then the circuit 11 sends voice/data to the designated TS. Since the TS on the subscriber speech highway is allocated to a calling channel in this way, the subscriber speech highway accommodates subscribers without provision of all channel numbers of the subscribers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching device for concentrating subscriber lines, in which the number of voice / data channels used by the subscriber is
The present invention relates to an accommodation method and a control method for accommodating various subscriber circuits that differ for each subscriber and subscriber circuits in which the number of channels used by some subscribers changes with time.

[0002]

2. Description of the Related Art As a conventional method of a subscriber line concentrating switching device that accommodates various subscriber circuits in which the number of voice / data channels used by a subscriber is different for each subscriber, "-Special Feature-Evolution" Personal Communication "(Nikkei Communication 199
1.2.18, p.52-72), for a mobile phone system. Therefore, regarding the subscriber accommodation method when the mobile service is accommodated in the basic digital line and the number of accommodated mobile subscribers changes depending on the traffic volume, the speed conversion is performed outside the subscriber circuit. The structure of the line-corresponding speed conversion function unit is (FIGS. 2A to 2C). Can be thought of as. This conventional technique will be described below.

The configuration shown in FIG. 2 (a) is 64 kb / s.
Install a speed conversion circuit for the line in front of the digital switch, and with this circuit, a sub-rate data of 64 kb / s or less
In this configuration, the data (for example, 32 kb / s) is converted to 64 kb / s.

In the configuration shown in FIG. 2 (b), a digital switch is a multi-source switch capable of exchanging sub-rate data of 64 kb / s or less, such as 32 kb / s, and 32 kb / s after the switch. s vs. 64 kb / s or 16
Various different speed conversion trunks such as kb / s vs. 64 kb / s are installed. Then, by a multiple switch, a low bit rate (for example, 32 kb / s or 16 kb / s) c
This is a method in which h is classified by speed, connected to a corresponding trunk, the speed of each bit rate is converted to 64 kb / s, exchanged again by a multiple switch, and sent to the ISDN exchange.

The configuration shown in FIG. 2 (c) is 64 kb / s.
64 kb / s or less (eg 3
2 kb / s, 16 kb / s, 8 kb / s) A common trunk consisting of multiple switches capable of exchanging sub-rate data and various speed conversion trunks is installed, sub-rate exchange and speed conversion are performed within the common trunk, and It is a method of exchanging with a digital switch and sending it to an ISDN exchange.

[0006]

In the structure shown in FIG. 2A, since the speed converting unit is compatible with all speed conversion,
Since it is necessary to prepare the maximum number of channels for the line between the speed converter and the digital switch, a large-capacity subscriber communication highway and a digital switch are required on the switch input side. Moreover, in the configuration shown in FIG. 2B, the number of terminals accommodated in the multi-source switch increases. That is, a large capacity multi-element digital switch is required. Figure 2
In the configuration shown in (c), when the mobile subscriber changes the companding rule for each time period, the trunk to be used changes, so it is necessary to provide a plurality of trunks to cover this trunk. However, there is a problem that the amount of hardware prepared in advance on the device side increases. That is, each system accommodates subscribers having different speeds, and thus has a problem that the amount of hardware increases.

Due to the recent technological progress, the DSP (digital signal processor) has been improved in function / miniaturization, and it has become possible to mount a speed conversion function at the time of accommodating a mobile terminal in a subscriber circuit. In this case, as shown in FIG.
The line-compatible speed conversion unit having the configuration of (a) can be incorporated into the subscriber circuit, and line-compatible speed conversion can be realized at low cost. However, the speed conversion rule is changed in the subscriber circuit due to the difference in traffic conditions such as daytime and nighttime (for example, subrate data of 32 kb / s at night is changed to 1 daytime).
When increasing the number of subscribers that can be connected between a subscriber and a base station (used at 6 kb / s), that is, increasing the traffic capacity, the number of channels handled by the subscriber circuit is (for example, 32 kb / s at night, What was 4ch, but 16 in the daytime
kb / s, 8ch). For this reason,
Subscriber circuit has the maximum number of channels (for example, 8ch during daytime)
Must be configured to be sent to the subscriber call highway, and the subscriber call highway between the subscriber circuit and the concentrator switch has a low line efficiency and a large number in order to secure the maximum number of channels for the line. It will be of scale. In addition, at present, it is a transitional period in which the service of subscribers is shifting from the conventional analog telephone to the digital terminal, and many subscribers are shifting from the analog telephone to the digital terminal in the future. Subscriber circuit for analog telephones (64 kb / s, 1 ch) to subscriber circuit for basic digital terminals (64 kb / s, 2 ch)
When a certain subscriber moves to, the number of channels handled by the subscriber circuit also changes from 1ch to 2ch. In this case as well, the subscriber circuit has the maximum number of channels as in the case of accommodating mobile subscribers. It is necessary to configure in advance that a certain 2ch can be sent to the subscriber call highway. As described above, in the subscriber line concentrator, the subscriber circuit in which the number of channels changes every time period such as a mobile base station, and the function of responding to the change in the number of channels accompanying the change of the subscriber type from analog to digital The need increases. For this reason, if the maximum number of channels for each subscriber circuit is secured on the subscriber communication highway between the subscriber circuit and the concentrator switch, the subscriber communication highway will be highly redundant and large-scaled. The number of terminals accommodated in the digital switch also increases.

As described above, the object of the present invention is to improve the usage efficiency of the subscriber call highway and increase the amount of hardware of the subscriber call highway and the digital switch in the exchange accommodating the subscriber whose number of channels changes. Suppress. Further, it is possible to prevent the control process from becoming complicated due to the variable channel subscribers concentrating. That is, it is to realize a concentrating system for variable channel subscribers without complicating the control from the control processing unit in the conventional exchange.

[0009]

To achieve the above object, in a subscriber line concentrator / switcher comprising a subscriber circuit, a subscriber communication highway, and a subscriber line concentrator switch, a subscriber that passes voice / data of the subscriber. A subscriber circuit capable of sending voice / data to a designated TS position on the caller highway and a function for constantly monitoring the usage status of the TS on the caller highway, that is, on the caller highway The function to monitor the empty TS is provided, and based on the result of monitoring,
By dynamically allocating the TS on the subscriber communication highway for each ch when the subscriber makes a call for each call, it is possible to effectively use the communication path highway.

[0010]

When a call is made, an arbitrary vacant TS can be assigned according to the state of the call. Therefore, even if a plurality of subscribers with different numbers of channels make a call at any timing, the TS on the subscriber call highway Since it is possible to find a vacant space and insert voice and data, the highway TS can be effectively used. That is, in the subscriber line concentrator / switcher that accommodates the subscriber circuit, while the number of subscriber call highways can be reduced, the call of each subscriber can be accommodated without performing the speed adjustment shown in the prior art. In this way, by absorbing the fluctuation of the number of subscribers' channels by the channel highway, it is possible to realize a flexible subscriber line concentrating switch with a minimum channel highway and a switch scale. Further, it is possible to easily deal with a change in the number of channels used in the subscriber circuit, as the subscriber is shifting from analog to digital.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the subscriber line switching device according to the present invention will be described below.

FIG. 1 shows the basic configuration of the exchange channel device, which comprises a concentrating stage channel 1 and a distribution stage channel 2. Here, line 1
Is for converging traffic according to the call rate of the subscriber line, and is a part for realizing the variable channel subscriber line concentrating system according to the present invention. Further, the distribution stage speech path 2 is an exchange switch having a function of exchanging and connecting the above-mentioned concentration stage speech path 1 and a relay line, between the concentration stage speech paths 1 and between the relay lines.

The subscriber concentrator switching device corresponds to the concentrator stage channel 1 of the exchange channel device shown in FIG. 1, and includes a subscriber circuit 11, a subscriber conversation highway 12, a concentrator switch 13, and a controller. It is composed of 14.

The subscriber circuit 11 is an analog (64 kb /
s × 1ch), basic digital (64 kb / s × 2c)
h), digital of primary group or higher, mobile, leased line, AT
It is a circuit for accommodating subscribers having a wide variety of used channels such as M, and has a common interface (64 kb / s × n).
ch; an integer of n ≧ 1), and is connected to the subscriber communication highway 12 as shown in FIG.

Further, the subscriber circuit 11 has a function of transmitting voice / data to a designated TS on the subscriber communication highway 12. That is, the subscriber call highway 12 according to the present invention is used for each subscriber call request or during connection (during or during a call) to the subscriber call highway 1.
It is a variable TS assignable highway that can assign a subscriber's ch to any TS on 2 above, and is realized by the operation described below.

First, in response to a connection request (calling) (FIG. 1) from the subscriber circuit 11, the control unit 14 causes the subscriber number of the calling subscriber and the ch number of the connection request of the subscriber. (Since a subscriber has one or more channels,
At the time of calling, it is necessary to simultaneously recognize the subscriber number and the ch number of the connection request), and the TS position on the subscriber communication highway 12 that can be assigned to the subscriber is designated to the subscriber circuit 11 (FIG. 1). . Next, the subscriber circuit 11 sends the voice / data to the designated TS (FIG. 1).

As described above, since the TS on the subscriber communication highway is allocated to each of the called channels, the subscriber communication highway does not prepare subscribers without accommodating all the number of channels of each subscriber. Can be accommodated.

That is, in the conventional fixed TS allocation method in which the TS position on the subscriber communication highway used by each subscriber circuit is predetermined, a variety of subscriber circuits with different numbers of used channels are Type of accommodation position (ch
The number of subscribers has been limited, and the number of subscribers has been set to the maximum number of channels x TSs for all subscribers. According to the present invention, when compared with this conventional method, the subscriber communication highway is not affected by the number of channels of each subscriber, so that the accommodation position of the subscriber circuit is limited by the type (number of channels). It is possible to accommodate a wide variety of subscriber circuits having different numbers of used channels without preparing a maximum number of channels of subscribers × TS for all subscribers.

Also, the TS on the subscriber calling highway 12
Even if the number is fixed, since the TS can be effectively allocated only to the calling subscriber, the subscriber calling highway 1
It is possible to configure the subscriber communication highway 12 with the number of TSs smaller than the total number of subscriber circuits accommodated in 2 × the number of channels of each subscriber. That is, the line 1
Since it is possible to reduce the number of subscriber communication highways 12 as a whole, the size of the concentrator switch 13 can be reduced.

Conventionally, when a subscriber calls / ends a call (requests to connect / release), a subscriber number (including a ch number) and a highway number on the distribution stage side are designated in the concentrator stage communication path 1. By connecting / disconnecting to the distribution stage. However, according to the present invention, although the configuration of the concentrating stage communication path 1 can be remarkably simplified as described above, on the other hand, in addition to the highway number and the subscriber number (including the ch number) on the distribution stage side, a new subscriber is added. Setting of TS on highway 12
It is necessary to perform control to perform release (TS allocation / transmission of release information). Therefore, an embodiment will be described below in which this control is simply performed without complicating the conventional exchange control.

The setting / release of the TS on the subscriber call highway 12 is performed by the switching software for managing the entire call path device (the exchange call path device consisting of the concentrator stage call path 1 and the distribution stage call path 2 is replaced). There is a method of determining with software for controlling (not shown in FIG. 1), and a method of performing with the control unit 14 of the concentrator communication path 1 of this communication path.

In order to reduce the processing load of the exchange software, in the system in which the TS on the subscriber call highway 12 is set / released by the exchange software, (1) the exchange call software is used to manage the subscriber call highway. The setting is performed, but the control unit 14 performs the release, and (2) the subscriber communication highway is managed by the switching software and the TS is set, but the release is performed by the subscriber circuit detecting the end call and opening the TS autonomously. There is a method to do. Further, in the method performed by the control unit 14, (3) the control unit 1
4 manages the subscriber call highway 12 and sets / releases the TS on the subscriber call highway 12. The means for realizing these methods will be described below.

First, one embodiment of a system (the above (1)) in which the subscriber call highway is managed by the switching software and the TS is set, but the control unit 14 opens it will be described.

FIG. 3 is a block diagram showing an embodiment of a system in which the switching call software manages the subscriber communication highway and sets the TS, but the control unit 14 releases it. In response to the connection request from the subscriber circuit 11, the switching software determines the TS position on the subscriber communication highway and notifies the control unit 14 of the TS position. In the control unit 14, the number and ch of the calling subscriber of the used TS holding memory 141 holding the TS on the subscriber communication highway used by the subscriber.
At the address of the number, the TS position on the subscriber communication highway notified by the exchange software is written as data.
As a result, the TS position of the subscriber communication highway used by the ch of the subscriber is written in the used TS holding memory 14. On the other hand, the control unit 14 notifies the subscriber circuit of the TS on the subscriber communication highway. The subscriber circuit sends the data to the TS on the notified subscriber talking highway. At the time of call termination, the subscriber circuit notifies the control unit 14 of a release request (call termination) and the subscriber number and ch number, and the control unit reads the contents of the subscriber number and ch number addresses of the used TS holding memory 141. As an open TS,
The subscriber circuit is notified (TS release position designation), and the subscriber circuit releases the designated TS used (TS used).

[0025] Next, the switching software manages the subscriber call highway and sets the TS, but the opening is performed by the subscriber circuit detecting the end of call and autonomously opening the TS (above (2)). An example will be described.

FIG. 4 is a diagram for explaining an embodiment of a system in which the switching of the subscriber communication highway is managed and the TS is set by the switching software, but the subscriber circuit detects the end of call and autonomously releases the TS. Is. At the time of calling, the switching software determines the TS position on the subscriber communication highway in response to the connection request from the subscriber circuit 11 and notifies the subscriber circuit. The subscriber circuit sends voice / data to the TS on the notified subscriber communication highway. Up to this point, the method is the same as the method of managing the subscriber call highway and setting the TS by the above-mentioned exchange software (1), and the operation thereof is also the same as in FIG. However, at the time of call termination, when the subscriber circuit detects the call termination (call termination), the subscriber circuit autonomously releases the subscriber communication highway (use TS release). In this case, the control unit 14 does not perform any TS management of the subscriber calling highway.

Next, the control section 14 manages the subscriber call highway 12 and the TS on the subscriber call highway 12 is managed.
An example of the method (the above (3)) of setting / releasing the above will be described.

FIG. 5 shows an embodiment of a subscriber call highway TS (hereinafter referred to as "HWTS") setting / release system in which the control section 14 sets the TS on the subscriber call path highway 12 in detail. It is a block configuration diagram, HWTS
The setting / release circuit uses the HWTS number as an address, and has the subscriber number and ch number as data. The HWTS control memory 4 indicates the use state of each TS on the subscriber communication highway.
1 and the selection circuit 42 operating with the logic shown in FIG.
"S control memory 41 output" and "selection circuit 42 output B"
And a counter 43 for sequentially counting up the address of the HWTS control memory 41, that is, the HWTS number, and an AND gate 45 for inputting the output of the comparator 43 and the value of the counter 44. , HW
A timing circuit 46 that delays the output value of the comparator 43 to create a write timing to the TS control memory 41.
It is composed of

In this configuration, when a subscriber having a certain number of channels makes a call, the subscriber circuit is set by the subscriber circuit in order to set the HWTS that assigns the channel that the subscriber wants to connect to the TS of the subscriber communication highway. Subscriber number and channel number to connect (subscriber number + channel number to connect to SL below)
No. S) is notified to the control unit 14 (FIG. 1).
The control unit 14 inputs the HWTS setting order to the selection circuit 42. At this time, the selection circuit 42 outputs an empty pattern to the output B according to the logic of FIG. From the HWTS control memory 41, at an appropriate cycle (for example, 16 ms which is the cycle of the scan circuit for detecting the calling of the subscriber, or 125 μ which is one frame cycle of the subscriber calling highway).
s) Sequentially read outputs, ie each T
The use state of S is compared by the comparator 43 with the empty pattern.

Here, at a certain counter value N, HW
When the output of the TS control memory 41 matches the empty pattern, that is, when the TS is empty, the output of the comparator 43 is "1". As a result, the AND gate 45
The counter value N at this time, that is, the number of the empty TS is output. When this is set as the HWTS setting number and notified to the subscriber circuit (LEN in FIG. 5) (FIG. 1), the subscriber circuit
As shown in FIG. 1, the HW in which the data of the subscriber is designated
Put in TS, that is, set HWTS. Also,
At the same time, the output “1” of the comparator 43 is output to the timing circuit 46.
And becomes a write control signal for the HWTS control memory 41. At this time, the counter value N at this time is input to the address of the HWTS control memory 41, and the data is SLNo. S has been entered. As a result, at the address N of the HWTS control memory 41, the SLNo. S will be written and it will be written which channel of which subscriber the HWTS is used for.

On the contrary, when opening the HWTS, the SLNo. S and HWTS release order selection circuit 42
To enter. The selection circuit 42 outputs the output B according to the logic of FIG.
SL No. Output S. On the other hand, the output (the usage state of each TS) sequentially read from the HWTS control memory 41 in the same manner as when the HWTS is set is output to the SLNo. Compared to. Here, at a certain counter value M, SLNo. When the output of S and the HWTS control memory 41 match, that is, when the subscriber to be released and the ch number match the subscriber using the TS held in the HWTS control memory and the ch number, the comparator 43 The output becomes "1". As a result, the AND gate 45 outputs the counter value M at this time, that is, the number of the TS to be released. This is used as the HWTS release number, and the HWTS is released in the same procedure as when setting. At the same time, the output “1” of the comparator 43 passes through the timing circuit 46 and becomes the write control signal of the HWTS control memory 41. At this time, HWTS
The counter value M at this time is input to the address of the control memory 41, and the empty pattern which is the output A of the selection circuit 42 is input to the data. As a result,
An empty pattern is written in the address M of the HWTS control memory 41, indicating that the HWTS is unused.

In this way, the SLN to be connected / opened
o. By giving the above, the control unit 14 can set / release the HWTS. The HWTS control memory 4
1's are read out sequentially and repeatedly at appropriate intervals. Therefore, when the calling state of the subscriber changes over time, a vacant TS is found while the used TS is used.
Can be empty. By this operation, even if the number of TSs on the subscriber talking highway is constant, the TSs can be effectively allocated only to the subscriber ch that is calling and talking, so that the subscriber talking highway can be effectively used.
That is, it is possible to allocate the channels of various subscribers having different numbers of used channels for each subscriber to an appropriate TS on the subscriber communication highway for each call, so that various subscribers can be accommodated easily. Further, for example, since the usage pattern is different for each time like a multimedia terminal, the usage c
It is possible to flexibly accommodate subscribers whose number of h changes.

Further, FIG. 7 shows a block diagram of an exchange communication channel device in the case where a base station of a mobile terminal is used as a subscriber and terminated by a subscriber circuit such as basic digital. Mobile terminal 16
The wireless communication is performed between (hereinafter PS) and the base station 15 (BS). Transmission between the BS 15 and the subscriber circuit 11 is performed at the basic digital line speed of 2B + D. In order to effectively use the line, the voice signal is compressed and the Bch is divided and used (eg, per Bch). Line speed 64
32kb / s × 2ch is used at kb / s)
I do. The voice signal transmitted from the BS 15 is expanded by the speed conversion circuit in the subscriber circuit to 64 kb / s which is the minimum handling speed of the switching device, and sent to the subscriber communication highway. If there is a large amount of traffic between the BS 15 and the subscriber circuit 11 during the daytime in a large city, the compression speed is reduced (16 kb / s, 8 kb / s, etc.) and the number of channels per BS is increased. , It is possible to transmit more voice. An example of this will be described with reference to FIG. In FIG. 7 (a), 32 channels of 1ch are connected between the BS 15 and the subscriber circuit 11.
A normal case of transmitting at a speed of kb / s is shown. In this case, 4 channels can be transmitted per 1 BS. Since the exchange device exchanges a speed of 64 kb / s as the minimum handling unit, the speed conversion circuit 111 in the subscriber circuit 11 is replaced.
Converts from 32 kb / s to 64 kb / s and sends it to the subscriber call highway 12. As a result, 64 kb / s × 4 ch will be transmitted to the subscriber communication highway. In FIG. 7B, BS1 is used in order to effectively use a further line between the BS 15 and the subscriber circuit 11 during the busy hour.
The case where data is transmitted between 5 and the subscriber circuit 11 at a rate of 8 kb / s per channel is shown. In this case, 16c per BS
h can be transmitted. The speed conversion circuit 111 in the subscriber circuit 11 performs 8 kb / s → 64 kb / s conversion and sends it to the subscriber communication highway 12. As a result, 64 kb / s × 16 ch is transmitted to the subscriber communication highway during the busy hour.

As a result, the number of channels (the number of subscribers) that the BS can handle depends on the transmission rate during the daytime (the busiest time) and at night (the offtime).
For example, by changing the companding rule when the call volume is different, it is possible to increase the number of channels that can be transmitted during the busy hour. Thus, in the case of an exchange communication channel device in which a base station of a mobile terminal is used as a subscriber and terminated by a subscriber circuit such as basic digital, the number of channels handled by the subscriber circuit may change depending on the time zone. There is a nature.

In the present invention, even when the number of channels handled by the subscriber circuit changes depending on the time zone, the above H
By the operation of the WTS control memory 41, it is possible to easily allocate and use an appropriate TS on the subscriber call highway.

A flow showing the manner of change in TS allocation from the subscriber's connection request to the opening according to the present invention when the number of channels handled by the subscriber circuit changes depending on the time zone will be described with reference to FIG. To do. The subscriber A is making a call by connecting 1ch. At this time, TSn of the subscriber calling highway is used (state). Next, the subscriber A ends the call (ends the call), and TSn of the subscriber call highway
Becomes empty (state). After this, the subscriber B makes a call and uses the TSn of the subscriber communication highway (state). After that, the subscriber A makes a call again. in this case,
Subscriber A is requesting a service (multimedia service or the like) using 2ch, unlike the last call. At this time, TSm and TSl of the subscriber calling highway
The subscriber A is accommodated by allocating.

Further, this system can be realized by firmware instead of the hardware shown in FIG. 5, and an example of the flow chart in that case is shown in FIGS. 9 and 10. As in FIG. 5, the contents of the HWTS control memory 41 (vacant / used subscriber, ch) are constantly monitored and, depending on the calling state of the subscriber, an empty TS of the subscriber calling highway is displayed.
The HWTS is set / released by allocating the channel used by the subscriber to.

When the control unit 14 sets / releases the HWTS, the state of each TS of the HWTS is determined by the control unit 14.
The control unit 14 also has to perform control at the time of congestion.

This control method at the time of congestion will be described with reference to FIGS. 11 to 13 of the embodiment.

FIG. 11 shows BT (Busy To) at the time of congestion.
FIG. 3 is a diagram showing a transmission method of (ne), and when the control unit 14 detects congestion of the subscriber's speech path highway 12, it sends BT to the newly calling subscriber to notify that the line is blocked. It is a thing. At this time, the BT is transmitted to a specific TS position in advance (FIG. 11), and for a new call (FIG. 11), the control unit 14 notifies the TS number indicating the position of this BT. By (Fig. 11),
BT can be sent to the subscriber.

FIGS. 12 and 13 are block configuration diagrams showing an embodiment in which the congestion detection circuit is realized by a hard disk.

FIG. 12 shows the HWTS setting / release method shown in FIG. 5, which is realized by adding a congestion monitoring bit to the HWTS control memory 41 and adding a congestion monitoring bit write selection circuit 47 and a congestion monitoring circuit 48. Is. In this configuration, SLNo. And the congestion monitor bit “1” created by the congestion monitor bit write selection circuit 47 is added and written in the HWTS control memory 41. This bit is monitored by the congestion monitoring circuit 48, and all the congestion monitoring bits are "1" (or there is no "0") during one sequential read cycle of the HWTS control memory 41. To detect congestion and monitor congestion. The control unit that has detected the congestion notifies the switching software that manages the entire communication path of the congestion, and the subscriber circuit that newly made the call is notified of the number of the TS from which the BT is transmitted. To notify. As a result, since the BT is sent to the newly called subscriber, the subscriber can know that the subscriber is in a congestion state. In this way, the BT TS, which was conventionally distributed by the concentrator switch 13, can be easily distributed by the subscriber's communication path highway.

FIG. 13 shows a method of monitoring the presence or absence of an empty pattern for one read cycle of the HWTS control memory and detecting congestion when there is no empty pattern. The output of the comparator 43 and the HWTS. When the operation clock (hereinafter CLK) of the counter that creates the address of the control memory and the HWTS setting / release order are not HWTS release (that is, H
An AND gate 49 having an input terminal that becomes "1" in the case of WTS setting and a normal state and an output of this AND gate 49 are input to the clock terminal, and a flip-flop 50 fixed to "0" is added to the data terminal. By doing so, congestion detection is realized. Specifically, according to the logic of FIG.
The output B of the selection circuit 42 outputs a vacant pattern except when the HWTS is opened. As a result, the comparator 43
Except when the TS is open, the empty pattern is compared with the contents of the HWTS control memory. If there is an empty HWTS,
Outputs "1". Further, the output of the AND gate 49 takes in the input “0” of the flip-flop 50 by CLK and outputs it to the output terminal on condition that the output of the comparator 43 is “1” except when the HWTS is opened. As a result, if the output of the flip-flop 50 is "0", there is still an empty HW.
The TS exists, that is, it is not in the congestion state. This is monitored for one cycle of the HWTS control memory read cycle, and if the output of the flip-flop is "0", the flip-flop is set and the output is set to "1" and the monitor state is set again. If this output is "1", it means congestion,
By notifying that there is congestion to the switching software that manages the entire communication path, while notifying the subscriber circuit that newly made the call, the number of the TS where the BT is transmitted,
The sending of BT to the subscriber to notify the congestion state is the same as in FIG.

Further, in the BT transmission method described above, since new calling subscribers are connected to TSs to which BTs are transmitted one after another during congestion, 1TS (that is, BTs are transmitted to the subscriber's communication highway). TS) will be used by multiple subscribers. One of the subscriber calling highways,
The present invention can be applied to a broadcast type service in which the TS is used by a plurality of subscribers. This one embodiment will be described. FIG. 14 shows an embodiment in which a plurality of subscribers receive a common time signal notification service. For such a service, in addition to this, for example, weather forecast, traffic information, etc. can be considered. Similar to the BT transmission method described above, this information can be easily realized by allocating this information to a specific TS instead of the BT.

When a dedicated line is introduced into the subscriber concentrator switching device that can freely assign the subscriber's ch to the HWTS as described above, in order to prevent disconnection or momentary interruption of the dedicated line. However, it is necessary to fixedly allocate the TS instead of setting / releasing each call and guarding the HWTS so that the HWTS is not released even when the call ends. Therefore, a specific embodiment will be described with reference to FIGS. 15 and 16 for the HWTS protection method for the dedicated line when the dedicated line is introduced. Figure 1
5 is an HWT in the HWTS setting / release method of FIG.
The S control memory 41 is provided with an identification bit for identifying a dedicated line (fixed TS allocation) and a general subscriber (TS allocation for each call),
An AND gate 51 having fixed bits of the output of the HWTS control memory 41 and the output of the comparator 43 as input terminals;
The fixed bit (identification bit) of the output of the HWTS control memory 41 is added to the input terminal of the AND gate 45 to realize the protection of the HWTS for the dedicated line, and the operation will be described below.

Normally, when opening the HWTS, the SL to be opened
No. And the output of the HWTS control memory 41 are compared, and if the contents match, the output of the comparator 43 becomes "1",
HWTS open. However, at this time, if the output of the fixed bit is "0" which means accommodation of the dedicated line, the AND gate 45 does not output the position of the HWTS, and the AND gate 51 also outputs the write control signal of the HWTS control memory 41. Do not output. Therefore, a fixed bit with "0" entered is not output as an open HWTS, and HWTS
Rewriting of the TS control memory 41 is protected. That is,
The dedicated line will not be disconnected, and there will be no momentary interruptions due to TS position changes.

Further, FIG. 16 is realized by adding a dedicated line or an identification bit for identifying a general subscriber to the output B of the selection circuit 42, and its operation will be described below. When it is desired to set the HWTS by calling the general subscriber, the output B of the selection circuit 42 outputs a vacant pattern according to the logic of FIG. The recognition bit “1” is added to this and the result is input to the comparator 43. On the other hand, in the present configuration, the identification bit "1" is added to the empty pattern of the output of the HWTS control memory 41. Therefore, when it matches the empty pattern, similar to the above-described setting / release operation of the HWTS. HWTS can be set. However, even if an attempt is made to open the HWTS in which the private line is accommodated, the operation is protected as described below. That is, when it is desired to release a subscriber, the selection circuit 42 is operated according to the logic of FIG.
The output B of SLNo. Is sent. Even if “1” which means a general subscriber is added to the identification bit and is input to the comparator 43, the SLNo.
When the private line is accommodated and protected, the identification bit is "0", which means that the private line is accommodated. Therefore, SLNo. HW
The comparator 43 inside the TS control memory 41 has different fixed bits and does not output the coincidence of contents. That is, since the AND gate 45 does not operate, the HWTS is not released,
Further, the HWTS control memory is not rewritten. That is, similar to the operation of the configuration shown in FIG. 15, it is possible to protect a specific subscriber (dedicated line or the like).

The means for implementing various services such as congestion control has been described above with reference to FIGS. 11 to 16 by focusing on the operation of the HWTS control memory 41 shown in FIG. It is obvious that the service can be realized by the firmware as the hardware realizing method of FIG. 5 can be realized by the firmware shown in FIGS.

[0049]

As described above, according to the present invention,
Since TSs on the subscriber communication highway are allocated for each called channel, the subscriber highway prepares all the TSs for the number of channels required by the accommodated subscribers, or a fixed TS allocation for limiting the accommodating position of the subscribers. Compared with the system, the number of channels used is different without restricting the accommodation position of subscribers by type (number of channels), or preparing the maximum number of channels of subscribers × TS for all subscribers. Can accommodate subscribers.

FIG. 17 shows an example of comparison between the fixed TS allocation method and the method of the present invention. FIG. 17 is a subscriber line concentrator / switcher in which analog telephones and digital terminals coexist, and when the number of subscribers is 50, the ratio of analog subscribers to digital subscribers (digital subscriber / all subscribers) is “0”, ”
It shows the relationship between the call rate and the required number of subscriber call highway TSs when it changes between 0.1 "and" 0.3 ".
As can be seen from FIG. 17, in the variable TS allocation method, the number of TSs required for the subscriber call highway decreases as the call rate decreases, and the subscriber line concentrator is constructed with a configuration smaller than that of the fixed TS allocation method. it can.

Other effects will be listed below.

(1) The number of channels handled by the subscriber circuit changes depending on the time zone, such as an exchange speech path device when the base station of the mobile terminal is used as a subscriber and terminated by the subscriber circuit such as basic digital. Even if there is a possibility, it is possible to use by assigning it to an appropriate TS on the subscriber calling highway.

(2) Even if the TS of the subscriber call highway is constant, the TS can be effectively assigned only to the calling subscriber, so that the subscriber call highway can be constructed with a smaller number of TSs than the conventional one. , It becomes possible to effectively use the subscriber calling highway.

(3) By the above, it is possible to reduce the subscriber communication highway and further downsize the concentrator switch.

(4) As described above, it is possible to remarkably simplify the structure of the concentrator communication path.

(5) The control section does not complicate the conventional exchange control by allocating the TS on the subscriber communication highway.

(6) It is possible for the control unit to also monitor the congestion of the subscriber communication highway, and the subscriber can easily be notified of the congestion by sending BT.

(7) The above BT transmission system can be applied to be applied to a broadcast type service.

(8) By providing a protection function for the dedicated line, the dedicated line is not cut or instantaneously cut.

[0060]

[Brief description of drawings]

FIG. 1 is a schematic diagram of the present invention.

FIG. 2 is a diagram showing a conventional method.

FIG. 3 is a diagram showing an embodiment of a system in which a subscriber call highway TS is set by exchange software and opened by a control unit.

FIG. 4 is a method 1 in which a subscriber call highway TS is set by switching software and opened by a subscriber circuit autonomously.
The figure which showed the Example.

FIG. 5 is a block diagram showing an embodiment of a HWTS setting / release system.

FIG. 6 is a state transition diagram showing the operation of the HWTS setting / release system.

FIG. 7 is a configuration diagram of a switching device when a base station of a mobile terminal is terminated by a subscriber circuit.

FIG. 8 shows channels handled by a subscriber circuit according to time zones.
T from the connection request of the subscriber to the release when the number changes
The figure which shows the mode of change of S allocation.

FIG. 9 is an explanatory diagram showing a processing example (1) when HWTS setting / release is performed by firmware.

FIG. 10 is an explanatory diagram showing a processing example (2) in the case of performing HWTS setting / release with firmware.

FIG. 11 is a diagram showing control during congestion.

FIG. 12 is a block diagram (1) showing an embodiment of a congestion monitoring circuit.

FIG. 13 is a block diagram (2) showing an embodiment of a congestion monitoring circuit.

FIG. 14 is an explanatory diagram showing a situation in which a plurality of subscribers receive a common time signal notification service.

FIG. 15 is a block configuration diagram (1) showing an embodiment of a dedicated line protection circuit.

FIG. 16 is a block diagram (2) showing an embodiment of a dedicated line protection circuit.

FIG. 17 is a diagram showing the effect of the present invention.

[Explanation of symbols]

 1: Concentration stage communication path 2: Distribution stage communication path 11: Subscriber circuit 12: Subscriber communication highway 13: Concentration switch 14: Controller 15: Base station 16: Mobile terminal 41: HWTS control memory 42: Selection circuit 43: comparator 44: counter 45: AND gate 46: timing circuit 47: congestion monitor bit write selection circuit 48: congestion monitor circuit 49: AND gate 50: flip-flop 51: AND gate 141: used TS holding memory

Claims (13)

[Claims] 1. When a basic unit of one service allocation for one subscriber is one channel (hereinafter referred to as ch), a subscriber concentrating exchange accommodating various subscriber circuits having different numbers of used channels for each subscriber. In the device, a subscriber call highway and a concentrating switch capable of dynamically allocating a channel used by the subscriber for each call to an arbitrary time slot (hereinafter referred to as TS) on the subscriber call highway according to a call state. A switching device for a subscriber line concentrating circuit. 2. The switching device according to claim 1, wherein it is possible to accommodate a subscriber whose number of channels used by a certain subscriber changes with time. 3. The switching device according to claim 1, wherein the TS
A free pattern indicating unused and subscriber's subscriber number and c
Selector means for selecting the h number in accordance with the state of the call, HWTS control memory having the output of the selector means as data with the TS position of the subscriber call highway as an address, and the address is given to the HWTS control memory. Address generating means, comparing means for comparing the output of the HWTS control memory with the output of the selecting means, and when the comparing means detects a match in the comparison result, outputs the output of the address generating means to the subscriber circuit. HWTS control memory write timing control means for writing the output of the selecting means and the output of the selecting means into the HWTS control memory, and dynamically changes an arbitrary TS on the subscriber call way according to the call state of the subscriber. Call highway TS to set or release
A switching device for concentrating subscriber lines, comprising setting / opening position determining means. 4. The call highway TS setting / release position determining means (hereinafter referred to as HWTS setting / release position determining means) according to claim 3, wherein when the HWTS is set, the selecting means sets the subscriber number and ch number of the subscriber to the HWTS. When the output of the HWTS control memory is detected as an empty pattern, the output of the address generating means is added to the control memory. The subscriber number and the ch number in the HWTS control memory,
When the WTS is opened, the selection means sets the empty pattern to the H level.
The subscriber number and ch number of the subscriber are input to the WTS control memory, and the comparing means inputs the subscriber number and ch number of the subscriber, and the comparing means outputs the output of the HWTS control memory to the subscriber number and c of the subscriber.
When it is detected that the call is an h-number call, the HWTS setting / release position determining means is provided for outputting the output of the address generating means to the subscriber circuit, while writing an empty pattern in the HWTS control memory. Switching device for concentrated subscriber lines. 5. The HWTS setting / release position determining means according to claim 3, wherein a congestion monitoring bit is added to the HWTS control memory, and a congestion monitoring section is provided at the output of the HWTS control memory to carry out the congestion monitoring control. A switching device for concentrating subscriber lines, characterized by having HWTS setting / release position determining means. 6. The HWTS setting / release position determining means according to claim 3, wherein a detecting means for detecting the presence / absence of an empty pattern in the HWTS control memory is provided to detect congestion and carry out congestion monitoring control. A switching device for concentrating subscriber lines, characterized by having HWTS setting / release position determining means. 7. The switching device according to claim 1, wherein a BT is assigned to a pre-specified TS in order to send a busy tone (BT) to a newly calling subscriber when the call highway is congested. A subscriber line switching device having a subscriber telephone call way for transmitting BT from the TS. 8. The HWTS setting / release position determining means according to claim 3, wherein a TS of a call highway is provided in order to provide a service for always connecting all or some of the channels used by a subscriber. In addition to fixed allocation of a part of the above, fixed allocation is also possible so that any TS on the subscriber call highway can be dynamically set or released according to the call status of general subscribers. And TS
2. A switching device for subscriber line concentrating, comprising a call highway TS setting / release position determining means provided with the protection means of FIG. 9. The fixed allocation according to claim 8 is TS.
2. The switching device for subscriber line concentrating device, characterized in that it has a fixed bit in the HWTS control memory and has a call way way TS setting / release position determining means which is implemented by write-protecting with this bit. 10. The call highway TS setting / release position determining means according to claim 3, wherein the HWTS control memory has a subscriber number and a ch number as an address and a call highway TS position as data. A subscriber characterized by having a call highway TS setting / release position determining means for performing an autonomous release operation by outputting data of a call highway TS to be released by giving a subscriber number and a ch number to be released to an address. Concentrator exchange device. 11. The switching device according to claim 1, wherein all or some of the channels used by the subscriber are 1 to n,
A switching device for subscriber line concentrating, which has a subscriber communication highway for accommodating a broadcasting service which is always connected to a specific TS. 12. A system for communicating with a subscriber terminal by providing a plurality of sub-channels having a speed lower than the basic speed in a basic channel and converting the basic channel to a basic speed in the NW for communication to change the speed or the companding rule. A switching device in which the conversion is performed in a subscriber circuit unit and is combined with one or any number of claims 1 to 11. 13. The mobile station according to claim 12, wherein the mobile base station is accommodated as a subscriber, and a plurality of band-compressed channels are communicated between the base station and the exchange by using a sub-channel, and in the subscriber circuit. A switching device having a function of converting the signal speed to a reference signal speed in the switch, and combining one or any one of the claims 1 to 11.