JP3287051B2 - Switching equipment for subscriber line concentrator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subscriber line switching system, in which the number of voice and data channels used by a subscriber is:
The present invention relates to an accommodating method for accommodating various subscriber circuits different for each subscriber and a subscriber circuit in which the number of channels used by some subscribers changes with time and a control method thereof.

[0002]

2. Description of the Related Art As a conventional system of a subscriber concentrator switching apparatus accommodating various subscriber circuits in which the number of voice and data channels used by a subscriber differs for each subscriber, "-Special Issue-Evolving" Personal Communication ”(Nikkei Communication 199
1.2.18 pages 52 to 72) describe a mobile phone system. Thus, a method for accommodating mobile services in a basic digital circuit and performing a rate conversion outside the subscriber circuit in a method of accommodating a subscriber when the number of accommodated mobile subscribers varies with the traffic volume. (FIGS. 2A to 2C). Think like. This prior art will be described below.

The configuration shown in FIG. 2A is 64 kb / s
A speed conversion circuit is installed in front of the digital switch, and the sub-rate data of 64 kb / s or less is provided by this circuit.
(For example, 32 kb / s) is converted to 64 kb / s.

The configuration shown in FIG. 2B employs a multi-switch capable of exchanging sub-rate data of 64 kb / s or less, for example, 32 kb / s, for the digital switch, and 32 kb / s after the switch. s to 64 kb / s or 16
Install various different speed conversion trunks, such as kb / s versus 64 kb / s. Then, by the multiple switch, the c of low bit rate (for example, 32 kb / s or 16 kb / s)
h is classified by speed, connected to the corresponding trunk, the speed of each bit rate is converted to 64 kb / s, exchanged again by the multiple switch, and sent to the ISDN exchange.

The configuration shown in FIG. 2C is 64 kb / s
64 kb / s or less (for example, 3
A common trunk consisting of a multiple switch capable of exchanging subrate data (2 kb / s, 16 kb / s, 8 kb / s) and various speed conversion trunks is installed. Subrate exchange and speed conversion are performed in the common trunk, and the operation is repeated. In this method, the data is exchanged by a digital switch and sent to an ISDN exchange.

[0006]

The configuration shown in FIG. 2A is such that the speed conversion unit can handle all speed conversions.
Since it is necessary to prepare the maximum number of channels between the speed converter and the digital switch corresponding to the line, a large-capacity subscriber communication highway and digital switch are required on the switch input side. Further, in the configuration shown in FIG. 2B, the number of terminals accommodated in the multiple switch is increased. That is, a large-capacity multiple digital switch is required. FIG.
In the configuration shown in (c), when the mobile subscriber changes the companding rule for each time zone, the trunk to be used changes. Therefore, it is necessary to provide a plurality of trunks in order to cover the trunk. However, there is a problem that the amount of hardware prepared in advance in the apparatus increases. That is, there is a problem that the amount of hardware increases in order to accommodate subscribers having different speeds in each system.

[0007] With the recent technological progress, the DSP (digital signal processor) has been advanced and downsized, and it has become possible to mount a speed conversion function when a mobile terminal is accommodated in a subscriber circuit. In this case, FIG.
The line-compatible speed converter having the configuration (a) can be loaded into the subscriber's circuit, and the line-compatible speed conversion can be realized at low cost. However, due to differences in traffic conditions such as daytime and nighttime, the rate conversion rule is changed in the subscriber circuit (for example, sub-rate data of 32 kb / s at night is converted into one at daytime).
When increasing the number of connectable subscribers between the subscriber and the 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 daytime
kb / s, 8 ch). For this reason,
The subscriber circuit has a maximum number of channels (for example, 8 channels in daytime).
The subscriber call highway between the subscriber's circuit and the concentrator switch must be configured so that the maximum number of channels for the line can be secured. Scale. Also, at present, this is a transitional period in which subscriber services shift from conventional analog telephones to digital terminals, and many subscribers will shift from analog telephones to digital terminals in the future. From a subscriber circuit for analog telephones (64 kb / s, 1 ch) to a subscriber circuit for basic digital terminals (64 kb / s, 2 ch)
When a certain subscriber is transferred, the number of channels handled by the subscriber circuit also changes from 1ch to 2ch. In this case, as in the case of the mobile subscriber accommodation described above, the subscriber circuit has a maximum number of channels. It is necessary to have a configuration in which a certain 2ch can be transmitted to the subscriber call highway in advance. As described above, in the subscriber line concentrator, a subscriber circuit such as a mobile base station in which the number of channels changes for each time zone, and a function corresponding to a change in the number of channels accompanying a change in the subscriber type from analog to digital are provided. The need increases. For this reason, if the maximum number of channels for each subscriber circuit is secured on the subscriber call highway between the subscriber circuit and the concentrator switch, the subscriber call highway becomes a large-scale one with high redundancy and The number of terminals accommodated in the digital switch also increases.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the use efficiency of a subscriber communication highway and increase the amount of hardware of a subscriber communication highway and a digital switch in an exchange accommodating a subscriber whose number of channels changes as described above. Suppress. Furthermore, it is possible to prevent the control processing from becoming complicated due to the concentration of variable channel subscribers. That is, an object of the present invention is to realize a line concentrating method for variable channel subscribers without complicating control from a control processing unit in a conventional exchange.

[0009]

In order to achieve the above object, in a subscriber line switching system comprising a subscriber circuit, a subscriber communication highway, and a subscriber line switch, a subscription through a subscriber's voice and data is made. A subscriber circuit capable of transmitting voice / data to a designated TS location on the subscriber call highway, and a function of constantly monitoring the usage status of the TS on the subscriber call highway, that is, a function on the subscriber call highway A function to monitor empty TS is provided, and based on the monitoring result,
By dynamically allocating the TS on the subscriber communication highway for each channel when the subscriber makes a call for each call, it is possible to effectively use the communication path highway.

[0010]

According to the present invention, an arbitrary empty TS can be allocated according to the state of a call at the time of calling, so that even if a plurality of subscribers having different numbers of channels call at an arbitrary timing, the TS on the subscriber communication highway can be allocated. Since a voice and data can be input after finding an empty space, the TS on the highway can be effectively used. In other words, in the subscriber line switching apparatus accommodating the subscriber circuits, the number of subscriber call highways can be reduced, and the call of each subscriber can be accommodated without performing the speed adjustment shown in the prior art. As described above, by absorbing the change in the number of channels of the subscriber by the communication path highway, it is possible to realize a minimum communication path highway and a flexible switch for subscriber line switching with a switch scale. Further, it is possible to easily cope with a change in the number of channels used in the subscriber circuit, as in the case where the subscriber shifts from analog to digital.

[0011]

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

FIG. 1 shows a basic configuration of a switching device communication path device. The communication path device includes a concentrator communication path 1 and a distribution communication path 2. Here, concentration line communication path 1
Is for converging traffic according to the call rate of the subscriber line, and is a part for realizing the variable channel subscriber concentrator system according to the present invention. The distribution stage communication path 2 is an exchange switch having a function of exchange-connecting the concentrator stage communication path 1 with the trunk line, the concentrator stage communication paths 1, and the trunk lines.

The subscriber concentrator exchange device corresponds to the concentrator communication line 1 of the exchange communication line device shown in FIG. 1, and includes a subscriber circuit 11, a subscriber communication highway 12, a concentrator switch 13, and a control unit. 14.

The subscriber circuit 11 has an analog (64 kb /
s × 1ch), basic digital (64 kb / s × 2c)
h), primary and higher level digital, mobile, leased line, AT
M is a circuit for accommodating subscribers with various channels used, such as M, and has a common interface (64 kb / s × n).
ch; n ≧ 1) and is connected to the subscriber call 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. In other words, the subscriber call highway 12 according to the present invention is used for the subscriber call highway 1 at every connection request of the subscriber or during connection (each call or during a call).
2 is a highway capable of assigning a variable TS, which can assign a subscriber's channel to an arbitrary TS on 2 and is realized by the operation described below.

First, in response to a connection request (call) from the subscriber circuit 11 (FIG. 1), the control unit 14 determines the subscriber number of the calling subscriber and the channel number of the connection request issued by the subscriber. (Because a subscriber has one or more channels,
At the time of calling, it is necessary to recognize the channel number of the connection request together with the subscriber number), and designate the TS position on the subscriber communication highway 12 which can be assigned to the subscriber to the subscriber circuit 11 (FIG. 1). . Next, the subscriber circuit 11 sends out voice / data to the designated TS (FIG. 1).

As described above, since the TS on the subscriber call highway is allocated for each channel that has been called, the subscriber call highway allows the subscribers to prepare without accommodating all the number of channels of each subscriber. Can accommodate.

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, various types of subscriber circuits having different numbers of channels to be used are used in the subscriber circuit. Type the accommodation position (ch
), Or by preparing the maximum number of channels of subscribers × TS for all subscribers. In comparison with this conventional method, according to the present invention, the subscriber call highway is not affected by the number of channels of each subscriber, so that the accommodation position of the subscriber circuit can be limited by the type (the number of channels). It is possible to accommodate various types of subscriber circuits having different numbers of channels to be used without preparing the maximum number of channels of the subscribers × TS for all the subscribers.

The TS on the subscriber call highway 12
Even though the number is constant, the TS can be effectively allocated only to the calling subscriber, so that the actual subscriber highway 1
The subscriber call highway 12 can be configured 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, concentrator communication path 1
Since the number of subscriber call highways 12 can be reduced as a whole, the scale of the concentrator switch 13 can be reduced.

Conventionally, when a certain subscriber makes a call / end (connection / release request), the subscriber number (including the channel number) and the highway number on the distribution stage side are designated in the concentrator communication line 1. By doing so, connection / disconnection to the distribution stage has been performed. However, according to the present invention, the configuration of the concentrator 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 channel number) on the distribution stage side, a new subscriber is added. Of TS on multi-user call highway 12 /
Control for performing release (TS allocation / transmission of release information) is required. Therefore, an embodiment in which the present control is easily performed without complicating the conventional exchange control will be described below.

The setting / release of the TS on the subscriber communication highway 12 is performed by switching software for managing the entire communication path apparatus (exchange of the entire switching apparatus communication path apparatus including the concentrator-stage communication path 1 and the distribution-stage communication path 2). There is a method determined by software to be controlled (not shown in FIG. 1)) and a method performed by the control unit 14 of the concentrator communication path 1.

In order to reduce the processing load of the exchange software, the method of setting / opening the TS on the subscriber call highway 12 by the exchange software is as follows: (1) The subscriber software highway is managed by the exchange software and the TS The setting and release are performed by the control unit 14, and (2) the subscriber communication highway is managed by the switching software and the TS is set. There is a method to do. In the method performed by the control unit 14, (3) the control unit 1
4 manages the subscriber call highway 12 and sets / releases a TS on the subscriber call highway 12. Hereinafter, means for implementing these methods will be described.

First, a description will be given of an embodiment of a method (1) for managing a subscriber call highway by using switching software and setting a TS, but releasing the TS by the control unit 14.

FIG. 3 is a block diagram showing an embodiment of a system in which the subscriber software highway is managed by the switching software and the TS is set, but the release is performed by the control unit 14. In response to the connection request from the subscriber circuit 11, the switching software determines the TS position on the subscriber call highway and notifies the control unit 14. The control unit 14 stores the number of the calling subscriber and the channel in the used TS holding memory 141 for holding the TS on the subscriber call highway used by the subscriber.
At the address of the number, the TS position on the subscriber call highway notified from the exchange software is written as data.
As a result, the TS position of the subscriber call highway used by the channel 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 call highway. The subscriber circuit sends data to the notified TS on the subscriber call highway. At the end of the call, the subscriber circuit notifies the control unit 14 of the release request (end call), the subscriber number and the channel number, and the control unit reads the contents of the subscriber number and the channel number of the used TS holding memory 141, As an open TS,
A notice is sent to the subscriber circuit (TS release position designation), and the subscriber circuit releases the used TS (use TS).

Next, the subscriber software highway is managed by the switching software, and the TS is set. To release the TS, the subscriber circuit detects the end of the call and opens the TS autonomously ((2) above). An example will be described.

FIG. 4 is a diagram for explaining an embodiment of a system in which the switching software manages the subscriber call highway and sets the TS, but releases the TS by the subscriber circuit detecting the end of the call and autonomously releasing the TS. It is. At the time of calling, the switching software determines the TS position on the subscriber communication highway and notifies the subscriber circuit according to the connection request from the subscriber circuit 11. The subscriber circuit sends voice and data to the notified TS on the subscriber call highway. Up to this point, the method is the same as the method of managing the subscriber call highway by using the switching software (1) and setting the TS, and the operation is the same as that of FIG. However, at the time of the 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 call highway.

Next, the control unit 14 manages the subscriber call highway 12, and the TS on the subscriber call highway 12 is controlled.
An embodiment of the method of setting / opening (3) above will be described.

FIG. 5 shows one embodiment of a subscriber call highway TS (hereinafter referred to as "HWTS") setting / opening system in which the control unit 14 sets a TS on the subscriber call path highway 12. FIG.
The setting / release circuit uses the number of the HWTS as an address, and a HWTS control memory 4 indicating the use state of each TS on the subscriber communication highway having the subscriber number and the channel number as data.
1 and the selection circuit 42 operating with the logic shown in FIG.
"Output of S control memory 41" and "Output B of selection circuit 42"
A counter 44 for sequentially counting up the address of the HWTS control memory 41, that is, the HWTS number, and an AND gate 45 receiving the output of the comparator 43 and the value of the counter 44 as inputs. , HW
Timing circuit 46 for delaying the output value of comparator 43 in order to create a timing for writing to TS control memory 41
It consists of.

In this configuration, when a subscriber having a certain number of channels makes a call, the subscriber circuit sets the HWTS for allocating the channel to which the subscriber wants to connect to the TS of the subscriber communication highway. The subscriber number and the channel number to be connected (subscriber number + the channel number to be connected are referred to as SL below)
No. 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 in accordance with the logic of FIG. From the HWTS control memory 41, at an appropriate cycle (for example, 16 ms which is a cycle of a scan circuit for detecting a call from a subscriber, and 125 μ which is a frame cycle of a subscriber communication highway)
s) The sequentially read outputs, ie, each T
The use state of S is compared with an empty pattern by the comparator 43.

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 outputs "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 to 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 subscriber data is designated
Put in TS, that is, set HWTS. Also,
At the same time, the output “1” of the comparator 43 is
, And becomes a write control signal for the HWTS control memory 41. At this time, what is input to the address of the HWTS control memory 41 is the counter value N at this time, and the data of the SLNo. S has been entered. As a result, the SLNo. To be connected to the address N of the HWTS control memory 41 is determined. S is to be written, and which channel of which subscriber is using the HWTS is to be written.

Conversely, when releasing the HWTS, the SLNo. S and HWTS release order selection circuit 42
To enter. According to the logic of FIG.
SLNo. Output S. On the other hand, the output (use state of each TS) sequentially read from the HWTS control memory 41 in the same manner as when the HWTS is set is output from the comparator 43 to the SLNo. Is compared to Here, at a certain counter value M, SLNo. If the S and the output of the HWTS control memory 41 match, that is, if the subscriber to be released and the channel number match the use subscriber of the TS held in the HWTS control memory and the channel number, the comparator 43 The output is "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 a write control signal of the HWTS control memory 41. At this time, HWTS
What is input to the address of the control memory 41 is the counter value M at this time, 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 to the address M of the HWTS control memory 41, indicating that the HWTS has become unused.

In this way, the SLN to be connected / released
o. , The control unit 14 can set / release the HWTS. The HWTS control memory 4
1 is repeatedly and sequentially read at an appropriate period. For this reason, when the calling state of the subscriber changes due to the passage of time, the used TS
Can be made empty. With this operation, even if the number of TSs on the subscriber call highway is constant, the TS can be effectively allocated only to the subscriber channel that is calling and talking, so that the subscriber call highway can be used effectively.
That is, it is possible to allocate channels of various subscribers having different numbers of channels to be used for each subscriber to appropriate TSs on the subscriber communication highway for each call, thereby facilitating accommodation of various subscribers. Further, for example, since the usage form differs for each time as in the case of a multimedia terminal, the usage c with the time c
It is possible to flexibly cope with accommodating subscribers whose h number changes.

FIG. 7 is a block diagram showing the configuration of an exchange communication path apparatus in a case where a base station of a mobile terminal is a subscriber and is terminated at a subscriber circuit such as a basic digital circuit. Mobile terminal 16
(Hereinafter referred to as PS) and a base station 15 (hereinafter referred to as BS), transmission is performed by a wireless line. Transmission between the BS 15 and the subscriber circuit 11 is performed at the basic digital line speed of 2B + D. To effectively use the line, the audio signal is compressed and the Bch is divided and used (eg, per Bch). Line speed 64
(Use kb / s at 32 kb / s x 2 ch.)
I do. The voice signal transmitted from the BS 15 is expanded to 64 kb / s, which is the minimum handling speed of the exchange, by a speed conversion circuit in the subscriber's circuit, and sent to the subscriber's communication highway. Between the BS 15 and the subscriber circuit 11, when the traffic volume is large, such as 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 conceivable to transmit more voice. This example will be described with reference to FIG. FIG. 7 (a) shows that one channel is 32 between the BS 15 and the subscriber circuit 11.
This shows a normal case where data is transmitted at a speed of kb / s. In this case, 4 channels can be transmitted per BS. Since the switching device exchanges a speed of 64 kb / s as a minimum handling unit, the speed conversion circuit 111 in the subscriber circuit 11 is used.
Performs a conversion of 32 kb / s → 64 kb / s, and sends it to the subscriber call highway 12. As a result, 64 kb / s × 4 ch is transmitted to the subscriber call highway. FIG. 7 (b) shows the case where BS1 is used in order to make effective use of a further line between the BS 15 and the subscriber's circuit 11 during the busiest time.
5 and the subscriber circuit 11 are transmitted at a rate of 8 kb / s per channel. In this case, 16c per BS
h can be transmitted. The speed conversion circuit 111 in the subscriber circuit 11 performs a conversion of 8 kb / s → 64 kb / s, and transmits the converted data to the subscriber communication highway 12. As a result, 64 kb / s × 16 ch is transmitted to the subscriber call highway during the busiest time.

As a result, the number of channels (the number of subscribers) that the BS can handle depends on the transmission speed during the day (most busy) and at night (during the night).
For example, by changing the companding rule when the traffic volume is different, it becomes possible to increase the number of channels that can be transmitted during the busiest. As described above, in the case of a switching device in which the base station of the mobile terminal is a subscriber and terminated in a subscriber circuit such as a basic digital circuit, the number of channels handled by the subscriber circuit may vary depending on the time zone. There is.

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

FIG. 8 is a flow chart showing the state of the change of the TS allocation from the connection request of the subscriber to the release according to the present invention when the number of channels handled by the subscriber circuit changes depending on the time zone. I do. The subscriber A is talking by connecting 1ch. At this time, TSn of the subscriber call highway is used (state). Next, the subscriber A terminates the call (ends the call).
Becomes empty (state). Thereafter, the subscriber B makes a call and uses the TSn of the subscriber communication highway (state). Thereafter, the subscriber A calls again. in this case,
Unlike the previous call, the subscriber A requests a service (multimedia service or the like) using 2ch. At this time, TSm and TSl of the subscriber call highway
To accommodate subscriber A.

The present method can be realized by firmware instead of the hardware shown in FIG. 5, and an example of a flowchart in that case is shown in FIGS. As in FIG. 5, the contents of the HWTS control memory 41 (vacant / use subscriber, ch) are constantly monitored, and the available TS of the subscriber call highway is monitored in accordance with the calling state of the subscriber.
The HWTS is set / released by allocating the channel to be used by the subscriber to.

When the HWTS is set / released by the control unit 14, the state of each TS of the HWTS is
Therefore, the control at the time of congestion needs to be performed by the control unit 14.

The control method at the time of congestion will be described with reference to FIGS.

FIG. 11 shows a BT (Busy To
FIG. 7B is a diagram illustrating a transmission method of ne), wherein when the control unit 14 detects congestion on the subscriber communication path highway 12, the control unit 14 transmits a BT to a newly called subscriber to notify that the line is blocked. Things. 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 the BT. (FIG. 11)
The BT can be sent to the subscriber.

FIGS. 12 and 13 are block diagrams showing an embodiment in which the congestion detecting circuit is realized by a hardware.

FIG. 12 shows a system 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, which are shown in the HWTS setting / release system shown in FIG. It is. In this configuration, when HWTS is set, SLNo. And the congestion monitoring bit "1" created by the congestion monitoring bit write selection circuit 47 is added to 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. And monitors for congestion. The control unit that detects the congestion notifies the switching software that manages the entire communication path of the congestion, and notifies the newly called subscriber circuit of the number of the TS from which the BT is transmitted. Notify. As a result, the BT is sent to the newly called subscriber, so that the subscriber can know that the subscriber is in a congested state. In this manner, the BT TS that has been distributed by the concentrator switch 13 can be easily distributed on the subscriber's communication path highway.

FIG. 13 shows a method of monitoring the presence or absence of an empty pattern during one cycle of the 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 for creating 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 the AND gate 49 are input to a clock terminal, and a flip-flop 50 whose data terminal is fixed to "0" is added. Thus, congestion detection is realized. Specifically, according to the logic of FIG.
The output B of the selection circuit 42 outputs an empty pattern except when the HWTS is released. As a result, the comparator 43
Except when the TS is released, the empty pattern is compared with the contents of the HWTS control memory.
"1" is output. Further, the output of the AND gate 49 takes in the input “0” of the flip-flop 50 with CLK on the condition that the output of the comparator 43 is “1” other than when the HWTS is opened, and outputs it to the output terminal. As a result, if the output of the flip-flop 50 is “0”, the empty HW
TS is present, that is, not in a congestion state. This is monitored for one cycle of the HWTS control memory read cycle. If the output of the flip-flop is "0", the flip-flop is set, the output is set to "1", and the monitoring state is set again. When this output becomes “1”, it is determined that congestion has occurred,
By notifying the switching software that manages the entire communication path of the congestion, and notifying the newly calling subscriber circuit of the number of the TS from which the BT is transmitted,
Sending a BT to the subscriber to notify the congestion state is the same as in FIG.

In the BT transmission method described above, new call subscribers are successively connected to the TS to which the BT is being transmitted at the time of congestion. Therefore, 1TS on the subscriber communication highway (that is, the BT is transmitted). TS) will be used by a plurality of subscribers. One of the subscriber calling highways
The present invention can also be applied to a broadcasting type service in which a TS is used by a plurality of subscribers. This embodiment will be described. FIG. 14 shows an embodiment in which a plurality of subscribers receive a common time signal notification service. Such services include, for example, weather forecast, traffic information, and the like. As in the case of the BT transmission method described above, this information can be easily realized simply by assigning such information to a specific TS instead of the BT.

In the case where a dedicated line is introduced into the subscriber line switching device which can freely allocate the subscriber's channel to the HWTS as described above, in order to prevent disconnection and instantaneous interruption of the dedicated line, Instead of setting / release for each call, a fixed TS is allocated, and a guard must be provided so that the HWTS is not released at the end of the call. Therefore, a specific embodiment of the HWTS protection method for a dedicated line when a dedicated line is introduced will be described with reference to FIGS. FIG.
5 is an HWT setup / release scheme shown in FIG.
An identification bit for identifying a dedicated line (fixed TS allocation) and a general subscriber (TS allocation for each call) is provided in the S control memory 41,
An AND gate 51 having fixed terminals of the output of the HWTS control memory 41 and the output of the comparator 43 as input terminals;
The protection of the HWTS for the dedicated line is realized by adding a fixed bit (identification bit) of the output of the HWTS control memory 41 to the input terminal of the AND gate 45. The operation will be described below.

Normally, when the HWTS is released, the SL to be released
No. Is compared with the output of the HWTS control memory 41. If the contents match, the output of the comparator 43 becomes "1",
HWTS is released. However, at this time, if the output of the fixed bit is “0” meaning that the dedicated line is accommodated, 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. For this reason, those in which “0” is written in the fixed bit are not output as the open HWTS, and
Rewriting of the TS control memory 41 is protected. That is,
There is no disconnection of the dedicated line or instantaneous interruption due to TS position change.

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 a general subscriber, the output B of the selection circuit 42 sends an empty pattern according to the logic of FIG. A recognition bit “1” is added to the input and input to the comparator 43. On the other hand, in the present configuration, since the identification bit “1” is also added to the empty pattern of the output of the HWTS control memory 41, when it matches the empty pattern, the same as in the above-described HWTS setting / opening operation. HWTS settings can be made. However, even if an attempt is made to release the HWTS in which the dedicated line is accommodated, the protection is performed in the following manner. That is, when it is desired to release a certain subscriber, the selection circuit 42 according to the logic of FIG.
Output B of SLNo. Is sent. Even if “1” meaning an ordinary subscriber is added to the input to the comparator 43 and the SLNo. Of the output of the HWTS control memory 41 is added.
When the dedicated line is accommodated and protected, the identification bit is “0” meaning that the dedicated line is accommodated. HW
The comparator 43 in the TS control memory 41 has different fixed bits and does not output a match between the contents. That is, since the AND gate 45 does not operate, the HWTS is not released,
No rewriting of the HWTS control memory is performed. That is, similar to the operation of the configuration shown in FIG. 15, it is possible to protect a specific subscriber (a dedicated line or the like).

The means for realizing various services, such as congestion control, has been described above with reference to FIGS. 11 to 16 in terms of the hardware operation centering on the operation of the HWTS control memory 41 shown in FIG. Obviously, the -service can be realized by firmware, like the hardware realization method of FIG. 5 can be realized by the firmware shown in FIGS.

[0049]

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

FIG. 17 shows an example of a comparison between the fixed TS allocation method and the method of the present invention. FIG. 17 shows a subscriber line switching apparatus 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 subscribers / all subscribers) is “0”, "
It shows the relationship between the call rate when the number changes to 0.1 "and" 0.3 "and the required number of subscriber high-availability TSs.
As can be seen from FIG. 17, in the variable TS allocation method, the number of TSs required for the subscriber call hi-way decreases as the call rate decreases, and the subscriber concentrator communication path device is constructed with a configuration smaller than the fixed TS allocation method. it can.

The other effects are listed below.

(1) The number of channels handled by the subscriber's circuit changes depending on the time zone, such as in a switching line device when the base station of the mobile terminal is a subscriber and terminated at the subscriber's circuit such as a basic digital circuit. Even if there is a possibility that it will be used, it can be used by allocating it to an appropriate TS on the subscriber call 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 configured with a smaller number of TSs than before. Thus, the subscriber call highway can be effectively used.

(3) As described above, it is possible to reduce the subscriber communication highway, and it is also possible to reduce the size of the concentration switch.

(4) As described above, the configuration of the concentrator communication path can be significantly simplified.

(5) By allocating the TS on the subscriber call highway by the control unit, the conventional exchange control is not complicated.

(6) The congestion on the subscriber communication highway can also be monitored by the control unit, and the subscriber can easily be notified of the congestion by transmitting the BT.

(7) The BT transmission method can be applied to a broadcasting service.

(8) By providing a protection function for the dedicated line, disconnection or instantaneous interruption of the dedicated line does not occur.

[0060]

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a conventional system.

FIG. 3 is a diagram showing one embodiment of a system in which setting of a subscriber call highway TS is performed by switching software and release is performed by a control unit;

FIG. 4 shows a system 1 in which the setting of a subscriber communication highway TS is performed by switching software, and the release is automatically performed by a subscriber circuit.
The figure which showed the Example.

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

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

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

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

FIG. 10 is an explanatory diagram showing a processing example (2) in a case where HWTS setting / release is performed by firmware.

FIG. 11 is a diagram showing control at the time of 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 where a plurality of subscribers receive a common time signal notification service.

FIG. 15 is a block 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: Concentrator communication line 2: Distribution stage communication channel 11: Subscriber circuit 12: Subscriber communication highway 13: Concentrator switch 14: Control unit 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 monitoring bit write selection circuit 48: congestion monitoring circuit 49: AND gate 50: flip-flop 51: AND gate 141: used TS holding memory

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-184133 (JP, A) JP-A-62-230198 (JP, A) JP-A-4-23694 (JP, A) JP-A 62-230 230136 (JP, A) JP-A-56-132093 (JP, A) JP-A-63-237690 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04Q 11/04 H04Q 3 / 42 104 H04Q 3/52 101 H04Q 3/60

Claims (8)

(57) [Claims] 1. The basis of one service allocation of one subscriber.
When this unit is one channel (hereinafter referred to as ch), additional
Accommodates various subscriber circuits that use different numbers of channels for each subscriber
In a subscriber line exchange, use of the subscriber for each call c
h is any time slot on the subscriber calling highway
(Hereinafter referred to as TS)
Subscriber highway and concentrator switch that can be assigned to
And the vacant pattern indicating that the TS is not used and the subscriber of the subscriber.
Selection means for selecting a number and a channel number in accordance with the state of the call
And the location of the TS on the subscriber call highway
HWTS control memory having output of the selecting means as data
And an address for giving an address to the HETS control memory.
Source generating means, the output of the HWTS control memory and the selection.
Comparing means for comparing the outputs of the selecting means, and the comparing means
When a match of the comparison result is detected, the address generation means
Output means for outputting the output of the terminal to the subscriber circuit and said selection means
HWTS for writing the output of HWTS to the HWTS control memory
Control memory write timing control means and subscriber call
Any TS on the subscriber calling highway corresponding to the state of
Call highway to dynamically set or release
TS setting / opening position determination means (hereinafter HWTS setting / opening)
A) that the position determining means, said HWTS set / release position determination means, the selection means inputs the subscriber number and the ch number of the subscriber to the HWTS control memory during HWTS setting, also, the comparison means free pattern And the comparing means outputs the HWTS
When detecting that the output of the control memory is a free pattern, the output of the address generation means is output to the subscriber circuit, while the subscriber number and the channel number are written in the HWTS control memory. Means for inputting the empty pattern into the HWTS control memory, and inputting the subscriber number and the channel number of the subscriber to the comparing means, wherein the output of the HWTS control memory is the subscriber number of the subscriber. A switching device for a subscriber concentrator, characterized in that when detecting that it is a channel number call, the output of the address generation means is output to the subscriber circuit, and an empty pattern is written in the HWTS control memory. 2. The basis of one service allocation of one subscriber.
When this unit is one channel (hereinafter referred to as ch), additional
Accommodates various subscriber circuits that use different numbers of channels for each subscriber
In a subscriber line exchange, use of the subscriber for each call c
h is any time slot on the subscriber calling highway
(Hereinafter referred to as TS)
Subscriber highway and concentrator switch that can be assigned to
And the vacant pattern indicating that the TS is not used and the subscriber of the subscriber.
Selection means for selecting a number and a channel number in accordance with the state of the call
And the location of the TS on the subscriber call highway
HWTS control memory having output of the selecting means as data
And an address for giving an address to the HETS control memory.
Source generating means, the output of the HWTS control memory and the selection.
Comparing means for comparing the outputs of the selecting means, and the comparing means
When a match of the comparison result is detected, the address generation means
Output means for outputting the output of the terminal to the subscriber circuit and said selection means
HWTS for writing the output of HWTS to the HWTS control memory
Control memory write timing control means and subscriber call
Any TS on the subscriber calling highway corresponding to the state of
Call highway to dynamically set or release
TS setting / opening position determination means (hereinafter HWTS setting / opening)
A) that the position determining means, said HWTS setting / releasing position determining means, said HWTS
The congestion monitoring bit is added to the control memory, said HWTS subscriber concentrator replacement apparatus comprises carrying out the congestion monitoring controlled by the output of the control memory by providing the congestion monitoring unit. 3. The basis of one service assignment of one subscriber.
When this unit is one channel (hereinafter referred to as ch), additional
Accommodates various subscriber circuits that use different numbers of channels for each subscriber
In a subscriber line exchange, use of the subscriber for each call c
h is any time slot on the subscriber calling highway
(Hereinafter referred to as TS)
Subscriber highway and concentrator switch that can be assigned to
And the vacant pattern indicating that the TS is not used and the subscriber of the subscriber.
Selection means for selecting a number and a channel number in accordance with the state of the call
If, as the address of the TS location of the subscriber call highway
HWTS control memory having output of the selecting means as data
And an address for giving an address to the HETS control memory.
Source generating means, the output of the HWTS control memory and the selection.
Comparing means for comparing the outputs of the selecting means, and the comparing means
When a match of the comparison result is detected, the address generation means
Output means for outputting the output of the terminal to the subscriber circuit and said selection means
HWTS for writing the output of HWTS to the HWTS control memory
Control memory write timing control means and subscriber call
Any TS on the subscriber calling highway corresponding to the state of
Call highway to dynamically set or release
TS setting / opening position determination means (hereinafter HWTS setting / opening)
A) that the position determining means, said HWTS setting / releasing position determining means, said HWTS
A switching device for a subscriber concentrator, comprising a detecting means for detecting the presence or absence of an empty pattern in a control memory, detecting congestion, and performing congestion monitoring control. 4. The basis of one service assignment of one subscriber.
When this unit is one channel (hereinafter referred to as ch), additional
Accommodates various subscriber circuits that use different numbers of channels for each subscriber
In a subscriber line exchange, use of the subscriber for each call c
h is any time slot on the subscriber calling highway
(Hereinafter referred to as TS)
Subscriber highway and concentrator switch that can be assigned to
And the vacant pattern indicating that the TS is not used and the subscriber of the subscriber.
Selection means for selecting a number and a channel number in accordance with the state of the call
And the location of the TS on the subscriber call highway
HWTS control memory having output of the selecting means as data
And an address for giving an address to the HETS control memory.
Source generating means, the output of the HWTS control memory and the selection.
Comparing means for comparing the outputs of the selecting means, and the comparing means
When a match of the comparison result is detected, the address generation means
Output means for outputting the output of the terminal to the subscriber circuit and said selection means
HWTS for writing the output of HWTS to the HWTS control memory
Control memory write timing control means and subscriber call
Any TS on the subscriber calling highway corresponding to the state of
Call highway to dynamically set or release
TS setting / opening position determination means (hereinafter HWTS setting / opening)
A) that the position determining means, said HWTS set / release position determination means, all of the use ch subscriber or to provide a service to always connect the part, the part of the TS on call highway on which a fixed allocation, further general any TS on subscriber status subscriber call highway in response to the call so as to be able to set or open dynamically, before
Subscribers who can freely assign the channels used by the subscribers
A subscriber line switching device, wherein a dedicated line is introduced into a line switching device, and HWTS protection means for the dedicated line is provided. 5. The fixed line according to claim 4, wherein
The HWTS protection means has a fixed bit in the HWTS control memory, and has a call highway TS setting / release position determination means for performing write protection by using this bit. 6. The basis of one service allocation of one subscriber.
When this unit is one channel (hereinafter referred to as ch), additional
Accommodates various subscriber circuits that use different numbers of channels for each subscriber
In a subscriber line exchange, use of the subscriber for each call c
h is any time slot on the subscriber calling highway
(Hereinafter referred to as TS)
Subscriber highway and concentrator switch that can be assigned to
And the vacant pattern indicating that the TS is not used and the subscriber of the subscriber.
Selection means for selecting a number and a channel number in accordance with the state of the call
And the location of the TS on the subscriber call highway
HWTS control memory having output of the selecting means as data
And an address for giving an address to the HETS control memory.
Source generating means, the output of the HWTS control memory and the selection.
Comparing means for comparing the outputs of the selecting means, and the comparing means
When a match of the comparison result is detected, the address generation means
Output means for outputting the output of the terminal to the subscriber circuit and said selection means
HWTS for writing the output of HWTS to the HWTS control memory
Control memory write timing control means and subscriber call
Any TS on the subscriber calling highway corresponding to the state of
Call highway to dynamically set or release
TS setting / opening position determination means (hereinafter HWTS setting / opening)
A) that the position determining means, said HWTS control memory in the address subscriber numbers and ch number has the TS position call highway data,
Setting the call highway TS to perform an autonomous release operation by outputting data of the call highway TS to be released by giving the subscriber number and the channel number to be released to the address /
An exchange device for subscriber concentrators, comprising an open position determining means. 7. A system in which a plurality of sub-channels lower than the basic speed are provided in a basic channel for communication with a subscriber terminal, and converted into the basic speed in an NW for communication, the speed change or companding is performed. When the rule conversion is performed in the subscriber circuit unit and the basic unit of one service allocation of one subscriber is one channel (hereinafter referred to as "ch"), various subscriber circuits which use different numbers of channels for each subscriber are accommodated. In a subscriber line exchange, a subscriber communication highway capable of dynamically assigning a use channel of the subscriber to an arbitrary time slot (hereinafter, referred to as TS) on the subscriber communication highway for each call in accordance with a call state. And a subscriber concentrator having a concentrator switch, or an exchange comprising a combination of one or more of the claims 1-6 . 8. The subscriber circuit according to claim 12, wherein the mobile base station is accommodated as a subscriber, and a plurality of channels whose bandwidths are compressed are communicated between the base station and the exchange using sub-channels. , Each of which has a reference signal speed and a conversion function in the exchange, and when the basic unit of one service assignment of one subscriber is one channel (hereinafter referred to as "ch"), various subscribers who use different numbers of channels for each subscriber. In a subscriber line exchange accommodating a circuit, a channel used by the subscriber is changed to an arbitrary time slot (hereinafter, TS) on a subscriber communication highway for each call.
A subscriber line switching device having a subscriber telephone highway and a line switch capable of being dynamically allocated according to the state of a call, or one or an arbitrary number of claims from claims 1 to 6 ; An exchange device that is a combination of