JP3175708B2 - Multiplexer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-demand system which accommodates a voice communication line and a frame relay line and allocates a communication band preferentially to communication by the voice communication line when a connection request is made from the voice communication line. The present invention relates to a system multiplexing device.

[0002]

2. Description of the Related Art Conventionally, PBX (Private Branch eXc
hange; a private branch exchange) and a frame relay line, and an on-demand system configured to preferentially allocate a band to voice data communication when a voice data communication request is made via the PBX. There is a multiplexing device.

FIG. 7 shows a schematic configuration of such a conventional multiplexer. This device is disclosed in JP-A-9-27793.

In the multiplexing apparatus 100, a signal input from a signal line 103 for receiving a signal from another terminal device and a signal line 104 for receiving a signal in a voice band are transmitted to the switch 10
2 is input. The control unit 101 includes a terminal system signal line 103
Of the signals input from the switch 102, the signal whose delay is not allowed and the signal of the audio band received via the signal line 104 are immediately transmitted from the switch 102 to the time division multiplex processing unit 106 via the signal line 105. Time division multiplex processing unit 1
At 06, the signal via the signal line 10 is allocated to the time slot of the demand band and transmitted. On the other hand, of the signals from the terminal system signal line 103, those for which delay is allowed are:
After the data is temporarily stored in the buffer memory 107, when a time band is generated in the demand band in the time division multiplex processing unit 106, it is transmitted to the time division multiplex processing unit 106 via the signal line 108.
The time-division multiplexing unit 106 allocates the signal received via the signal line 108 to a time slot of a demand band and transmits the signal.

[0005] As described above, the conventional on-demand type multiplexing apparatus has a buffer memory, and when a line is congested, data that does not need to be transmitted immediately is temporarily stored in the buffer memory, and then the line is stored in the buffer memory. Was trying to communicate when it was free. Conventionally, in a time-division multiplexing apparatus accommodating a line connecting a voice communication terminal and a frame relay terminal, communication by the voice communication terminal is highly necessary,
Band allocation to a frame relay terminal is increased or decreased according to the state of a connection request from a voice communication terminal.

FIG. 8 shows an example of such a time division multiplexer. In the time-division multiplexing apparatus 201, the bandwidth allocation control unit 202 monitors the status of a connection request from each voice communication terminal (not shown) connected via the line 203, and responds to the status of the connection request. , Band switching control unit 20
4 is controlled so as to increase or decrease the allocation of the communication band to the frame relay line 206 by the transmission path 205.

[0007]

As described above, conventionally, a time-division multiplexing apparatus accommodating a line connecting a voice communication terminal and a frame relay terminal, according to the status of a connection request from the voice communication terminal. A technique for variably controlling the allocation of a band to a frame relay terminal has been proposed.
However, according to the above-described conventional technology, when the connection request from the voice communication terminal increases, the bandwidth allocation to the frame relay terminal is always suppressed. When there are many connection requests from the terminal, there is an inconvenience that priority communication is not executed.

An object of the present invention is to provide an on-demand system in which a voice communication line and a frame relay line are accommodated, and when a connection request is made from the voice communication line, a communication band is preferentially allocated to communication by the voice communication line. It is an object of the present invention to provide a multiplexing apparatus which can preferentially allocate a communication band to communication via a frame relay line without deteriorating data transmission efficiency of the entire system.

[0009]

According to the first aspect of the present invention, (a) multiplexing of data inputted through a plurality of lines including a line for communicating voice data and transmission through a transmission line. And (b) setting, in accordance with a time zone, a band for preferentially transmitting audio data input via a line for communicating audio data among bands for transmitting data via the transmission path . 1 setting means and (c) multiple times
Data from a line other than the line that communicates the voice data in the line
The setting by the first setting means according to the input status of the data
The multiplexing device is provided with a second setting means for setting a time zone to be invalidated .

[0010]

[0011]

Namely, in the first aspect of the present invention, the data inputted through the plurality of lines including the lines that communicate voice data multiplexing, of the transmission band, the band for transmitting voice data preferentially Is set according to the time zone. However, the setting of the above-mentioned band is invalidated in a time zone in which communication via a line other than the line for communicating voice data should be given priority. As a result, the communication of voice data is not prioritized in a time zone in which communication by a line other than the line for transmitting voice data is necessary, so that the voice data can be appropriately transmitted according to the actual use condition of the multiplexer. A priority transmission band can be set.

According to the second aspect of the present invention, (a) multiplexing means for multiplexing data inputted through a plurality of lines including a line for communicating voice data and transmitting the multiplexed data through a transmission line; Voice communication band setting means for setting, in accordance with a time zone, a band for preferentially transmitting voice data input via a line for transmitting voice data among bands for transmitting data via a transmission path; (C) congestion state determination means for determining whether or not the input state of data input from a line other than a line for communicating voice data among a plurality of lines is a congestion state; and (d) voice communication band setting means. Voice priority setting release means for setting a time period during which the setting can be released,
(E) During the time period set by the voice priority setting canceling means, when the congestion state determining means determines that the data input state is the congestion state, the band set by the voice communication band setting means is set to a predetermined value. A congestion-time band setting means for setting a low-level band is provided in the multiplexer.

That is, according to the second aspect of the present invention, data input through a plurality of lines including a line for communicating voice data is multiplexed, and out of a transmission band, the data is multiplexed via a line for communicating voice data. A band for preferentially transmitting input voice data is set according to a time zone, and it is determined whether or not an input state of data input from a line other than a line for communicating voice data is a congestion state, A time zone is set in which the setting of the band for transmitting audio data with priority can be canceled. In the set releasable time zone, when it is determined that the input state of the data input from the line other than the line for communicating the voice data is the congestion state, the band for preferentially transmitting the voice data is set to the predetermined value. Is set to a low level band. As a result, in principle, voice data communication is performed with priority, and voice data communication is increased in a time zone in which communication via a line other than the line through which voice data is to be prioritized, and voice data is communicated. When communication by a line other than the line becomes congested, a band in which communication of voice data is prioritized is set to a predetermined low-level band. Therefore, in a time zone where priority should be given to communication by a line other than the line for communicating voice data, communication of voice data can be suppressed, and priority can be given to communication by a line other than the line for communicating voice data.

According to the third aspect of the present invention, (a) multiplexing means for multiplexing data input via a plurality of lines including a line for communicating voice data and transmitting the multiplexed data via a transmission line; Voice communication band setting means for setting, in accordance with a time zone, a band for preferentially transmitting voice data input via a line for transmitting voice data among bands for transmitting data via a transmission path; (C) Out of multiple lines
A buffer means for temporarily storing data from the line other than the line for communicating voice data, and (d) the accumulated data amount monitoring means for monitoring the data quantity stored in the buffer means, (e) the accumulated based on the amount of data to be monitored by the data amount monitoring unit, the congestion status determining means for determining the input state of the data whether or not the congestion state of the line other than the line for communicating voice data, (f) voice A voice priority setting release means for setting a time zone in which the setting by the communication band setting means can be released; and (g) a data input state by the congestion state determination means in a time zone set by the voice priority setting release means. And the congestion-time band setting means for setting the band set by the voice communication band setting means to a predetermined low-level band when it is determined that

That is, according to the third aspect of the present invention, of the band for transmitting data input through a plurality of lines including a line for communicating voice data, the data is input via a line for communicating voice data. A band for preferentially transmitting audio data is set according to a time zone. Among a plurality of lines, a buffer unit for temporarily storing data from a line other than a line for communicating voice data is provided, and an amount of data stored in the buffer unit is monitored.
Based on the monitored data amount, it is determined whether or not the input state of data from a line other than the line for communicating voice data is a congestion state. On the other hand, when a time period in which the setting of giving priority to the transmission of voice data can be canceled is set, and during this time period, it is determined that the input state of data from a line other than the line that communicates the voice data is in a congestion state Then, the band for transmitting the audio data with priority is set to a predetermined low-level band. As a result, in principle, voice data communication is performed with priority, and voice data communication is increased in a time zone in which communication via a line other than the line through which voice data is to be prioritized, and voice data is communicated. When communication by a line other than the line becomes congested, a band in which communication of voice data is prioritized is set to a predetermined low-level band. Therefore, in a time zone where priority should be given to communication by a line other than the line for communicating voice data, communication of voice data can be suppressed, and priority can be given to communication by a line other than the line for communicating voice data.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments.

FIG. 1 is a block diagram showing a schematic configuration of a multiplexer according to an embodiment of the present invention. This multiplexing device 1
Reference numeral 0 indicates that a plurality of voice communication terminals 12 such as telephones are connected via a private branch exchange (PBX) 11 and a plurality of terminal devices 13 are connected via a frame relay line 23. That is, PBX
11 is connected to the voice call control unit 15 of the voice accommodating unit 14, and the frame relay line 23 is connected to the buffer control unit 18 of the frame relay accommodating unit 17 via the frame relay buffer 16.

The voice call control unit 15 transmits a call connection request signal to the demand control unit 20 of the demultiplexing function unit 19 in response to a call signal from each voice terminal 12 via the PBX 11. In response to a call connection request from the voice call control unit 15, the demand control unit 20 multiplexes voice data input via the PBX 11 within the range of a maximum assignment band described later and transmits the multiplexed voice data via the transmission path 24. Perform control. The setting information processing unit 21 stores a setting value registration time table to be described later.
Set the maximum assignment band. The setting information processing unit 2
1 is connected to a buffer monitoring unit 22. The buffer monitoring unit 22 monitors the amount of data stored in the frame relay buffer 16 at regular intervals via the buffer control unit 18 that controls the storage operation of the frame relay buffer 16, and obtains a frame obtained by the monitoring. The setting information processing unit 21 is notified of information on the usage rate R of the relay buffer 16.

FIG. 2 is a diagram showing a setting example of the above-mentioned setting value registration time table stored in the setting information processing section. The setting of the set value registration time table is performed by inputting a predetermined command through a terminal device (not shown) connected to the multiplexer 10.

As shown in the figure, the set value registration time table divides from 0:00 to 24:00 every hour.
Two types of information, item A and item B, are set for each time. That is, as item A, of the communication band via the transmission line 24, the maximum value of a band for transmitting voice data preferentially in response to a call connection request from the voice call control unit 15 (hereinafter, referred to as a maximum assignment band). Is set. As item B, information indicating whether the frame relay traffic priority mode for giving priority to the transmission of data input via the frame relay line 23 is valid or invalid regardless of the setting of the maximum assignment band.

FIG. 3 shows a main routine of a process for allocating a communication band to each of the PBX and the frame relay line according to the setting in the set value registration time table. This process is repeatedly executed at predetermined time intervals under the control of the demand control unit 20.

First, the setting information processing unit 21 reads information indicating the maximum assignable band at the time from the set value registration time table (step S11), and also reads information indicating whether the frame relay traffic priority mode is valid or invalid. (Step S12). The read information is temporarily stored in a predetermined parameter storage unit of the setting information processing unit 21.

Next, the demand control unit 20 determines whether the frame relay traffic priority mode is valid or invalid with reference to the information stored in the parameter storage unit of the setting information processing unit 21 (step S13). As a result, if the frame relay traffic priority mode is invalid (Step S13; No), the maximum assignment band is set based on the information read in Step S11.

If the frame relay traffic priority mode is valid (step S13; Yes), it is determined whether or not the input state of data via the frame relay line 23 is a congestion state by a process described later (step S13). S14). Here, if it is determined that the state is not the congestion state (step S14; No), the frame relay circuit 23
Assuming that the necessity of communication via is not great, based on the information read in step S11,
The maximum assignment band is set (step S15). If the frame relay traffic priority mode is valid and the frame relay band is in a congestion state (step S14; Yes), the process proceeds to a congestion state setting process described later.

FIG. 4 is a flowchart showing a process in which the demand control unit 20 allocates a communication band to voice data in response to a call connection request from the voice call control unit 15.

First, when the demand control unit 20 receives a new call connection request from the voice call control unit 15, the demand control unit 20 checks the maximum assignable bandwidth at the time (step S2).
1). Then, when a priority transmission band for transmitting voice data preferentially is assigned to a communication band via the transmission path 23 in response to a new call connection request, the priority transmission band of the voice data is set to be equal to or less than the maximum assignment band at the time. Is determined (step S22). Here, if the bandwidth is equal to or less than the maximum assignment bandwidth (step S22; Yes), a priority transmission bandwidth for voice data is allocated to a communication bandwidth via the transmission path 23 in response to the call connection request. On the other hand, when the priority transmission band of the voice data exceeds the maximum assignment band due to the new assignment (step S22; No), this processing is performed without allocating a new priority transmission band of the voice data in response to the call connection request. finish. Here, when the priority transmission band is not allocated to the call connection request from the voice call control unit, that is, when the connection of the line is rejected, the multiplexing device 10
Is considered to be busy.

The congestion state setting process in step S16 is executed in the following procedure.

FIG. 5 is a flowchart outlining the congestion state setting process. This process is executed under the control of the demand control unit 20 at predetermined time intervals.

First, the setting information processing unit 21 transmits the frame relay buffer 1 monitored by the buffer monitoring unit 22.
6 is confirmed (Step S31). Accordingly, the setting information processing unit 21 estimates traffic via the frame relay 23.

FIG. 6 is a diagram for explaining a method of determining whether or not communication via the frame relay is in a congestion state based on the usage rate R of the frame relay buffer. The bar graph in the figure shows the usage rate R of the frame relay buffer 16. In addition, points P and Q indicate first and second reference values (P <Q) for determining whether or not traffic with the frame relay terminal is in a congested state, respectively.

That is, the setting information processing section 21 determines that the congestion has occurred when the usage rate R of the frame relay buffer 16 exceeds the second reference value Q. Then, when it is determined that the congestion state has once been reached, it is determined that the congestion state continues until the usage rate R falls below the first reference value P.

Referring back to FIG. 5, the setting information processing section 21 determines whether or not the usage rate R of the frame relay buffer 16 is equal to or greater than the first reference value P (step S32). "R <
If “P”, it is determined that the apparatus is not in the congestion state, and the process is immediately terminated. If “R ≧ P”, the congestion state indicated by “1” in the previous routine is determined to be the congestion state. It is determined whether or not the state determination flag FCG is “0” (step S33). If “FCG = 0” (step S33; Yes), it is determined that the congestion state is not set in the previous routine, and whether the usage rate R of the frame relay buffer 16 is equal to or more than the second reference value Q. It is determined whether or not it is (step S34). If "R <Q" (step S34; No), the processing is immediately terminated assuming that the state is not congested, while if "R≥Q" (step S34; Yes), the state is now congested. Judge things.

As described above, when it is determined that the congestion state has occurred this time, it is further determined whether the frame relay traffic priority mode is valid (step S3).
5). If the frame relay traffic priority mode is valid (step S35; Yes), the maximum assigned bandwidth is changed to a predetermined low-level bandwidth during congestion (step S35).
36), the congestion state determination flag FCG is set to “1” (step S37). If the frame relay traffic priority mode is invalid (step S35; No), the congestion state determination flag FCG is set to "1" without changing the maximum assigned bandwidth (step S37), and the process ends.

When the usage rate R is smaller than the first reference value P (step S32; No), it is determined whether or not the congestion state determination flag FCG is "1". It is determined whether or not it is determined that there is (Step S38). If “FCG = 1” is not satisfied (Step S38; No), this processing is immediately terminated. Also, "F
If CG = 1 "(Step S; Yes), it is determined whether the frame relay traffic priority mode is valid or invalid (Step S39). Here, if the frame relay traffic priority mode is valid (Step S39) (Step S39; Yes), the maximum assigned band changed in the previous routine is restored (Step S40), the congestion state determination flag FCG is set to "1" (Step S41), and the process is terminated. .

[0036]

As described in the foregoing, according to the first aspect of the invention, the data inputted through the plurality of lines including the lines that communicate voice data multiplexing, of the transmission band, the audio Although the band for transmitting data preferentially is set according to time zone, setting the band in a time zone to be prioritized communication by line other than the line to communicate voice data
Is invalidated. This allows the line to communicate audio data
During times when there is an urgent need for communication via other lines, voice
Since data communication is not prioritized, the priority transmission band for audio data can be appropriately set according to the actual use status of the multiplexer.

[0037]

According to the second aspect of the present invention, data input through a plurality of lines including a line for communicating voice data is multiplexed, and out of a band to be transmitted, the data is transmitted via a line for communicating voice data. A band for preferentially transmitting input voice data is set according to a time zone, and it is determined whether or not an input state of data input from a line other than a line for communicating voice data is a congestion state, A time zone is set in which the setting of the band for transmitting audio data with priority can be canceled. In the set releasable time zone, when it is determined that the input state of the data input from the line other than the line for communicating the voice data is the congestion state, the band for preferentially transmitting the voice data is set to the predetermined value. Is set to a low level band. As a result, in principle, voice data communication is performed with priority, and voice data communication is increased in a time zone in which communication via a line other than the line through which voice data is to be prioritized, and voice data is communicated. When communication by a line other than the line becomes congested, a band in which communication of voice data is prioritized is set to a predetermined low-level band. Therefore, in a time zone where priority should be given to communication by a line other than the line for communicating voice data, communication of voice data can be suppressed, and priority can be given to communication by a line other than the line for communicating voice data.

According to the third aspect of the present invention, of a band for transmitting data input through a plurality of lines including a line for communicating voice data, the data is input via a line for communicating voice data. A band for preferentially transmitting audio data is set according to a time zone. A buffer unit for temporarily storing data from a line other than a line for communicating audio data among a plurality of lines is provided, and an amount of data stored in the buffer unit is monitored, and the monitored amount is monitored. Based on the data amount, it is determined whether the input state of data from a line other than the line for communicating voice data is a congestion state. On the other hand, when a time period in which the setting of giving priority to the transmission of voice data can be canceled is set, and during this time period, it is determined that the input state of data from a line other than the line that communicates the voice data is in a congestion state Then, the band for transmitting the audio data with priority is set to a predetermined low-level band. As a result, in principle, voice data communication is performed with priority, and voice data communication is increased in a time zone in which communication via a line other than the line through which voice data is to be prioritized, and voice data is communicated. When communication by a line other than the line becomes congested, a band in which communication of voice data is prioritized is set to a predetermined low-level band.
Therefore, in a time zone where priority should be given to communication by a line other than the line for communicating voice data, communication of voice data can be suppressed, and priority can be given to communication by a line other than the line for communicating voice data.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of a multiplexer according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of a set value registration time table according to the present embodiment.

FIG. 3 is a flowchart illustrating a main routine of a process executed by a demand control unit according to the embodiment;

FIG. 4 is a flowchart of a process of preferentially allocating a band to voice communication.

FIG. 5 is a flowchart of a process for determining whether a frame relay line is in a congestion state.

FIG. 6 is a diagram illustrating a usage rate of a frame buffer.

FIG. 7 is a block diagram showing a schematic configuration of a conventional multiplexer.

FIG. 8 is a block diagram showing a schematic configuration of a conventional multiplexer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Multiplexer 11 PBX 14 Voice accommodating part 16 Frame relay buffer 20 Demand control part 22 Buffer monitoring part 23 Frame relay line

Continuation of front page (56) References JP 9-27793 (JP, A) JP 5-75617 (JP, A) JP 5-327641 (JP, A) JP 2000-49820 (JP, A) A) JP-A-10-93523 (JP, A) JP-A-9-93268 (JP, A) JP-A-1-144829 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04J 3/00-3/26 H04L 12/00-12/66

Claims (3)

(57) [Claims] 1. A multiplexing means for multiplexing data input via a plurality of lines including a line for communicating voice data and transmitting the multiplexed data via a transmission line, and a band for transmitting data via the transmission line. of, the set according to the band of transmitting the voice data input via a line communicating the voice data preferentially to the time zone
And a setting means other than a line for communicating voice data among the plurality of lines.
The first setting according to the data input status from the line
The second setting for setting a time zone in which the setting by means is invalidated
Multiplexing apparatus characterized by comprising a constant section. 2. A multiplexing means for multiplexing data input via a plurality of lines including a line for communicating voice data and transmitting the multiplexed data via a transmission line, and a band for transmitting data via the transmission line. A sound for setting a band for preferentially transmitting audio data input through a line for communicating the audio data in accordance with a time zone
Voice communication band setting means, and whether an input state of data input from a line other than a line for communicating voice data among the plurality of lines is a congestion state or not.
Congestion state determination means for determining the time when the setting by the voice communication band setting means can be released
A voice priority setting cancellation unit for setting a band, in the time zone set by the speech priority setting cancellation unit,
The input state of the data is congested by the congestion state determination means.
When it is determined that the voice communication band is in a congestion state, the voice communication band setting is performed.
To the predetermined low-level band
A multiplexing apparatus comprising : a congestion-time band setting means for setting . 3. A multiplexing means for multiplexing data input via a plurality of lines including a line for communicating voice data and transmitting the multiplexed data via a transmission line, and a band for transmitting data via the transmission line. A voice communication band setting means for setting a band for preferentially transmitting voice data input via a line for communicating the voice data in accordance with a time zone ; Other than communication line
Buffer means for temporarily storing data from different lines
And monitor the amount of data stored in the buffer means.
The accumulated data amount monitoring means and the data amount monitored by the accumulated data amount monitoring means
A congestion state determination unit that determines whether an input state of data from a line other than a line that communicates the voice data is a congestion state , based on a time period during which the setting by the voice communication band setting unit can be released. Voice priority setting release means for setting, in the time zone set by the voice priority setting release means,
When the input state of the data is determined to be a congestion state by the congestion state determination means, the congestion time band setting means to set the band set by the voice communication band setting means to a predetermined low-level band A multiplexing device comprising: