JP4361362B2 - Voice communication system - Google Patents

Description

  The present invention relates to a communication system that provides a voice communication service using VoDSL (Voice over DSL: a technology for realizing a voice call on a Digital Subscriber Line), and more particularly to a communication system that is arranged on a user side and via a DSL line. The present invention relates to a technique for improving deterioration of voice quality using a home device connected to the mobile phone and a voice gateway device arranged on the station side.

VoDSL is a technology that conforms to “Loop Emulation Service Using AAL2” of the ATM Forum. Unlike the method of transmitting packetized data by frequency multiplexing to the voice band, voice is packetized in the same way as data. Transmit by ATM cell multiplexing.
For example, Patent Document 1 and Patent Document 2 are known as conventional technologies of VoDSL.
In VoDSL, a home device arranged on the user side is connected to a DSL line. In the DSL line, broadband information can be transferred using a metal line. In VoDSL, ATM (Asynchronous Transfer Mode) cellular voice is transferred between a home device and an ATM network via a DSL line.

In the DSL line, the transmission speed is determined by the line condition between the in-home apparatus and the DSLAM (Digital Subscriber Line Access Multiplexer) which is a concentrator in the station. DSLAM is a collection of DSL modems, which bundles a plurality of DSL lines and connects them to a communication device such as a router and bridges them to a trunk line.
A conventional VoDSL communication system is configured as shown in FIG. 7, for example. That is, the in-home device 101 includes a DSL processing unit 102 and an encoding unit 103. The DSL processing unit 102 performs DSL control with the DSLAM. The encoding unit 103 has a function of converting voice data into ATM cells / decells. When an analog telephone terminal is connected to the encoding unit 103, the encoding unit 103 is also provided with a speech encoding / decoding function including A / D and D / A conversion.

The station-side voice gateway apparatus 104 includes an interface processing unit 105 and an encoding unit 106. The interface processing unit 105 terminates the transmission path interface. The encoding unit 106 has a function of converting voice data into ATM cells / decels.
JP 2000-165517 “ADSL System” JP 2000-236564 Telecommunication system and method with multi-channel digital subscriber line interface

In the DSL line used in the communication system as described above, the transmission speed may decrease when the line condition of the metal line deteriorates. When the transmission speed of the DSL line falls below the speed necessary for transferring the accommodated voice line, phenomena such as voice interruption, noise generation, and line disconnection occur.
For example, assuming that two voice lines are accommodated in one in-home device, a transmission rate of 128 kbps is required when the bit rate of voice coding is 64 kbps. When the transmission speed is lower than 128 kbps, the voice data is transmitted at a transmission speed of 64 kbps or less on each voice line, so that phenomena such as voice interruption, noise generation, and line disconnection occur.

In the conventional technology, when a plurality of voice lines are accommodated in one in-home device, when a phenomenon such as voice interruption, noise generation, or line disconnection occurs, it is manually determined by human judgment. The control is performed to block a part of a plurality of lines used, or to switch the voice encoding bit rate.
If the transmission speed required for the remaining lines is secured by blocking some lines, it is possible to avoid phenomena such as voice interruption, noise, and line disconnection for the remaining lines. it can. In addition, since the transmission rate required for each voice line is reduced by lowering the bit rate of voice coding, it is possible to avoid phenomena such as voice interruption, noise generation, and line disconnection.

In other words, in the prior art, after the occurrence of speech interruption, noise generation, line disconnection, etc., a block of some lines is manually controlled based on human judgment or a bit of voice coding is used. Unless the rate was lowered manually, it was not possible to avoid the occurrence of speech interruption, noise generation, line disconnection, etc. due to deterioration of the transmission speed of the DSL line.
The present invention provides a communication system capable of automatically avoiding phenomena such as voice interruption, noise generation, line disconnection, etc., when the transmission speed of a DSL line decreases. With the goal.

The second invention (Claim 2) comprises a voice gateway device arranged on the station side that manages communication and a home device arranged on the user side, and the DSLAM on the station side and the DSL processing of the home device In a voice communication system using a DSL line that uses voice-over-ATM technology in a DSL section that connects to a mobile station and constructs a plurality of voice lines on the same DSL line to provide a voice communication service, Line speed measuring means for successively measuring the line speed of the transmission line in the DSL section by negotiation between the DSL processing unit and the DSLAM, the number of voice lines accommodated in the own station, and the voice line of the own station Transmission rate calculation means for calculating a transmission rate required for communication as a required transmission rate based on the type of speech encoding being performed, and being accommodated in the own station When determining the number of voice lines actually used among a plurality of voice lines to be used as the number of used lines, if the line speed is lower than the required line speed, a predetermined priority is selected from the voice lines in communication Block at least a part of the voice lines selected according to the rank, and release the block of one voice line selected according to a predetermined priority order from the blocked voice lines when the line speed is higher than the required line speed. A number-of-lines determining means that performs information on the number of used lines or the number of blocked voice lines based on the number of used lines determined by the number-of-lines determining means; provided, wherein the voice gateway apparatus, Exiled at least some of the plurality of voice lines own station is managed according to the information information notified from the notification means of the in-home apparatus Characterized in that a voice circuit closing means for closing.

That is, in the first invention, when the detected line speed is smaller than the required transmission speed, there is a high possibility that a phenomenon such as voice interruption, noise generation, or line disconnection will occur. When detecting this, the in-home device and the voice gateway device block some voice lines.
For example, if two voice lines are accommodated in one in-home device and the bit rate of voice coding is 64 kbps, the required transmission rate is 128 kbps (64 × 2). Here, there is no problem if the line speed of the transmission line in the DSL section exceeds 128 kbps, but when the actual transmission speed falls below 128 kbps due to deterioration of the DSL line, transmission of 64 kbps or less on each voice line Since voice data is transmitted at a high speed, phenomena such as voice interruption, noise generation, and line disconnection occur. However, in such a case, in the present invention, the number of lines used is reduced before a phenomenon such as voice interruption, noise generation, line disconnection, etc. occurs. For example, one voice line is blocked, so the actual transmission rate is 128 kbps. Since the required transmission rate is reduced to 64 kbps (64 × 1) even if the speed is lower than the above, voice interruption, noise generation, line disconnection, etc. can be automatically prevented.

In addition, since the information on the number of used lines determined by the in-home device is notified to the voice gateway device, the voice gateway device also performs block control of some voice lines so that the number of used lines matches the in-home device side. Can do. Note that selection of a voice line to be blocked when the detected line speed becomes smaller than the required transmission speed may be performed in order according to a predetermined priority order, for example.
Further, when the line speed of the DSL line is recovered due to noise reduction or the like on the transmission line, the blocked voice line can be released and the number of voice lines can be restored.

According to a second invention (Claim 2 ), in the first invention, the voice gateway device manages its own information on the number of used lines or the number of blocked voice lines notified from the in-home device. Maintenance information notification means for notifying the maintenance terminal is further provided.

  According to the present invention, even when the transmission rate is lowered due to the degradation of the DSL line, it is possible to automatically prevent the occurrence of a phenomenon such as voice interruption, noise generation, line disconnection, etc. Although quality degradation or a decrease in the number of usable voice lines occurs due to a decrease in rate, it is possible to continue providing normal communication services.

(First embodiment)
One embodiment of a voice communication system using a technology related to the present invention will be described with reference to FIGS.
FIG. 1 is a block diagram showing a configuration example of the voice communication system of this embodiment. FIG. 2 is a flowchart showing an operation example of the in-home device of this embodiment. FIG. 3 is a flowchart showing an operation example of the voice gateway device of this embodiment.

  As shown in FIG. 1, an in-home device 11 arranged at a user's home is connected to a DSL line 20 and two telephone terminals T1 and T2. That is, the home device 11 accommodates two telephone lines. The in-home device 11 includes a DSL processing unit 12, an encoding unit 13, a DSL line rate measuring unit 14, a necessary line rate calculating unit 15, an encoding method determining unit 16, and a voice gateway device communication unit 17.

  In this example, the telephone office 21 includes a DSLAM 22, a voice gateway device 23, an exchange 24, and a voice gateway device maintenance terminal 25. The DSLAM 22 is a collection of DSL modems and accommodates a plurality of DSL lines 20. The DSLAM 22 is connected to the exchange 24 via the voice gateway device 23 in the telephone office 21. The voice gateway device maintenance terminal 25 is provided for monitoring and controlling the voice gateway device 23.

The voice gateway device 23 includes an interface processing unit 31, an encoding unit 32, an encoding control unit 33, an in-home device communication unit 34, and a maintenance terminal communication unit 35.
In the example of FIG. 1, the exchange 24 is connected to the voice gateway device 23, but it is also conceivable to connect it to a router or the like. Further, regarding the telephone terminals T1 and T2, it is possible to use an analog terminal or a digital terminal.

  The DSL processing unit 12 provided in the in-home device 11 performs predetermined DSL control with the DSLAM 22 connected via the DSL line 20. The encoding unit 13 manages audio encoding of two audio lines connected to the telephone terminals T1 and T2, and performs ATM cell conversion / decellation of audio data for each audio line. The encoding unit 13 is compatible with a plurality of types of audio encoding methods, and can change the bit rate of audio encoding.

The DSL line speed measurement unit 14 measures the line speed on the transmission line in the DSL section. Actually, since the line speed is sequentially determined by negotiation between the DSL processing unit 12 and the DSLAM 22, the DSL line speed measurement unit 14 acquires information on the determined line speed from the DSL processing unit 12 as a measurement value. be able to.
The required line speed calculation unit 15 is necessary for using all the accommodated voice lines based on the number of voice lines accommodated in the in-home device 11 and the type of voice coding (voice coding method). Is calculated as the required line speed.

The encoding method determining unit 16 is based on the line speed acquired by the DSL line rate measuring unit 14 and the required line rate calculated by the required line rate calculating unit 15 from a plurality of types of voice encoding methods prepared in advance. To determine the type of speech encoding. Examples of usable speech encoding methods include G.I. 711 (64 kbps) and G. 726 (32 kbps) is assumed.
The voice gateway device communication unit 17 communicates and negotiates with the voice gateway device 23, which is a higher-level device, via the DSL processing unit 12, the DSL line 20, and the DSLAM 22.

On the other hand, the interface processing unit 31 provided in the voice gateway device 23 terminates the transmission path interface. The encoding unit 32 converts the voice data into ATM cells / decels for each voice line. The encoding unit 32 is compatible with a plurality of types of audio encoding methods, and can change the bit rate of audio encoding.
The encoding control unit 33 controls the audio encoding method in the audio gateway device 23. The in-home device communication unit 34 communicates and negotiates with the in-home device 11 via the DSLAM 22 and the DSL line 20. The maintenance terminal communication unit 35 communicates with the voice gateway device maintenance terminal 25.

In this embodiment, when the line speed decreases in the DSL line 20, negotiation is performed between the in-home apparatus 11 and the voice gateway apparatus 23, and the voice encoding method is switched as necessary. Specific contents of control will be described below.
First, a specific operation of the home device 11 will be described with reference to FIG.
In step S11, the line speed Vt of the DSL line 20 is measured. Actually, since the line speed of the DSL line 20 is determined by negotiation between the DSL processing unit 12 and the DSLAM 22 when the state of the DSL line 20 changes, the DSL line speed measuring unit 14 is determined by the DSL processing unit 12. The line speed is obtained as a measured value, that is, the line speed Vt.

In step S12, the number NL of voice lines used by the in-home device 11 and the bit rate B of the voice coding method currently used are acquired. In the next step S13, the required line speed calculation unit 15 calculates the required line speed Vr using the following equation.
Vr = B × NL
For example, the voice encoding method used is G.I. Since 711 (B = 64 kbps), when the number of voice lines NL is 2, (Vr = 128 kbps). Also, for example, the voice encoding method used is G. Since 726 (B = 32 kbps), when the number of voice lines NL is 2, (Vr = 64 kbps).

In step S14, the line control unit 13 compares the line speed Vt measured in step S11 with the required line speed Vr obtained in step S13. If the condition of (Vt <Vr) is satisfied (the line speed is insufficient), it is identified in the next step S15 whether or not a voice encoding method slower than the current one can be selected.
For example, G. 711, G. 726 can now be selected, the current G. If G.711 is used, the G.B. Since 726 can be selected, the process proceeds to the next step S16.

In step S16, the encoding method determination unit 16 controls the encoding unit 13 to switch to a speech encoding method whose bit rate is one step lower than the current rate. That is, for example, G.K. 711 to G.G. The speech encoding method is switched to 726.
On the other hand, if the condition (Vt <Vr) is not satisfied in step S14 (the line speed is not insufficient), it is determined in step S17 whether a higher-speed speech encoding method than the present can be selected. Identify.

For example, G. 711, G. 726 can now be selected, the current G. If G. 726 is used, the G.B. Since 711 can be selected, the process proceeds to the next step S18.
In step S18, a comparison of (Vt> Vr + V1) is performed in order to confirm whether or not the line speed does not become insufficient even when the voice encoding method is switched to high speed. V1 represents the amount of change in the required line speed that accompanies the switching of the voice encoding method. If this condition is satisfied, the process proceeds to the next step S19.

In step S19, the encoding method determination unit 16 controls the encoding unit 13 to switch to a speech encoding method whose bit rate is one step higher than the current rate. That is, for example, G.K. 726 to G.G. The voice encoding method is switched to 711.
When step S16 or S19 is executed, the process proceeds to the next step S20, and the information related to the voice coding method after switching by the gateway device communication unit 17 to the in-home device communication unit 34 in the voice gateway device 23 To be notified.

Next, the operation of the voice gateway device 23 will be described with reference to FIG.
When the in-home device 11 switches the voice encoding method by the control described above and the information is transmitted to the voice gateway device 23, the processing of the voice gateway device 23 proceeds to S23 through steps S21 and S22 of FIG. .
In step S23, the encoding control unit 33 controls the encoding unit 32 so as to switch the voice encoding method for the voice line accommodated in the in-home device 11 that has transmitted the information to the method notified from the in-home device 11. .

In step S24, the terminal-to-maintenance terminal communication unit 35 notifies the voice gateway device maintenance terminal 25 of information related to the voice encoding method notified from the in-home device 11.
In other words, when the transmission speed is reduced in the DSL line 20 due to noise addition to the transmission path, the coding method determination unit 16 in the home device 11 determines whether or not the bit rate can be switched to the low-speed voice coding method. Are automatically identified by comparing Steps S14 and S15, and the voice coding system is automatically switched so that the transmission rate required for the usable voice line is equal to or lower than the line speed of the DSL line 20. Therefore, even when the line speed of the DSL line 20 decreases, normal communication service can be automatically continued within the range of the line speed.

Further, when the line speed of the DSL line 20 is restored due to noise reduction on the transmission line, etc., step S19 is executed, so that the voice encoding method to be used is automatically set to a high quality with a high bit rate. Therefore, a voice communication service with high communication quality can be provided.
Further, when the in-home device 11 switches the voice encoding method, the information is notified to the voice gateway device 23 which is a higher-level device, and the voice assigned to the corresponding home device 11 on the voice gateway device 23 side as well. It is possible to switch the voice coding system of the line.

Therefore, it is not necessary for the user to manually switch the voice coding method, and when the line speed decreases, it is automatically avoided before the occurrence of speech interruption, noise, line disconnection, etc. can do.
(Second Embodiment)
One embodiment of the voice communication system of the present invention will be described with reference to FIGS. This form corresponds to claims 1 and 2 .

FIG. 4 is a block diagram showing a configuration example of the voice communication system of this embodiment. FIG. 5 is a flowchart showing an example of the operation of the in-home device of this embodiment. FIG. 6 is a flowchart showing an operation example of the voice gateway device of this embodiment.
This form is a modification of the first embodiment, and the number of voice lines to be used is switched instead of switching the voice coding system in accordance with a change in the line speed. In FIG. 4, elements corresponding to those in the first embodiment are denoted by the same reference numerals.

In this embodiment, the line speed measuring means, the transmission speed calculating means, the number of lines determining means, the information notifying means and the voice line blocking means of claim 1 are respectively a DSL line speed measuring section 14, a necessary line speed calculating section 15, and a used line. This corresponds to the number determination unit 52, the voice gateway device communication unit 17, and the line control unit 55. Further, the maintenance information notification means of claim 2 corresponds to the maintenance terminal communication unit 35.

  As shown in FIG. 4, the in-home device 11B arranged at the user's home is connected to the DSL line 20 and the two telephone terminals T1 and T2. That is, the home device 11 accommodates two telephone lines. The in-home device 11B includes a DSL processing unit 12, a line control unit 51, a DSL line speed measurement unit 14, a necessary line speed calculation unit 15, a used line number determination unit 52, and a voice gateway device communication unit 17.

  In this example, the telephone station 21 includes a DSLAM 22, a voice gateway device 23B, an exchange 24, and a voice gateway device maintenance terminal 25. The DSLAM 22 is a collection of DSL modems and accommodates a plurality of DSL lines 20. The DSLAM 22 is connected to the exchange 24 in the telephone office 21 via the voice gateway device 23B. The voice gateway device maintenance terminal 25 is provided for monitoring and controlling the voice gateway device 23B.

The voice gateway device 23B includes an interface processing unit 31, a line control unit 55, an in-home device communication unit 34, and a maintenance terminal communication unit 35.
The DSL processing unit 12 provided in the in-home device 11B performs predetermined DSL control with the DSLAM 22 connected via the DSL line 20. The line control unit 51 manages the number of lines used for two voice lines connected to the telephone terminals T1 and T2, and controls blockage and release of the line for each voice line.

The DSL line speed measurement unit 14 measures the line speed on the transmission line in the DSL section. Actually, since the line speed is sequentially determined by negotiation between the DSL processing unit 12 and the DSLAM 22, the DSL line speed measurement unit 14 acquires information on the determined line speed from the DSL processing unit 12 as a measurement value. be able to.
The required line speed calculation unit 15 is necessary for using all the accommodated voice lines based on the number of voice lines accommodated in the in-home device 11 and the type of voice coding (voice coding method). Is calculated as the required line speed.

The used line number determining unit 52 determines the number of usable voice lines based on the line speed acquired by the DSL line speed measuring unit 14 and the required line speed calculated by the required line speed calculating unit 15.
The voice gateway device communication unit 17 communicates and negotiates with the voice gateway device 23B, which is a host device, via the DSL processing unit 12, the DSL line 20, and the DSLAM 22.

On the other hand, the interface processing unit 31 provided in the voice gateway device 23B terminates the transmission path interface. The line control unit 55 controls blocking and releasing of blocking for each voice line.
The in-home device communication unit 34 communicates and negotiates with the in-home device 11B via the DSLAM 22 and the DSL line 20. The maintenance terminal communication unit 35 communicates with the voice gateway device maintenance terminal 25.

In this embodiment, when a decrease in line speed occurs in the DSL line 20, negotiation is performed between the in-home device 11B and the voice gateway device 23B, and the number of voice lines that can be used by the in-home device 11B is determined as necessary. Switch. Specific contents of control will be described below.
First, a specific operation of the home device 11B will be described with reference to FIG.

In step S31, the line speed Vt of the DSL line 20 is measured. Actually, since the line speed of the DSL line 20 is determined by negotiation between the DSL processing unit 12 and the DSLAM 22 when the state of the DSL line 20 changes, the DSL line speed measuring unit 14 is determined by the DSL processing unit 12. The line speed is obtained as a measured value, that is, the line speed Vt.
In step S32, the number NL of voice lines used by the in-home device 11B and the bit rate B of the voice coding method currently used are acquired. In the next step S33, the necessary line speed calculation unit 15 calculates the necessary line speed Vr using the following equation.
Vr = B × NL
For example, the voice encoding method used is G.I. Since 711 (B = 64 kbps), when the number of voice lines NL is 2, (Vr = 128 kbps). Also, for example, the voice encoding method used is G. Since 726 (B = 32 kbps), when the number of voice lines NL is 2, (Vr = 64 kbps).

In step S34, the used line number determining unit 52 compares the line speed Vt measured in step S31 with the required line speed Vr obtained in step S33. If the condition of (Vt <Vr) is satisfied (the line speed is insufficient), it is confirmed in the next step S35 that (NL> 0), and the process proceeds to step S36.
In step S36, the number NL of voice lines is reduced by one. In the next step S37, the line control unit 51 selects one of the used voice lines according to a predetermined priority order and closes it. In this case, in the next step S38, the voice gateway device communication unit 17 notifies the upper voice gateway device 23B of the number of usable voice lines indicating that one corresponding voice line is blocked.

Note that a change may be made so that a plurality of NLs are reduced in step S36 until the condition of (Vt> Vr) is satisfied. The upper-level device is notified of the finally determined number of voice lines NL in step S38.
On the other hand, if the condition (Vt <Vr) is not satisfied in step S34 (the line speed is not insufficient), the number NLmax of voice lines is set to the maximum value NLmax (maximum available) in the next step S39. Number of voice lines).

If it is confirmed that (NL <NLmax), in the next step S40, it is further confirmed whether or not the condition of (Vt> Vr + V2) is satisfied. V2 is a value corresponding to the bit rate of one voice line.
When the condition of (Vt> Vr + V2) is satisfied, the number of voice lines NL is increased by 1 in the next step S41. In the next step S42, according to a predetermined priority order, the line control unit 51 selects one of the blocked voice lines and releases it. In this case, in the next step S38, the voice gateway device communication unit 17 notifies the higher-order voice gateway device 23B of the number of usable voice lines indicating that the corresponding one voice line has been unblocked.

In addition, you may change so that multiple NL may be increased by step S36 in the range which satisfy | fills the conditions of (Vt> Vr). The upper-level device is notified of the finally determined number of voice lines NL in step S38.
When the voice gateway device 23B receives the information on the number of voice lines from the in-home device 11B, the process proceeds from steps S51 and S52 shown in FIG. 6 to S53 and checks the change in the number of voice lines. If the notified number of voice lines decreases, in step S54, the line control unit 55 closes one voice line according to a predetermined priority order for the voice lines accommodated in the in-home device 11B. Control. Actually, one or more voice lines are blocked until the number NL of voice lines notified from the in-home device 11B is reached.

  If the number of voice lines notified from the in-home device 11B increases, in step S55, the line blocked in the voice line accommodated in the in-home device 11B is set according to a predetermined priority order. The line control unit 55 controls so as to release the blockage of one voice line. Actually, one or more voice lines are released from the block until the number of voice lines NL notified from the in-home device 11B is reached.

Further, the information on the number of voice lines notified from the in-home device 11B is notified from the maintenance terminal communication unit 35 to the voice gateway device maintenance terminal 25 in step S56.
In other words, when the transmission speed decreases in the DSL line 20 due to noise addition to the transmission path, the used line number determination unit 52 automatically determines whether or not at least some of the voice lines need to be blocked by comparing the step S34. And a part of the accommodated voice lines is blocked in a predetermined order so that the transmission speed required for the usable voice line is equal to or lower than the line speed of the DSL line 20. Therefore, even when the line speed of the DSL line 20 decreases, normal communication service can be automatically continued for a part of the voice lines that can be used within the range of the line speed.

Further, when the line speed of the DSL line 20 is recovered due to noise reduction or the like on the transmission line, steps S41 and S42 are executed, so that the blocked voice line is released and the number of voice lines is restored. Can be returned to.
Further, when the in-home device 11B performs blockage and release of the voice line, the information is notified to the voice gateway device 23B, which is a higher-level device, so that the voice gateway device 23B also assigns the information to the corresponding in-home device 11B. It is possible to block and release the blocked voice line.

Therefore, there is no need for the user to manually block the voice line, and when the line speed drops, it is automatically avoided before the phenomenon of voice interruption, noise generation, line disconnection, etc. occurs. can do.
It is possible to combine the technique of the first embodiment and the technique of the second embodiment. That is, when the transmission speed of the DSL line is reduced due to noise addition to the transmission line, the voice coding method for the voice line is determined so that the speed required for the voice line is less than the measured value of the DSL line speed. In addition, when the transmission speed of the DSL line is further lowered, control is performed to block the voice line in a predetermined order so that the speed necessary for the usable voice line is equal to or less than the measured value of the DSL line speed. It can also be a method.

It is a block diagram which shows the structural example of the audio | voice communication system of 1st Embodiment. It is a flowchart which shows the operation example of the subscriber | terminal apparatus of 1st Embodiment. It is a flowchart which shows the operation example of the voice gateway apparatus of 1st Embodiment. It is a block diagram which shows the structural example of the audio | voice communication system of 2nd Embodiment. It is a flowchart which shows the operation example of the subscriber | terminal apparatus of 2nd Embodiment. It is a flowchart which shows the operation example of the voice gateway apparatus of 2nd Embodiment. It is a block diagram which shows the structural example of the conventional audio | voice communication system.

Explanation of symbols

11, 11B In-home device 12 DSL processing unit 13 Encoding unit 14 DSL line rate measuring unit 15 Required line rate calculating unit 16 Encoding method determining unit 17 Voice gateway device communication unit 20 DSL line 21 Telephone station 22 DSLAM
23, 23B Voice gateway device 24 Exchange 25 Voice gateway device maintenance terminal 31 Interface processing unit 32 Encoding unit 33 Encoding control unit 34 In-home device communication unit 35 To maintenance terminal communication unit 51 Line control unit 52 Number of used line determination unit 55 Line control unit 101 Home device 102 DSL processing unit 103 Encoding unit 104 Voice gateway device 105 Interface processing unit 106 Encoding unit T1, T2 Telephone terminal

Claims (2)

A voice gateway device disposed on the station side that manages communication and a home device disposed on the user side, and Voice-over in a DSL section that connects the DSLAM on the station side and the DSL processing unit of the home device. -In a voice communication system using a DSL line that uses ATM technology to provide a voice communication service by constructing a plurality of voice lines on the same DSL line ,
The in-home device has a line speed measuring means for sequentially measuring the line speed of the transmission line in the DSL section by negotiation between the DSL processing unit and the DSLAM;
Transmission that calculates the transmission rate required for communication as the required transmission rate based on the number of voice lines accommodated in the local station and the type of voice encoding used in the local voice line Speed calculation means;
When the number of voice lines actually used among the plurality of voice lines accommodated in the own station is determined as the number of used lines, if the line speed is lower than the required line speed, the number of voice lines in communication is determined. At least a part of voice lines selected in accordance with a predetermined priority order are blocked, and if the line speed is higher than the required line speed, one selected in accordance with a predetermined priority order from the blocked voice lines. A means for determining the number of lines for releasing the blockage of the voice line;
Information notifying means for notifying the voice gateway device on the station side of information relating to the number of used lines or the number of voice lines to be blocked based on the number of used lines determined by the number of lines determining means,
The voice gateway device is provided with voice line blocking means for sequentially blocking at least a part of a plurality of voice lines managed by the own station according to information notified from the information notification means of a home device. A voice communication system using a DSL line . 2. The voice communication system using a DSL line according to claim 1 , wherein the voice gateway apparatus sends information on the number of used lines or the number of blocked voice lines notified from the in-home apparatus to a maintenance terminal that manages the local station. A voice communication system using a DSL line, further comprising maintenance information notifying means for notifying the user.

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