JP3221393B2 - Hybrid multiplexer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to traffic control in hybrid multiplex communication in which a trunk line is multiplexed with a hybrid of a frame relay (hereinafter referred to as FR) and a TDM (voice).

[0002]

2. Description of the Related Art An on-demand hybrid multiplexer (hereinafter, referred to as multiplexing) that multiplexes a trunk line with a hybrid of FR and TDM (voice) and expands the TDM band and narrows the FR band in response to the occurrence of a voice call. Device), F
When performing data communication with R terminal and voice terminal,
If the TDM band increases as the voice path increases, and the sum of the FR band and the TDM band exceeds the bandwidth of the trunk line, voice data requiring real-time performance is prioritized.
A part of the band used as the FR band is replaced with the TDM band. In this state, the required bandwidth is secured according to the number of voice paths in the TDM band, so there is no possibility that frames will be discarded due to congestion. There is a possibility that congestion will occur in the FR data band in the multiplexing device due to the band shortage.

Therefore, conventionally, for example, Japanese Patent Laid-Open No. 9-29
In the time division multiplex transmission device described in Japanese Patent No. 4140, the band allocation between the on-demand band and the FR band is variably set according to a connection request from an on-demand terminal.

[0004]

However, in the above-mentioned prior art, when the FR band is reduced, congestion control is supported on the terminal side, and frame discarding can be prevented only when a clock is being generated. It is.

[0005] An object of the present invention is to perform congestion control on the multiplexing device side so that the F is not supported.
It is another object of the present invention to provide a hybrid multiplexing apparatus for preventing the R terminal from discarding frames.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a hybrid multiplexing apparatus for multiplexing a trunk line with a hybrid of a frame relay and a TDM (voice). Monitor and calculate the usage rate, determine the congestion state by comparing with a predetermined value, change the speed of the clock supplied to the corresponding frame relay terminal, and adjust the output from each reception buffer to the relay line Monitor the use state of the transmission buffer to calculate the utilization rate, determine the congestion state by comparing with a predetermined value, change the speed of the clock supplied to the frame buffer terminal corresponding to the lowest priority reception buffer, When a voice path connection request is received from a voice terminal in the congestion state, voice path disconnection processing is performed on the voice terminal.

The present invention also relates to a hybrid multiplexing apparatus for multiplexing a trunk line with a hybrid of a frame relay and a TDM (voice), wherein a receiving buffer corresponding to a frame relay terminal on a one-to-one basis is provided separately for the frame relay terminal. A clock generation unit that supplies a clock to the reception buffer, monitors the usage state of the reception buffer, calculates the usage rate, and determines the congestion state of the frame relay data band by comparing with a predetermined value. A buffer monitoring unit that monitors the use state of the transmission buffer that adjusts the output to calculate the usage rate and compares the calculated rate with a predetermined value to determine the congestion state of the frame relay data band, and the reception buffer is in a congestion state Is determined, the speed of the clock supplied to the frame relay terminal corresponding to the determined reception buffer is reduced, A clock operation unit that instructs the clock generation unit to reduce the speed of the clock supplied to the frame relay terminal corresponding to the reception buffer having the lowest priority when the transmission buffer is determined to be in the congestion state; and And a path setting monitoring unit that executes a voice path disconnection process when there is a voice path connection request from the voice terminal in the state.

[0008] In a hybrid multiplexing apparatus according to a preferred embodiment of the present invention, the clock speed is reduced when the buffer usage rate is equal to or higher than a predetermined clock change point, and the clock return point is determined when the buffer usage rate is predetermined. It is characterized in that it is restored when it becomes the following.

[0009]

[0010]

[0011]

[0012]

Next, an embodiment of the present invention will be described.

A hybrid multiplexing device according to the present invention is a hybrid multiplexing device for multiplexing a trunk line with a hybrid of a frame relay and a TDM (voice). In the hybrid multiplexing device, congestion of a frame relay data band accompanying increase / decrease of voice calls from voice terminals. It is characterized in that the state is monitored and the clock speed supplied to the frame relay terminal is changed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention. Referring to FIG. 1, the present hybrid multiplexing device (hereinafter, referred to as a multiplexing device) 3 includes an FR processing unit 31, an audio data processing unit 32, and a multiplexing processing unit 33.

The FR processing unit 31 receives the FR from the FR terminal 1.
The data is processed and sent to the multiplex processing unit 33, and the audio data processing unit 32 processes the audio data from the audio terminal 2 input via the PBX 4 and passes it to the multiplex processing unit 33. The multiplexing unit 33 performs multiplexing processing on the FR data and the audio data, and outputs the result to the relay line 5.

The FR processing unit 31 has three FR terminals 1 and 1
Using the one-to-one reception buffer 311 and a timer interrupt as a trigger, the state of the reception buffer 311 is monitored, the usage rate of each reception buffer is calculated, and it is determined whether the usage rate is greater than a predetermined value. Determined buffer monitoring unit 312
A clock generator 314 that individually supplies a clock to each FR terminal 1, and a clock operating unit that changes the speed of a clock supplied from the clock generator 314 to each FR terminal 1 based on the result of determination by the buffer monitor 312. 313
And The buffer monitoring unit 312 also calculates the usage rate of the transmission buffer in the multiplex processing unit 33, and when it exceeds a predetermined value, determines that the FR data band is in a congested state, and Operates to reduce the clock speed of the FR buffer 1 corresponding to the lowest priority.

When the buffer monitoring unit 312 determines that the FR data band is in a congested state, the voice data processing unit 32 performs a voice path disconnection process upon receiving a voice path connection request from the voice terminal 2. It has a setting monitoring unit 321.

The multiplex processing unit 33 includes a transmission buffer 33 for buffering the FR data from the reception buffer 311.
1 and a multiplex processing unit 332 that multiplexes the FR data from the transmission buffer 331 and the audio data from the audio data processing unit 32 in a hybrid manner and sends the multiplexed data to the relay line 5.

Next, the operation of this embodiment will be described.

In FIG. 1, data transmitted from the three FR terminals 1 uses the reception buffer 311 and the transmission buffer 331 in the multiplexer 3. If the amount of traffic flowing into the multiplexer 3 exceeds the processing capacity, data is temporarily stored in the reception buffer 311 or the transmission buffer 331. When this state continues, data accumulates in the buffer, and the buffer usage rate increases. Here, the buffer monitoring unit 312 monitors the buffer usage rate, and the clock operation unit 313 and the path setting monitoring unit 321 operate based on the result determined here.

FIG. 2 illustrates a criterion for judging the buffer usage rate in the buffer monitoring unit 312 of FIG.
ockPoint (hereinafter referred to as CP), RecoverPoi
nt (hereinafter RP) is set. The CP is a reference value for positioning the buffer usage rate N% as light congestion and reducing traffic flowing into the multiplexer 3. When the reception buffer 311 reaches this, the supply clock speed to the FR terminal 1 is changed to the CIR of PVC, and when this is the transmission buffer 331, the supply clock speed of the lowest priority port is similarly changed. change. The RP is a reference value that sets the buffer usage rate M% as the congestion release and returns the value before the change when the supply clock speed has been changed due to the congestion state.

FIG. 3 is a flowchart showing the processing of the FR processing unit 3. The buffer monitoring unit 312 checks how much the reception buffer 311 and the transmission buffer 331 are used (S1). As a result, if the buffer usage rate is equal to or less than RP (S2), it is considered that the processing capacity of the multiplexing device 3 has room. At this time, if the multiplexer 3 changes the clock speed (S3),
Return to the state before the change (S4 to S8).

On the other hand, in S2, the buffer usage rate becomes R
If P or more, the processing of S9 to S13 is performed. In S9,
If the value is equal to or larger than the CP, the remaining portion of the unused portion of the buffer is small, indicating that the multiplexing device 3 is in a congestion state. When the corresponding buffer is the reception buffer 311 (S1
0) sets the clock speed supplied to the FR terminal 1 to C
It is lowered to IR (S12). If the buffer is the transmission buffer 331 (S10), the supply clock speed of the port with the lowest priority is similarly reduced (S12).
By performing such an operation, the amount of traffic flowing into the multiplexer 3 is reduced. When the clock speed is reduced (S1
In 2), a message to that effect is displayed (S13), and the determination is made in S3.

In step S9, if it is not equal to or larger than the CP, the buffer utilization is between the RP and the CP at this time, and nothing is performed. This is because if the clock speed is immediately returned to the value before the change, the stability is lacking just because the clock speed is not higher than CP.
2) In order to reserve the change of the clock speed.

The above-described processing of FIG. 3 is programmed, the program is recorded on the recording medium 6 readable by the FR processing unit 31, and is read into the memory 315 in the FR processing unit 31 as shown in FIG. It can also be executed. This program includes a frame relay terminal and one
A process of monitoring the use state of the one-to-one corresponding reception buffer to calculate a use ratio, and a process of comparing the use ratio with a predetermined value to determine whether it is necessary to change the speed of a clock supplied to the frame relay terminal. And a process of changing the speed of the clock supplied to the corresponding frame relay terminal when the clock speed change is determined.

FIG. 4 shows the path setting monitor 32 of FIG.
3 is a flowchart illustrating a process of FIG. The path setting monitoring unit 321 is activated when a voice path connection request is received from the voice terminal 2, and when at least one of the FR ports in the multiplexer 3 is in a congestion state, the voice that has made the voice path connection request The voice path disconnection process is performed on the terminal 2. This is to prevent the FR data band from being discarded due to a decrease in the FR data band when the voice path is established in spite of the congestion state of the FR data band. is there.

[0028]

According to the present invention, the trunk line can be switched between FR and TDM.
(Voice), and the voice path is changed to F according to the generation of the voice call.
In a multiplexing device that allocates to the R data band,
If the device is congested, the multiplexing device itself
Controlling the amount of traffic flowing into the device by lowering the clock supplied to the terminal, avoiding congestion at its own port, and suppressing new voice paths so as not to further increase the traffic volume of the entire device Thus, it is possible to wait for a reduction in the traffic volume not only at the congested own port but also at other ports.

For these reasons, even when an FR terminal that does not support congestion control is connected, FR data is less likely to be discarded.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is a diagram illustrating a clock change point and a clock return point in the embodiment of FIG.

FIG. 3 is a flowchart showing a process of an FR processing unit 31 in the embodiment of FIG.

FIG. 4 is a flowchart showing a process of a path setting monitoring unit 321 in the embodiment of FIG.

FIG. 5 is a block diagram of another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 FR terminal 2 Audio terminal 3 FR processing unit 4 PBX 5 Trunk line 6 Recording medium 31 FR processing unit 32 Audio data processing unit 33 Multiplex processing unit 311 Receive buffer 312 Buffer monitoring unit 313 Clock operation unit 314 Clock generation unit 315 Memory 321 Path Setting monitoring unit 331 Transmission buffer 332 Multiplex processing unit

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yukio Mitani 5-7-1 Shiba, Minato-ku, Tokyo Within NEC Corporation (72) Inventor Fumihide Shinmura 5-7-1 Shiba, Minato-ku, Tokyo NEC (56) References JP-A-9-294140 (JP, A) JP-A-9-261295 (JP, A) JP-A-6-343072 (JP, A) JP-A-1-218242 (JP, A) A) JP-A-63-209247 (JP, A) JP-A-7-79253 (JP, A) JP-A-3-270342 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) ) H04J 3/00-3/26 H04L 12/28 H04L 12/56

Claims (3)

(57) [Claims] In a hybrid multiplexing apparatus for multiplexing a trunk line with a hybrid of a frame relay and a TDM (voice), a usage rate of a receiving buffer corresponding to a frame relay terminal is monitored by monitoring a use state of the receiving buffer. A congestion state is determined by comparison with a predetermined value, a speed of a clock supplied to a corresponding frame relay terminal is changed, and a use state of a transmission buffer for adjusting an output from each of the reception buffers to the relay line is monitored. The usage rate is calculated, the congestion state is determined by comparing with a predetermined value, and the speed of the clock supplied to the frame relay terminal corresponding to the reception buffer corresponding to the lowest priority is changed. When receiving a voice path connection request from a terminal, the hybrid multiplexing apparatus performs a voice path disconnection process on the voice terminal. 2. A hybrid multiplexing apparatus for multiplexing a trunk line with a hybrid of a frame relay and a TDM (voice), a receiving buffer corresponding to a frame relay terminal on a one-to-one basis, and a clock being individually supplied to the frame relay terminal. A clock generation unit that monitors the usage state of the reception buffer, calculates the usage rate, determines the congestion state of the frame relay data band by comparing with a predetermined value, and outputs the output from each reception buffer to the relay line. A buffer monitoring unit that monitors a use state of a transmission buffer to be adjusted, calculates a use rate, and compares the calculated rate with a predetermined value to determine a congestion state of a frame relay data band; and that the reception buffer is determined to be in a congestion state. And reduce the speed of the clock supplied to the frame relay terminal corresponding to the determined reception buffer, and When it is determined that the congestion state, the clock operation unit that instructs the clock generation unit to reduce the speed of the clock supplied to the frame relay terminal corresponding to the lowest priority reception buffer, the congestion state A path setting monitoring unit that executes a voice path disconnection process when a voice path connection request is received from a voice terminal at a certain time. 3. The clock speed is reduced when the buffer usage rate is equal to or higher than a predetermined clock change point, and is restored when the buffer usage rate is equal to or lower than a predetermined clock return point. Item 3. The hybrid multiplexing device according to item 1 or 2.