JPH03259646A - Packet exchange line selection system - Google Patents

Abstract

PURPOSE:To improve the utilizing efficiency of an integrated service digital communication network and to reduce a packet communication time by setting a fixed communication line with plural low speed packet calls and a variable communication line only when a high speed packet call takes place. CONSTITUTION:A communication line selection means 100 analyzes a communication speed of a packet call whose setting is on request and selects a fixed communication line F connecting a caller and a called packet processing unit 21 as packet call setting when the communication speed is lower than a predetermined reference value and requests the setting of a variable communication line C for packet call reaching the called packet processing unit 21 to an integrated service digital communication network 1 when the communication speed is higher than the predetermined reference value. Thus, the fixed communication line is efficiently used without a long wait time by plural low speed packet calls and the variable communication line is set only when a high speed packet call takes place and used efficiently, then the utilizing efficiency of the integrated service digital communication network is improved and the packet communication time is also reduced.

Description

[Detailed Description of the Invention] [Summary] Regarding a packet switching line selection method in an integrated service digital communication network equipped with a plurality of packet processing devices, the present invention provides an efficient use of fixed communication channels connecting packet processing devices, and In an integrated service digital communication network that includes a plurality of packet processing devices connected to each other via fixed communication channels, each packet processing device is
The communication speed of the packet call that is requested to be set up is analyzed, and if the communication speed is lower than a predetermined standard value, the packet call is set up using a fixed communication channel that connects the packet processing devices on the calling and called sides. If the communication speed exceeds the standard value, a communication path selection means is provided that requests the integrated service digital communication network to set up a variable communication path for the packet call to the packet processing device on the called side. Configure.

[Industrial application field]

The present invention relates to a packet switching line selection method in an integrated service digital communication network including a plurality of packet processing devices.

[Conventional technology]

FIG. 6 is a diagram showing an example of a conventional comprehensive service digital communication network.

In Figure 6, service comprehensive digital communication! iii
The system includes two sets of l5DN switches (
ISW) 2 (Individual 15DN switch (ISW) 2.
and 2□ (hereinafter the same) are provided and are connected to each other by a plurality of inter-office relay lines 4.

Each I5DN switch (ISW) 2 is provided with a packet processing device (PH) 21 that executes packet switching processing, and is connected to each other by an intra-office trunk line 22.

In addition, the inter-office relay line 4, and each intra-office relay line 122° and 2
2□ both adopt the common line signal system, and each has a common line signal path C34, and CS+ and C32.

The packet terminal devices s and 31□ accommodated in the l5DN exchange (ISW) 2+ are connected to the l5DN exchange @ (ISW
)2. , the packet processing device (PH) 211 and the intra-office trunk line 221, and the packet terminal devices 321 and 3□2 accommodated in the I5DN switch (ISW) 2z )2□, packet processing word W(PH) 212, and intra-office trunk line 22□, mutual packet communication becomes possible.

Also, the packet processing device (PH) 21. and 21□, there is an l5DN switch (ISW) 2. , a semi-permanent fixed communication path F having a communication speed of, for example, 64 kilobits per second is set in advance via an inter-office trunk line 4 and an I5DN exchange (ISW) 2□.

l5DN switch (ISW)2. The packet terminal device 31I or 3.2 accommodated in the
) Packet terminal device 3 z+ or 3 accommodated in 2□
□2 means l5DN exchange (ISW) 2I and 2g,
Mutual packet communication is possible via the packet processing devices (PH) 211 and 21□ and the fixed communication path F.

In such a state, if the packet terminal device 3□ equipped with high-speed packet communication capability desires high-speed packet communication with the packet terminal device 3□1 also equipped with high-speed packet communication capability, the packet terminal device 3□ The packet processing device that received the high-speed packet call setup request from the terminal device 3
PH) 21° is connected to the packet terminal device 3□ via the fixed communication path F that connects to the packet processing device f(PH) 21□.
After setting up a call to 3.1, high-speed packet communication is executed between the packet terminal devices 3.1 and 3.z+.

As a result, the fixed communication path F is dedicated to high-speed packet communication between the packet terminal devices 31° and 3□1.

In such a state, if the packet terminal bag W3.2, which has a low-speed packet communication capability, desires low-speed packet communication with the packet terminal device 3□2, which also has a low-speed packet communication capability, The packet processing device (PH) 21° that received the low-speed packet call setup request from the packet terminal device 31□
Since the fixed communication path F leading to the packet terminal device 3tZ is occupied by high-speed packet communication between the packet terminal devices 3□ and 3□1, the packet terminal device 3tZ
The waiting time for packet communication between and 3□2 becomes longer.

[Problem to be solved by the invention]

As is clear from the above explanation, in conventional integrated service digital communication networks, each packet processing device (PH
) 21+ and 21□ are connected by a fixed communication path F, and the packet processing word W (P H) 21 +
All packet communications spanning between and 21 As a result, other packet communications often wait within the packet processing devices (PH) 21□ and 21□ until the high-speed packet communication is completed, resulting in a problem that the packet communication time increases.

In order to solve this problem, a packet processing device (PH)
21. Although it is considered to increase the number of fixed communication channels F between 2. The inter-office trunk line 4 between 2 and 2□ will be occupied by many fixed communication paths F dedicated to packet communications, and there is a risk that communications other than packets will be overwhelmed.

SUMMARY OF THE INVENTION An object of the present invention is to realize a means for efficiently using a fixed communication path connecting packet processing devices and not burdening communication other than packets.

[Means to solve the problem]

FIG. 1 is a diagram showing the principle of the present invention.

In FIG. 1, reference numeral 1 denotes an integrated service digital communication network to which the present invention is applied, 21 a plurality of packet processing devices provided in the integrated service digital communication network 1, 3 a packet terminal device, and F an inter-packet processing device 21. It is a fixed communication channel that connects

100 is a communication path selection means provided in each packet processing device 21 according to the present invention.

C is a variable communication path set between the packet processing devices 21 according to the present invention.

[Effect]

The communication path selection means 100 analyzes the communication speed of the packet call for which setting is requested, and if the communication speed is lower than a predetermined reference value, the communication path selection means 100 selects the packet processing device 21 on the calling side and the called side. The fixed communication path F to be connected is selected for packet call setting, and if the communication speed exceeds the standard value, the setting of the variable communication path C for packet calls to the packet processing device 21 on the called side is set as a service integrated. Request for digital communication ml.

Therefore, the fixed communication channel can be used efficiently by multiple low-speed packet calls without having to wait for a long time, and the variable communication channel is set up only when a high-speed packet call occurs, so it can also be used efficiently. Therefore, the usage efficiency of the integrated service digital communication network is improved and the packet communication time is also shortened.

〔Example] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram showing an integrated service digital communication network according to an embodiment of the present invention, FIG. 3 is a diagram showing an example of the packet call setting process in FIG. 2, and FIG. 4 is a diagram showing an example of the packet call setting process in FIG. 5 is a diagram showing an example of a high-speed packet call setting process, and FIG. 5 is a diagram showing an example of a low-speed packet call setting process in FIG. 2. Note that the same reference numerals indicate the same objects throughout the figures.

In FIG. 2, the communication path selection means 10 in FIG.
0, a communication path setting unit (Fe2) 211 (individual communication path setting units (Fe2) are referred to as 2111 and 211□, hereinafter the same) is provided in each packet processing device (PH) 21.

In Figures 2 to 5, the l5DN switch (ISW)
2. A high-speed (for example, 48 kilobits per second) packet terminal device 31. But it is also fast (e.g. 48 per second
6 per second between the packet terminal device 3□,
An information channel (so-called B
desiring high-speed packet communication via a channel), and sends a call setup message 5ETUP (A2
5. Assemble P, S) and install I5DN switch (IsW)2.
to communicate.

The ISDN switch (ISW) that received the call setup message 5ETUP (A2., P, S)2. sends a call setup acceptance message CALLPR to the packet terminal device 3□.
Call setup message transmitted after returning OC
When it analyzes T U P (A z 0, P, S) and determines that it is a request to set up a packet call using an information channel, it selects any vacant in-station trunk line 221 other than the fixed communication channel F and transfers the incoming call packet. Address A28 of terminal device 3□,
Packet exchange mode information P and communication speed information S (=
address signal IAM (Az
+, P, S), and the packet processing device (PH) 21. At the same time, the packet terminal device 3□ and the packet processing device (PH) 21+
Set up an information channel between

The packet processing device (PH) 211 that has received the address signal A M (All, p, s) sends an address reception completion signal and a response signal ACM/ANM to the I5DN switch (ISW) 21 via the common line signal path CS. At the same time, the communication path setting unit (Fe2) 211. Start.

The activated communication path setting unit (Fe2) 211. analyzes the received address signal IAM (A, , P, S) and determines the specified communication speed information S (=48 kilobits per second)
is compared with a predetermined standard value (for example, 24 kilobits per second), and it is confirmed that the communication speed information S (=48 kilobits per second) exceeds the standard value (-24 kilobits per second) (step S1 in Fig. 3). , the call setup for the called packet terminal device 3□1 is performed by the I5DN switch (ISW) 2. without using the fixed communication path F connecting with the packet processing device (PH) 21□ on the called side. 2□, and inter-office trunk line 4, it is decided to set up a communication path for high-speed packet calls (hereinafter referred to as variable communication path C), and any vacant intra-station relay other than fixed communication path F Select the line 221, assemble the address signal I AM (A21, P, S), and send it to the I5DN exchange (I
SW) 2, and packet processing device (PH) 21□
request to set up variable communication channel C between
Figure step S4).

Received address signal IAM (A, , P, S)
In order to set up the requested variable communication channel C, the 5DN exchange (ISW) 2+ selects any vacant inter-office trunk line 4 other than the fixed communication channel F, and sends the address signal IAM (Ail,
P, S) as the common line signal path CS.

It is transmitted to the 15DN switch (ISW) 2□ via.

l that received address signal IAM (A2., P, S)
In order to set up the requested variable communication channel C, the 5DN exchange (ISW) 2□ selects any vacant intra-office trunk line 22□ other than the fixed communication channel F, and sends the address signal IAM(Az+,
P, S) are transmitted to the packet processing device (PH) 212 via the common line signal path C3.

The packet processing device (PH) 21□, which has received the address signal IAM (A,,, p, s), selects any vacant intra-station trunk line 22□ other than the fixed communication path F, and sends the address signal IAM
AM (Az+, P, S) is transmitted to the TSDN switch (ISW) 22 via the common channel signal path CS.

The 15DN switch (ISW) 2□ that received the address signal IAM (A2., P, S) analyzes the received address signal IAM (Az, , P, s) and determines the information channel for the packet terminal device 3□1. If it is determined that it is a request to set up a packet call using
Assemble (A2., P, S) and packet terminal device 3□
1.

The packet terminal device 321 that received the message 5ETUP CAzI, P, S) calls the I5DN exchange (I
SW)2. Response message c.

When the NN is returned, the l5DN exchange @ (ISW) 2 is sent to the packet processing unit (PH) via the common signal path CS 2.
) 21□ sends address reception completion signal and response signal ACM
/ANM and connects the packet terminal device 3□ and packet processing device (PH) 21□ to the in-office trunk line 22□.
A packet processing device that is connected via and has also received an address reception completion signal and a response signal ACM/ANM! c.
(PH)2h is connected to l5 via the common line signal path CS z.
l5 returns the address reception completion signal and response signal ACM/ANM to the DN exchange (ISW) 2□, and also receives the address reception completion signal and response signal ACM/ANM.
The DN switch (TSW) 2□ is connected to the 15DN switch (IsW) 2 via the common line signal path C34. The 15DN switch (ISW) 2+, which has returned the address reception completion signal, response signal A, and CM/ANM, and has also received the address reception completion signal and response signal ACM/ANM, processes the packet via the common line signal path C3. Equipment (PH)21. The address reception completion signal and response signal ACM/ANM are returned to the address reception completion signal and response signal ACM/ANM.

Meanwhile, the packet processing device (PH) 21. and 212, the selected vacant intra-office trunk line 22° and inter-office trunk line 4
and the intra-office trunk line 22□ is connected to the l5DN exchange II (I
SW) 2 + and 2□ to form a variable communication path C (step S5 in FIG. 3).

The packet terminal device 3□ on the calling side is the l5DN switch Nsw
) 2+ via the packet processing device (PH) 21. To,
Packet terminal equipment W3□ is connected via the information channel and is also on the called side.

is connected via an information channel to a packet processing device (PH) 21□ via an I5DN switch (ISW) 2□.

On the other hand, the packet terminal device 3 II that received the response message C0NN sends the packet processing device (PH) 21. The call request packet CR is transmitted to the call request packet CR.

The packet processing device (P) that received the CR (call request bucket)
H)21. sends a call request packet C to the packet processing device (PH) 21□ via the set variable communication path C.
The packet processing device lif (PH) 21□, which has transmitted R and received the call request packet CR, transmits the incoming call packet CN to the packet terminal device 32I via the information channel.

An incoming call acceptance packet CA is sent from the packet terminal device 3□ to the packet processing device (PH) 21□ via the information channel.
When the packet processing device (PH) 21□ returns the packet processing device (PH) 21□ via the variable communication path C, the packet processing device (PH)
(Connection completion packet CC is sent back to the connection completion packet CC)
Packet processing device (PH) 21 that received the CC. returns the connection completion packet CC to the packet terminal device 3□ via the information channel (step S3 in FIG. 3).

As a result of the above, a high-speed packet call is established between the packet terminal devices 31 and 3□1, and from now on, the packet terminal device 31 transmits data packets DT to the packet terminal device 3□1 based on the set call. to communicate.

In addition, high-speed bucket 7 between packet terminal devices 3□ and 3□1
) When the communication is completed, the packet processing device (PH) 21.
The variable communication channel C being set up between the terminal and 21□ is released by a known process.

Packet terminal device 31. While and 3□ are performing high-speed packet communication, the low-speed (for example, 1200 bits per second) packet terminal devices 3 and 2 accommodated in the I5DN switch (ISW) 2 are also performing low-speed (for example, 1200 bits per second) packet terminals. Requesting low-speed packet communication to device 3□2, send address A2□ of packet terminal device 3□2 on the called side.
, packet switching mode information P and communication speed information S (
= 1200 bits per second)
When the UP (A22, p, s) is assembled and transmitted to the ISDN switch (ISW) 21, the I5DN switch (ISW) 2. is the address signal IAM
(Ax□, P, S) is assembled and transmitted to the packet processing bag W (PH) 21° via the common line signal path C31, and the packet terminal device 31□ and the packet processing device (P
H)21. Set up an information channel between

The packet processing device (PH) 21+, which has received the address signal IAM (A2□, p, s), sends the address signal IAM (A2□, p, s) to the I5DN switch (ISW) 2.
Address reception completion signal and response signal ACM/ANM
At the same time, the communication path setting unit (Fe2) 211. Start.

The activated communication path setting unit (Fe2) 211+ analyzes the received address signal IAM (A, □, P, S),
Compare the specified communication speed information S (=1200 bits per second) with the standard value (for example, 24 kilobits per second),
The communication speed information S (=1200 bits per second) is the standard value (
= 24 kilobits per second) (Step S1 in Figure 3), the call setting for the called packet terminal device 3□2 is performed by the packet processing device (PH) 21 on the called side.
It is decided to use the fixed communication channel F that connects the
).

Currently, fixed communication channel F is packet terminal equipment 3.1 and 3□1.
Since it is not occupied for high-speed packet communication between Decide to set up the requested packet call.

On the other hand, the packet terminal device 3□1, which received the response message C0NN, sends the packet processing device (PH) 21. The call request packet CR is transmitted to the call request packet CR.

The packet processing device (P) that received the CR (call request bucket)
H) 21+ transmits the call request packet CR to the packet processing device t(PH) 21□ via the fixed communication channel F.

The packet processing device (PH) 21□ analyzes the received call request packet (CR), and if it determines that it is a request to set up a packet call to the packet terminal device 3□2, it connects it to any vacant intra-station trunk line other than the fixed communication channel F. 22□ and transmits the address signal IAM to the I5DN switch (ISW) 2° via the common line signal path CS.

l5 that received the address signal IAM (Az□, P, S)
The DN exchange (ISW) 2□ receives the received address signal I.
AM (Az□, P, S) is analyzed and the packet terminal device 3
□If it is determined that this is a request to set up a packet call using the information channel for 2, the call set-up message 5ETUP (Az
□, P, S) and transmits it to the packet terminal device 3□1.

The packet terminal device 3□2 that received the call setup message 5ETUP (A2□, P, S)
When the response message C○NN is returned to SW) 2□, the 15DN exchange (I/5W) 22 switches to the common line signal path C.
Address reception completion signal and response signal ACM/ANM are sent to the packet processing device (PH) 21□ via 32.
At the same time, the packet terminal device 3□2 and the packet processing device (PH) 21□ are connected via the in-office trunk line 22□.

The packet processing device (PH) 212, which has received the address reception completion signal and the response signal ACM/ANM, sends an incoming call packet to the packet terminal device 3□2 via the information channel.
Convey CN.

Incoming call reception bucket (CA) from the packet terminal device 3□2 to the packet processing device (PH) 21□ via the information channel
When the packet processing device (PH) 21□ returns, the packet processing device (PH) 21□ sends the packet processing device (PH) 21.
A connection completion packet CC is returned to the connection completion packet C.
The packet processing device (PH) 21 that received C. returns a connection completion packet CC to the packet terminal devices 3 and 2 via the information channel (step S3 in FIG. 3).

As a result of the above, a low-speed packet call has been set up between the packet terminal device 312 and 3□2, and from now on, the packet terminal bag W3,2 will transmit the data packet DT to the fixed communication channel F based on the set call. via packet terminal device 3
□Transfer to 2.

As is clear from the above description, according to this embodiment, when a request is made to set up a high-speed packet call from the packet terminal device 31, the communication channel setting unit (FC3) 21 in the packet processing device (PH) 21+ II compares the communication speed information S (=48 kilobits per second) specified in the call setup request with the reference value (=24 kilobits per second), and if it is determined that it exceeds the reference value, the packet processing device f (PH) 21□ without using the fixed communication channel F set up between
In order to request the setting of variable communication channel C to the 15DN exchanges (IsW) 21 and 2□ and to set up a packet call via the set variable communication channel C, fixed communication channel F is used as a low-speed packet call that is lower than the standard value. ) The variable communication channel C that is reserved for the call and set is efficiently used by high-speed communication that exceeds the reference value, and is immediately released after the communication ends. Furthermore, fixed communication channel F is used multiple times to set up packet calls below the standard value, so fixed communication channel F is also efficiently used for many low-speed packet calls, resulting in increased waiting time and communication There is no fear that time will be delayed.

Note that FIGS. 2 to 5 are only one embodiment of the present invention, and, for example, the setting of a low-speed packet call is not limited to that via an information channel, but rather via a control channel (
Although many variations can be considered in the isolocation set via the so-called D channel, the effect of the present invention remains the same in any case. Furthermore, the configuration of the integrated service digital communication network 1, which is the object of the present invention, includes two sets of I5DN exchanges (ISW).
2I and 2□, and packet processing device (PH) 21
．． and 21□, and many other variations are considered, such as being composed of a larger number of I5DN exchanges (ISW) 2 and packet processing devices (PH) 21. In either case, the effects of the present invention remain the same.

[Effects of the Invention] As described above, according to the present invention, in the integrated service digital communication network, the fixed communication channel can be used efficiently without waiting for a long time due to multiple low-speed packet calls, and the variable communication channel can be used efficiently. The route is set up only when a high-speed packet call occurs and is used efficiently, thereby improving the usage efficiency of the integrated service digital communication network and shortening the packet communication time.

[Brief explanation of drawings]

1 is a diagram illustrating the principle of the present invention, FIG. 2 is a diagram illustrating an integrated service digital communication network according to an embodiment of the present invention, and FIG. 3 is a diagram illustrating an example of the packet call setting process in FIG. 2, Figure 4 is a diagram showing an example of the high-speed packet call setup process in Figure 2, Figure 5 is a diagram showing an example of the low-speed packet call setup process in Figure 2, and Figure 6 is a diagram showing an example of the low-speed packet call setup process in Figure 2. It is a figure showing an example. In the figure, 1 is an integrated service digital communication network, 2 is an I5DN switch (ISW), 3 is a packet terminal device, and 4 is a service integrated digital communication network.
is an inter-office trunk line, and 21 is a packet processing bag! (PH), 22
is an in-office trunk line, 100 is a communication path selection means, 211 is a communication path setting unit (Fe2) 1, ? - 5 principles of the month of departure □□□ ta 1 mouth lnu 4 and sun month 1: dependent - bis 3 wa 6゛rasigital step''
Figure 2 Arrangement 21
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-*': IAI No. PK2 匡] 146-speed high-speed 81, l-Call change setting process inferiority → times 2 (1) 2 (2) Toki wo Tokiro'- Hiss consolidating system Ijitanoshi Tori (Japanese yam)

Claims (1)

[Scope of Claims] In an integrated service digital communication network (1) comprising a plurality of packet processing devices (21) connected to each other by a fixed communication path (F), each of the packet processing devices (21) is provided with settings. The communication speed of the requested packet call is analyzed, and if the communication speed is lower than a predetermined reference value, the fixed communication path (
F) is selected for the packet call setup, and if the communication speed exceeds the reference value, the variable communication path for the packet call (C
1.) A packet switching line selection system characterized by comprising a communication path selection means (100) for requesting the integrated service digital communication network (1) to set up the integrated service digital communication network (1).