JPH06125360A - Incoming call channel election system - Google Patents

Abstract

PURPOSE:To improve the information transfer efficiency by selecting a channel in matching with a channel selected for use by a sender side from the standpoint of information transfer capability when a called channel is selected so as to allow the information transfer capability of both channels to enhance completely. CONSTITUTION:A caller channel information transfer means 201 adds identification information of a transmission channel decided for use between a caller terminal equipment 100 and an exchange 200 at setup to a caller request packet and a called terminal equipment 300 transfers the result to a caller exchange 400 accommodating a called terminal equipment 300. When a called channel discrimination means 401 decides a called channel used with the called terminal equipment 300, the identification information of the caller channel transferred from the caller exchange 200 is referenced to decide the called channel satisfying the information transfer capability of the transmission channel. Thus, when the called channel is selected, the channel in matching with the channel selected for use at the caller side from the standpoint of the information transfer capability is selected, the information transfer capability of both channels is completely enhanced and the information transfer efficiency of an integrated services digital network is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an incoming channel selection system in a service integrated digital network having a packet switching function.

In the International Telegraph and Telephone Consultative Committee (CCITT), the integrated services digital network (so-called ISDN)
As a method of realizing packet communication in, the ISDN does not have a packet processing function and the ISDN connects a packet terminal accommodated to an existing packet switching network to provide a packet switching service, and a packet processing function for the ISDN. Is provided to provide the packet switching service to the accommodated packet terminal and to connect to the existing packet switching network.

The present invention is based on the above-mentioned Case B, ISD.
N is targeted.

[0004]

2. Description of the Related Art FIG. 8 is a diagram showing an example of a conventional service integrated digital network, FIG. 9 is a diagram showing an example of a call setting process in FIG. 8, and FIG. 10 is an example of a channel type determination principle. FIG. 11 is a diagram showing an example of packet transfer capabilities of the B channel and the D channel.

In FIG. 8, a packet processing unit (PH)
An ISDN exchange (IS) 1 including 11 provides a packet exchange service to a packet terminal (PT) 3 accommodated via a terminal adapter (TA) 2.

The individual ISDN exchanges (IS) are referred to as 1 ₁ , 1 _2, etc. The same applies below. 8 and 9, the packet terminal (PT) 3 ₁ accommodated in the ISDN exchange (IS) 1 ₁ performs a packet terminal (PT) 3 ₂ packet communication to be accommodated in the ISDN exchange (IS) 1 ₂ Therefore, from the terminal adapter (TA) 2 ₁ to ISD
Call setup message SETUP to the N switch (IS) 1 _1.
(C ₁ ) is transferred.

In the call setup message SETUP (c ₁ ), the packet terminal (PT) 3 ₁ is sent to the ISDN exchange (I
S) A transmission channel type (c ₁ ) designating a channel desired to be used for packet communication with 1 ₁ is included as a channel identifier information element.

The transmission channel type (c ₁ ) is, as shown in FIG. 10, B channel display, channel change designation and D channel display.
It consists of channel displays. Call setup message S
ISDN exchange (IS) 1 that received ETUP (c ₁ )
₁ analyzes the originating channel type (c ₁ ) included in the call setup message SETUP (c ₁ ) according to the principle shown in FIG. 10, and selects the packet terminal (PT) 3 ₁ from among the channels permitted to be designated. A channel to be used between the packet processing unit (PH) 11 ₁ and the packet processing unit (PH) 11 ₁ is determined, and a call setting acceptance message CALL PRO including a transmission channel type (c ₁ ′) indicating the determined channel as a channel identifier information element.
C (c ₁ ′) is returned to the terminal adapter (TA) 2 ₁ .

Thereafter, the packet terminal (PT) 3₁Is set
Packet processing of SABM frames via the reserved channel.
Science Department (PH) 11₁Packet processing unit (PH)
11 ₁When the UA frame returned from the
Terminal (PT) 3₂To set up a call between
The request packet CR is sent to the packet processing unit (PH) 11₁Turn to
To send.

The packet processing unit (PH) 11 ₁ has a calling request packet C transferred from the packet terminal (PT) 3 _1.
R is transferred to the ISDN exchange (IS) 1 ₂ accommodating the packet terminal (PT) 3 ₂ .

At this time, the call request packet CR transferred to the ISDN exchange (IS) 1 ₂ includes a packet terminal (P
T) 3 ₁ It does not include information on the transmission channel type (c ₁ ′) decided to be used.

[0012] ISDN exchange (IS) 1 ₁ transfers the call request packet CR from the ISDN exchange (IS) 1 ₂
The terminal sends a call setup message SETUP (c ₂ ) including, as a channel identification call information element, an incoming channel type (c ₂ ) designating a channel desired to be used for packet communication with the packet terminal (PT) 3 _2. Transfer to adapter (TA) 2 ₂ .

Call setup message SETUP (c₂) Received
Trusted terminal adapter (TA) 2₂Is the call setup message.
Sage SETUP (c₂Incoming channel type included in
(C ₂) Is analyzed by the principle shown in FIG.
Channel to be used from among the channels that can be specified.
Incoming channel that determines one channel and indicates the determined channel
Type (c₂') As a channel identifier information element.
Answer message CONN (c₂′) Is an ISDN switch
(IS) 1₂Return to.

The ISDN exchange (IS) 1 _{2, which} has returned the response message CONN (c ₂ ′), sends the response confirmation message CONN AC to the terminal adapter (TA) 2 _2.
After returning K, the packet processing unit (PH) 11 ₁ transfers the SABM frame to the packet terminal (PT) 3 ₂ via the set channel, and the packet terminal (PT) 3
Upon receipt of the UA frame sent back from ₂ transfers to request a call setup between the packet terminal (PT) 3 _2, the incoming call packet CN packet terminal (PT) 3 _2, packet terminal (PT ) When the incoming call acceptance packet CA is returned from 3 ₂ , the incoming call acceptance packet CA is transferred to the packet processing unit (PH) 11 ₁ .

Upon receiving the incoming call acceptance packet CA, the packet processing unit (PH) 11 ₁ returns the connection completion packet CC to the packet terminal (PT) 3 ₁ . From the above,
A call for packet communication is set up between the packet terminals (PT) 3 ₁ and 3 ₂ .

Thereafter, the packet terminals (PT) 3 ₁ and 3 ₂ pass the data packet DT via the set channel.
To transfer. Here, packet terminal (PT) 3 ₁ and the packet processing unit (PH) originating channel determined used between the 11 _1, and packet terminal (PT) 3 ₁ and the packet processing unit (PH) between 11 ₁ Depending on whether the incoming channel decided to be used is the B channel and D channel of the basic interface (BRI) or the B channel and D channel of the primary group interface (PRI),
As shown in 11, the line speed and the maximum packet length are different.

Therefore, if the outgoing channel type (c ₁ ′) and the incoming channel type (c ₂ ′) match, the information transfer capability of both channels is fully utilized. For example, the outgoing channel type (c _{If 1} ') is the B channel of the basic interface and the incoming channel type (c ₂ ') is the D channel of the basic interface, the outgoing channel has a line speed of 64 kilobits per second and a maximum packet length of 4096. Despite being an octet, the line speed of the incoming channel (16 kilobits per second) and the maximum packet length (256 octets) must be used only, and the information transfer capability of the outgoing channel cannot be fully utilized.

[0018]

As is apparent from the above description, in the conventional integrated service digital network, the incoming channel is determined independently of the outgoing channel, so that the communication capabilities of both channels cannot be matched. There is a possibility that the information transfer capability of either channel cannot be fully utilized.

It is an object of the present invention to make it possible to select a channel that can make full use of the information transfer capabilities of an outgoing channel and an incoming channel as much as possible.

[0020]

FIG. 1 is a diagram showing the principle of the present invention. In FIG. 1, 100 is a calling terminal, and 300 is
Is a called terminal, 200 is a calling side exchange that accommodates the calling terminal 100, and 400 is a called side exchange that accommodates the called terminal 300, and is a comprehensive service digital network equipped with a packet switching function conforming to the Case B system according to CCITT recommendation. Configure the net.

Reference numeral 201 designates the exchange 2 on the originating side according to the present invention.
00 is a transmission channel information transfer means. Four
Reference numeral 01 is an incoming channel determination means provided in the exchange 400 on the incoming side according to the present invention.

[0022]

The transmission channel information transfer means 201 adds the identification information of the transmission channel, which is determined to be used between the transmission terminal 100 and the exchange 200 at the time of call setup, to the transmission request packet.
The data is transferred to the exchange 400 on the receiving side that accommodates the receiving terminal 300.

The incoming channel determining means 401 determines the incoming channel to be used with the incoming terminal 300.
By referring to the identification information of the outgoing channel transferred from the exchange 200 on the outgoing side, the incoming channel satisfying the information transfer capability of the outgoing channel is determined.

Therefore, when the channel of the receiving side is selected, the channel which has the consistency in information transfer capability with the channel already selected for use on the transmitting side is selected, and the information transfer capability of both channels is selected. It can be fully utilized and the information transfer efficiency of the service integrated digital network is improved.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 2 is a diagram showing a service integrated digital network according to an embodiment of the present invention, FIG. 3 is a diagram showing an example of the originating side process in FIG. 2, and FIG. 4 is an example of a destination side process in FIG. 5 is a diagram showing an example of incoming channel selection criteria in FIG. 2, FIG. 6 is a diagram showing an example of a call setting process in FIG. 2, and FIG. 7 is an example of the present invention. FIG. 5 is a diagram showing a call request packet according to FIG. The same reference numerals denote the same objects throughout the drawings. The principle of determining the channel type is as shown in FIG. 10, and the packet transfer capabilities of the B channel and D channel are as shown in FIG.

In FIG. 2, the transmitting terminal 1 in FIG.
Packet terminal (PT) 3 as 00 ₁And terminal
Adapter (TA) 2₁Is provided and the wear in FIG.
Packet terminal (PT) 3 as the communication terminal 300₂And
-Terminal adapter (TA) 2 ₂Is provided, and also in FIG.
The ISDN exchange (I
S) 1₁And the exchange on the receiving side in FIG.
ISDN exchange (IS) 1 as 400₂Is provided,
Also, as the transmission channel information transfer means 201 in FIG.
Transmission channel information storage unit 12₁And outgoing channel information
Information transfer unit 13₁ISDN Exchange (IS) 1₁Provided inside
And the main memory (MM) 14₁Stored in
The call control memory (CDB) stored in the
Is (s ₁), Outgoing channel type (c₁) And outgoing
Interface type (i₁) Outgoing channel information consisting of
(SCI) is stored, and the incoming call
The transmission channel information storage unit 1 as the channel determination unit 401
5₂And incoming channel determination unit 16₂ISDN exchange
(IS) 1₂Main storage device provided inside
(MM) 14₂Call control memory (CD
Transmission channel information (SCI) is stored in B).

2 to 7, the packet terminal (PT) 3 accommodated in the ISDN exchange (IS) 1 _{1.
In order for 1} to perform packet communication with the packet terminal (PT) 3 ₂ accommodated in the ISDN exchange (IS) 1 ₂ , the terminal adapter (TA) 2 ₁ to the ISDN exchange (IS)
1 _1, call setup comprising transmitting channel type packet terminal (PT) 3 ₁ is to specify the desired channel the use packet communication between the ISDN exchange (IS) 1 ₁ a (c ₁₎ as a channel identifier information element Message SETUP
(C ₁ ) is transferred.

The call setup message SETUP (c ₁₎ ISDN exchange which receives the (IS) 1 ₁ is (FIG. 3 step S
31), similar to the above, call setup message SETUP
Analyzing the outgoing channel type (c ₁₎ included in (c _1), set between among channels allowed the designation, packet terminal (PT) 3 ₁ and the packet processing unit and (PH) 11 ₁ A call setting acceptance message CALL PROC that selects one channel and includes a transmission channel type (c ₁ ′) indicating the selected channel as a channel identifier information element
(C ₁ ′) is returned to the terminal adapter (TA) 2 ₁ .

Further outgoing channel information storage section 12 ₁ of the ISDN exchange (IS) 1 _1, the call setting message SET
The originating channel type (c ₁ ) is extracted from the channel identifier information element of UP (c ₁ ) and the ISDN exchange (IS) is also used.
1 originating interface type from a pre-Defined unexpected illustrated subscriber interface information in ₁ (i ₁₎ extracting the main storage to the calling from the terminal adapter _{(TA) 2 1 (MM)} 14 1 The data is stored in the call control memory (CDB) set in (step S32).

Thereafter, the packet terminal (PT) 3₁Is set
Packet processing of SABM frames via the reserved channel.
Science Department (PH) 11₁Packet processing unit (PH)
11 ₁When the UA frame returned from the
Terminal (PT) 3₂To request a call setup between
Call request packet CR (s₁) Is a packet processing unit (P
H) 11₁Transfer to.

The call request packet CR (s ₁ ) contains
The outgoing packet size (s ₁ ) desired by the packet terminal (PT) 3 ₁ is included. Outgoing channel information storage unit 1
2 ₁ is the transmission packet size (s) from the call request packet CR (s ₁ ) transferred from the packet terminal (PT) 3 _1.
1 ) is extracted and stored in the call control memory (CDB) in the main memory (MM) 14 ₁ (step S32).

As described above, in the call control memory (CDB), three kinds of information of the outgoing packet size (s ₁ ), the outgoing channel type (c ₁ ) and the outgoing interface type (i ₁ ) are stored in the outgoing channel information ( It will be stored as SCI).

On the other hand, the transmission channel information transfer unit 13 ₁
Call control memory (CDB) in main memory (MM) 14 ₁
The transmission channel information (SCI) already stored in
As shown in, the call request packet CR transferred from the packet terminal (PT) 3 ₁ includes a non-standard NUF (Network).
User Facility) (step S3)
3).

The packet processing unit (PH) 11 ₁ is a calling request packet CR to which outgoing channel information (SCI) is added.
(SCI) is an I that accommodates the packet terminal (PT) 3 _2.
Transfer to the SDN exchange (IS) 1 ₂ (step S3
4).

The ISDN exchange (IS) 1 ₂ is an ISDN
Call is forwarded from the exchange (IS) 1 ₁ Request packet C
When R (SCI) is received (step S41 in FIG. 4), the originating channel information storage unit 15 ₂ extracts the originating channel information (SCI) from the received call request packet CR (SCI), and the ISDN exchange (IS) 1 ₁ In response to an incoming call from, the call is stored in the call control memory (CDB) set in the main memory device (MM) 14 ₂ (step S42).

Subsequently, the incoming channel determination unit 16 ₂ specifies the channel desired to be used for packet communication with the packet terminal (PT) 3 ₂ when the main memory device (MM) 1
The transmission channel information (SCI) is extracted from the corresponding call control memory (CDB) in 4 ₂ and the transmission channel information (SC
Select a channel that satisfies I).

Here, the incoming channel determination unit 16 ₂ selects an incoming channel that can be selected for the given outgoing channel information (SCI) based on the criteria shown in FIG. In FIG. 5, for example, transmission channel information (SCI)
If the outgoing interface type (i ₁ ) is specified as the basic interface, the outgoing channel type (c ₁ ) is the B channel, and the outgoing packet size (s ₁ ) is 256 octets or less, the selectable incoming channel is B channel in the basic interface indicated by ○,
The incoming channels, which are the B channel and D channel in the primary interface, and which can be selected if the communication speed is limited to 16 kilobits per second, are the D channels in the basic interface indicated by the triangle marks.

As the outgoing channel information (SCI), the outgoing interface type (i ₁ ) is designated as the primary group interface, the outgoing channel type (c ₁ ) is B channel, and the outgoing packet size (s ₁ ) is 512 octets or less. In this case, the selectable incoming channels are the B channel in the basic interface indicated by a circle and the B channel in the primary group interface, and the D channel in the basic interface indicated by a cross and 1 channel.
The D channel in the next group interface cannot be selected because the allowable packet size is 256 octets or less, and the call setup message SETUP (c ₂ ) cannot be selected.
The incoming channel type (c ₂ ) in D channel display is set to “none”.

Similarly, the incoming channel determination unit 16
₂ selects the channel corresponding to the circle mark in FIG. 5 as the incoming channel type (c ₂ ) for the outgoing channel information (SCI) extracted from the call control memory (CDB),
Incoming channel type of the selected channel (c _2), is set as the channel identifier information element in the call setting message SETUP to transfer to the terminal adapter (TA) ₂ 2 (step S43), terminal adapter (TA) 2 ₂
(Step S44).

Call setup message SETUP (c₂) Received
Trusted terminal adapter (TA) 2₂Is the call setup message.
Sage SETUP (c₂Incoming channel type included in
(C ₂) From the channels that are allowed to be specified
Determine one channel to use and show the determined channel.
Incoming channel type (c₂′) Is required for channel identifier information
Response message CONN (c₂′) To I
SDN exchange (IS) 1₂Return to.

The ISDN exchange (IS) 1 _{2, which} has returned the response message CONN (c ₂ ′), sends the response confirmation message CONN AC to the terminal adapter (TA) 2 _2.
After returning K, the SABM frame is transferred from the packet processing unit (PH) 11 ₁ to the packet terminal (PT) 3 ₂ via the set channel, and the packet terminal (PT) 3
Upon receipt of the UA frame sent back from ₂ transfers to request a call setup between the packet terminal (PT) 3 _2, the incoming call packet CN packet terminal (PT) 3 _2, packet terminal (PT ) When the incoming call acceptance packet CA is returned from 3 ₂ , the incoming call acceptance packet CA is transferred to the packet processing unit (PH) 11 ₁ .

Upon receiving the incoming call acceptance packet CA, the packet processing unit (PH) 11 ₁ returns the connection completion packet CC to the packet terminal (PT) 3 ₁ . From the above,
A call for packet communication is set up between the packet terminals (PT) 3 ₁ and 3 ₂ .

Thereafter, the packet terminal (PT) 3₁And 3₂When
Data packet DT via the set channel
To transfer. As is clear from the above description, this embodiment
According to ISDN exchange (IS) 1 ₂Is a packet terminal
(PT) 3₂The channel used between
Exchange (IS) 1₁Call request packet CR transferred from
Calling channel information set in (SCI) (SC
Packet terminal (PT) to select I)
Three ₁And ISDN exchange (IS) 1₁Decided to use between
Communication capability of the outgoing channel
Three₂And ISDN exchange (IS) 1₂Decided to use between
And the information transfer capability of the incoming channel
And the information transfer capacity of both channels can be fully utilized.
It

2 to 7 are merely embodiments of the present invention. For example, the configurations of the exchange 200 on the originating side and the exchange 400 on the receiving side are ISDN exchanges (IS) 1 ₁ and 1 shown. _The present invention is not limited to ₂ , and many other modifications can be considered, but the effect of the present invention does not change in any case.

[0045]

As described above, according to the present invention, in the service integrated digital network, when the channel of the receiving side is selected, there is consistency in the information transfer capability with the channel already selected for use by the transmitting side. The channel will be selected,
The information transfer capability of both channels can be fully exerted, and the information transfer efficiency of the service integrated digital network is improved.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a service integrated digital network according to an embodiment of the present invention.

FIG. 3 is a diagram showing an example of processing on the originating side in FIG.

FIG. 4 is a diagram showing an example of processing on the receiving side in FIG.

5 is a diagram showing an example of incoming channel selection criteria in FIG. 2;

FIG. 6 is a diagram showing an example of a call setting process in FIG.

FIG. 7 is a diagram showing a call request packet according to an embodiment of the present invention.

FIG. 8 is a diagram showing an example of a conventional service integrated digital network.

9 is a diagram showing an example of a call setting process in FIG.

FIG. 10 is a diagram showing an example of a channel type determination principle.

FIG. 11 is a diagram showing an example of packet transfer capabilities of a B channel and a D channel.

[Explanation of symbols]

 1 ISDN Switch (IS) 2 Terminal Adapter (TA) 3 Packet Terminal (PT) 11 Packet Processing Unit (PH) 12 Outgoing Channel Information Storage Unit 13 Outgoing Channel Information Transfer Unit 14 Main Storage Device (MM) 15 Outgoing Channel Information Storage Unit 16 Incoming channel determination unit 100 Outgoing terminal 200 Outgoing side exchange 201 Outgoing channel information transfer means 300 Incoming terminal 400 Incoming side exchange 401 Incoming channel determination means

Claims (1)

[Claims] 1. In a service integrated digital network having a packet switching function conforming to the Case B system according to the CCITT recommendation, a switching system (20) for a calling side which accommodates a calling terminal (100).
0) at the time of call setup, the calling terminal (100) and the exchange (20)
0) is added to the calling request packet with the identification information of the calling channel that has been decided to be used, and a calling channel information transfer means (201) for transferring to the called exchange (400) accommodating the called terminal (300). The exchange (400) on the receiving side is provided with the receiving terminal (30
0), when determining the incoming channel to be used with the incoming channel, refer to the identification information of the outgoing channel transferred from the exchange (200) on the outgoing side, and the incoming channel satisfying the information transfer capability of the outgoing channel. An incoming channel selection method, characterized in that an incoming channel determination means (401) for selecting is provided.