JPH06177934A - Isdn terminal equipment - Google Patents

Abstract

PURPOSE:To allow a user to enjoy plural communication services even in the case of a communication terminal equipment able to support only one terminal equipment end point identifier by starting a communication terminal equipment identifier procedure every type the kind of communication service is revised and making the terminal equipment end point identifier in use corresponding to the type of the revised communication service. CONSTITUTION:A terminal equipment TE sends an ID request message to a network to acquire an ID (terminal equipment end point identifier TEI). Upon the receipt of an ID allocation message from the network on the other hand, a data link is set by a procedure of a non-automatic TEI allocation synchronization extension balanced mode setting (SABME) frame and a non-number TEI acknowledge (UA) frame. Then a communication control section of the TE starts a terminal equipment identification (SPID) procedure and sends an INFO message. An SPID-ID is added to the message and used for identifying the terminal equipment TE. When the TE supports plural kinds of services, the ID (TEI) acquisition procedure is executed for plural number of times for each communication service to identify the TE.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ISDN terminal device, and in particular to an IS capable of supporting a plurality of types of communication services such as G4 communication, G2 / G3 communication or TEL communication.
The present invention relates to a DN terminal device.

[0002]

2. Description of the Related Art Conventionally, integrated service digital network (ISD)
N: Integrated Services Digital Network) ISDN terminal devices that are connected to each other and perform digital communication with each other are widely used. Various signals are exchanged between the ISDN user and the network in order to set or release communication, and is defined as a user-network protocol. This ISDN user-network protocol is OSI
(Open System Interconnection) Layers are divided into layers 1 to 3 based on the reference model. Above all, layer 2
Is commonly known as D channel link access procedure (LAP
D: Link Access Procedure on the D-channel), which has a function of overcoming a transmission error or the like in a frame unit of information between a user and a network to perform highly reliable signal transfer.

In the basic interface, in order to ensure portability that a certain terminal equipment (TE) can be used anywhere, each terminal equipment has a terminal termination point identifier (T).
An EI (Terminal Endpoint Identifier) is assigned. That is, this TEI value is not registered in the network in advance, but when the need arises, the TEI value is assigned according to a predetermined procedure.

However, even if the ISDN terminal device can support a plurality of types of communication services, if the terminal device (TE) can use only one TEI, a plurality of communication services cannot be received. there were. That is, one T for one service
This is because there are networks to which EIs must be assigned, and if there are multiple communication services to be used, it is necessary to support multiple TEIs accordingly.

Further, some exchanges can provide a plurality of communication services for one TEI, but it cannot be said that all exchanges can always provide the communication services. Therefore, CCITT Recommendation Q.20 executed by sending and receiving an INFO message consisting of a specific bit pattern between TE (terminal device) and NT (network terminating device). As an optional procedure of 932, SPID (Service Profile IDentifica) called "terminal identification procedure" or "terminal initialization procedure" is called.
tion) There are procedures. Then, in this SPID procedure, the TE notifies the network of the SPID value designated by the subscription, so that the network exists in the TE.
It was used to recognize various TSPs (Terminal Service Profiles) and provide various communication services.

[0006]

As described above, in the conventional ISDN terminal device, there is an exchange that enables a plurality of communication services for one TEI, but one for one service. There are also exchanges that have to allocate one TEI. Therefore, the ISDN terminal device must support a plurality of TEIs corresponding to the number of communication services in order to always be able to use the plurality of communication services without being influenced by the exchange. .

In addition, in a normal terminal device, one TEI is used.
For example, ISDN-G3
In the case of a communication terminal that supports both communication and ISDN-G4 communication, there is a problem that only one communication service can be received. The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide an ISDN terminal device that can enjoy a plurality of communication services even if the communication terminal can support only one TEI. .

[0008]

The invention according to claim 1 is
Supports multiple types of communication services
Q. of TT recommendation 932-compliant terminal identification procedure (SPI
D procedure) is performed and one terminal termination point identifier (TE
I) In the ISDN terminal device which can be used only, a terminal identification procedure starting means for starting the terminal identification procedure every time the type of the communication service is changed, and a value of the terminal termination point identifier being used by the terminal identification procedure. And terminal terminating point identifier changing means for making the communication service type after the change,
Is provided, and one terminal termination point identifier can support a plurality of types of communication services.

The invention according to claim 2 is compatible with a plurality of types of communication services, and the Q. 9
In the ISDN terminal device capable of performing the terminal identification procedure (SPID procedure) conforming to 32 and using only one terminal termination point identifier (TEI), the data link (D channel layer) is changed every time the type of the communication service is changed. 2) Data link releasing means for releasing the terminal end point identifier releasing means for temporarily releasing the terminal end point identifier being used, terminal end point identifier acquiring means for acquiring the terminal end point identifier again, and terminal identifying procedure ( SPID procedure) activating terminal identification procedure activating means, and terminal terminating point identifier changing means for making the value of the terminal terminating point identifier correspond to the changed communication service type. It is characterized in that it can support various types of communication services.

The invention according to claim 3 is the invention according to claim 1 or 2.
It is characterized in that the described ISDN terminal device can be arbitrarily selected by setting by the user.

[0011]

In the invention described in claims 1 and 2, one TE is used.
Even if the terminal device can only support I, the communication terminal identification procedure is activated every time the communication service type is changed, and the terminal termination point being used for the communication service type changed by the terminal termination point identifier corresponding means. A communication terminal identification procedure in which the data link is released each time an identifier is associated or the type of communication service is changed, the terminal end point identifier in use is temporarily released, and then the terminal end point identifier is acquired again Since the communication terminal identification procedure is activated by the activation means, a plurality of communication services can be received.

Further, in the invention according to claim 3, since the above-mentioned claim 1 or claim 2 can be arbitrarily selected by the setting of the user, the setting can be freely changed according to the situation.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. First, the configuration will be described. FIG. 1 shows an I according to an embodiment of the present invention.
It is a block diagram which shows the structure of an SDN terminal device.

In the figure, 1 is a system controller (SC
U: System Control Unit) controls the entire ISDN terminal device. A storage unit 2 stores transmission / reception data, parameters relating to system control, and the like. An input unit 3 is a scanner or the like that reads transmission originals and creates transmission data.

An output unit 4 is a plotter or the like for recording and outputting the received data on recording paper or the like. Reference numeral 5 denotes an operation port unit, which is a keyboard for operating the system control by the user and L for notifying the user of a predetermined message.
It is equipped with a display such as a CD.

Reference numeral 6 is a communication control unit (CCU: Communication)
Control Unit) controls communication between ISDN terminals via ISDN (Integrated Services Digital Network). 7 is a line terminating device (DSU: Digital Service Uni)
At t), the digital signal transmitted / received by the terminal device and the digital signal suitable for the transmission path are converted. A bus 8 is connected to the respective parts of the ISDN terminal device and is mutually accessible.

FIG. 2 is a block diagram showing a configuration example of the communication control unit of FIG. 1 which plays a central role for realizing the present invention. In the figure, the communication control unit (CCU) 6 has a D
It has a -ch call control unit 9 and a B-ch control unit 10,
The D-ch call control unit 9 provides a physical / electrical interface for connecting to the ISDN D-ch call control (layer 1 to layer 3) and ISDN. The B-ch control unit 10 controls ISDN B-ch communication such as G4 communication, G3 communication, or TEL communication.

FIG. 3 is a block diagram showing a detailed configuration example of the D-ch call control unit in FIG. In the figure, the D-ch call control unit 9 has a layer 3 control unit 11, a management entity 12, a layer 2 control unit 13, and a layer 1 control unit 14, and the layer 3 control unit 11 is a D-ch.
Controls the layer 3 and manages the management entity 12
Monitor the entire D-ch control unit 9, manage the call number, and TEI.
Management, and the layer 2 control unit 13 controls the D-ch layer 2
The layer 1 control unit 14 controls the D-ch layer 1. The present invention is realized by the management entity 12 activating the SPID procedure to manage the TEI value, and here is the case of managing only one TEI.

Next, the operation will be described below with reference to FIGS. FIG. 4 is a diagram showing a basic message flow when the SPID procedure according to the embodiment of the present invention is used, and FIGS. 5 and 6 are diagrams showing an example of a message format used in the SPID procedure. 7 is a diagram showing a message flow of a communication procedure according to an embodiment of claim 1, and FIG. 8 is a diagram showing a message flow of a communication procedure according to an embodiment of claim 2.

First, as shown in FIG. 4, the terminal equipment (TE) transmits an ID request message to the network in order to acquire the ID (TEI). On the other hand, when an ID allocation message is received from the network, a non-automatic TEI allocation synchronization extended balanced mode setting (SABME: Set Asynchrono
A data link is set up by the procedure of a us Balanced Mode Extended) frame and an Unnumbered Acknowledge (UA) frame.

When the data link is set up in this way, the terminal equipment (TE) activates the SPID procedure and sends an INFO message to the network. SPID-ID is added to the message at this time, and the network sends this I
The terminal device is uniquely identified by D. Also, if the TE supports multiple services (here, IS
This shows the case where the DN-G4 communication and the ISDN-G3 communication are supported), and T is set for each communication service.
Since it is necessary to acquire EI, as shown in FIG.
The D (TEI) acquisition procedure is performed twice. That is,
64 is assigned as the TEI value in the case of ISDN-G4 communication, and 67 is assigned as the TEI value in the case of ISDN-G3 communication.

Next, as for the message format of the command from the user terminal to the network used in the SPID procedure, as shown in FIG. 5, the INFO message having the dummy call number includes the SPID information element. Also, SPID
As shown in FIG. 6, the message format from the network to the user terminal used in the procedure includes an EID information element and an IRQ information element in an INFO message having a dummy call number. Of course, the INFO message may include other information elements, which are network dependent.

Next, as shown in FIG. 7, in the case of claim 1, the TE assigned in the portion (1) in the drawing is assigned.
The I value is managed in correspondence with G4 communication. At this time, if a communication request for a different service type (for example, G3 communication) is generated, the SPI is re-executed in the portion indicated by (2) in the figure.
D procedure is activated, and TEI assigned in part (1)
The value is reset for G3 in part (2).

Further, as shown in FIG. 8, in the case of claim 2, in the portion indicated by (1) in the figure, the assigned TEI value is managed in correspondence with G4 communication. At this time, if a communication request for a different service type (for example, G3 communication) is generated, the link is released at the portion indicated by (2) in the figure, the TEI value is acquired again, and then the SPID procedure is activated. The TEI value corresponding to a new communication service (for example, G3 communication). At this time, the TEI value acquired in (1) in the figure is canceled inside the terminal.

[0025]

As described above, according to the first and second aspects of the invention, even if the communication terminal can support only one TEI, the communication terminal identification procedure is performed every time the communication service type is changed. It is activated and the terminal end point identifier in use is made to correspond to the type of communication service changed by the terminal end point identifier corresponding means, or the data link is released every time the type of communication service is changed,
Since the terminal end point identifier being used is temporarily released, the terminal end point identifier is acquired again and the communication terminal identification procedure starting means starts the communication terminal identification procedure, so that a plurality of communication services can be received. This makes it possible to perform the same communication as when connected to a network that does not require the SPID procedure.

Further, according to the invention of claim 3, the claim 1 or claim 2 can be arbitrarily selected by the setting of the user. Therefore, the setting can be made according to the situation while maintaining the above-mentioned effect. I can change it.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an ISDN terminal device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration example of a communication control unit in FIG.

FIG. 3 is a block diagram showing a detailed configuration example of a D-ch call control unit in FIG.

FIG. 4 is a diagram showing a basic message flow when the SPID procedure according to an embodiment of the present invention is used.

FIG. 5 is a diagram showing an example of a message format used in the SPID procedure.

FIG. 6 is a diagram showing an example of a message format used in the SPID procedure.

FIG. 7 is a diagram showing a message flow of a communication procedure according to an embodiment of claim 1;

FIG. 8 is a diagram showing a message flow of a communication procedure according to an embodiment of claim 2;

[Explanation of symbols]

 1 system control unit 2 storage unit 3 input unit 4 output unit 5 operation port unit 6 communication control unit (CCU) 7 line terminating device (DSU) 9 D-ch call control unit 10 B-ch control unit 11 layer 3 control unit 12 Management entity 13 Layer 2 control unit 14 Layer 1 control unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location 8220-5K H04L 13/00 309A

Claims (3)

[Claims] 1. It is possible to support a plurality of types of communication services, and Q. In an ISDN terminal device that can perform a terminal identification procedure (SPID procedure) conforming to 932 and can use only one terminal termination point identifier (TEI), the terminal identification procedure is started every time the type of the communication service is changed. And a terminal terminating point identifier changing means for making the value of the terminal terminating point identifier in use by the terminal identifying procedure correspond to the communication service type after the change, one terminal terminating point is provided. An ISDN terminal device characterized by being able to support a plurality of types of communication services with an identifier. 2. It is possible to support a plurality of types of communication services, and Q. In the ISDN terminal device that can perform the terminal identification procedure (SPID procedure) conforming to 932 and can use only one terminal termination point identifier (TEI), the data link (D channel layer) is changed every time the type of the communication service is changed. 2) a data link releasing means, a terminal terminal point identifier releasing means for temporarily releasing a terminal terminal point identifier being used, a terminal terminal point identifier acquiring means for acquiring a terminal terminal point identifier again, and a terminal identifying procedure ( SPID procedure) activating terminal identification procedure activating means, and terminal terminating point identifier changing means for making the value of the terminal terminating point identifier correspond to the changed communication service type, a plurality of terminal terminating point identifiers are provided. An ISDN terminal device characterized by being able to support a type of communication service. 3. An ISDN terminal device according to claim 1 or 2, wherein the ISDN terminal device can be arbitrarily selected by setting by a user.