JPH06132956A - Isdn packet terminal selector - Google Patents

Abstract

PURPOSE:To transmit the data by means of an inexpensive long packet by securing preferentially the connection to a B-channel packet terminal in the value of the packet size information element shown in an incoming call setting message. CONSTITUTION:The circuit interface parts 34 and 35 are provided together with an ISDN processing part 36, and a terminal selection processing part 37. These parts are connected between an ISDN network 31 and the terminals 33a-33d set in a point/multipoint form of the ISDN packet exchange. Then the connection is preferentially secured to a B-channel packet terminal in an incoming state from the network 31 and with use of a long packet having the value large than 256 octet in terms the packet size information element shown in a call setting message.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in an ISDN packet communication system and selects an ISDN packet terminal for preferentially connecting a B channel packet terminal according to the value of a packet size information element indicated in a call setup message of an incoming call. Regarding the device.

[0002]

2. Description of the Related Art FIG. 4 shows a point / multipoint connection form between a conventional communication network and a plurality of terminals. In FIG. 4, in this point / multipoint connection mode,
It has terminals 1 and 2 for D channel packet processing, terminals 3 and 4 for B channel packet processing, and an ISDN network 5 to which these terminals 1 to 4 are connected.

FIG. 5 shows a sequence diagram of an operation in such a point / multipoint connection mode. In FIG. 4 and FIG. 5, the call setting is performed when there is an incoming call requesting packet switching from the ISDN network 5. After this, the terminals 1 to 4 send the response messages [A],
[B], [C], and [D] are returned. The ISDN network 5 connects the packet call to the terminal 1 which first returned the response message [A]. The call is released to the other terminals 2 to 4 by the release message.

[0004]

However, in the conventional packet switching termination procedure, the value of the packet size information element indicated in the call setup message from the ISDN network 5 is larger than 256 octets (hereinafter referred to as a long packet. Even in the case of the above), the packet size is negotiated to be 256 octets or less (hereinafter referred to as a short packet) when the terminal of the D channel packet first returns a response message. Therefore, there is a drawback that data transmission is performed in short packets whose communication charges are relatively high.

The present invention solves such a conventional problem, and can preferentially connect to a B channel packet terminal according to the value of the packet size information element shown in the call setup message of an incoming call, and a low charge. It is an object of the present invention to provide an excellent ISDN packet terminal selection device capable of transmitting data in long packets.

[0006]

In order to achieve this object, the present invention is connected between a B channel packet terminal, a D channel packet terminal and an ISDN network in a point / multipoint mode of ISDN packet switching. An ISDN packet terminal selection device according to claim 1, which comprises an ISDN processing means and a terminal selection processing means, and a long packet in which the value of the packet size information element shown in the call setup message is larger than 256 octets when receiving from the ISDN network. In this case, the B channel packet terminal is configured to be preferentially connected.

[0007]

In the ISDN packet terminal selection device of the present invention having such a configuration, when the value of the packet size information element indicated in the call setup message from the network is a long packet, a plurality of B channel packet terminals, D Referring to the channel identifier of the response message from the channel packet terminal, determining the B channel packet terminal and selecting it with priority,
Make a call connection. That is, data transmission is performed in long packets with low charges.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an ISDN packet terminal selection device of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the ISDN packet terminal selection device of the present invention.
In FIG. 1, the ISDN packet terminal selection device is
ISDN network 31, terminal selection device 32 connected to this ISDN network 31 by an I interface, and packet terminals 33a, 33b, 33 connected to this terminal selection device 32.
c, 33d.

The packet terminals 33a and 33b are
Channel packet terminal, packet terminal 33c, 33d
Is a B channel packet terminal.

The terminal selection device 32 is provided with a line interface unit 34 and a line interface unit 35, an ISDN processing unit 36, and a terminal selection processing unit 37.

Next, the operation of the configuration of this embodiment will be described. In FIG. 1, a call setting message from the ISDN network 31 is taken in by the line interface unit 34 which controls the layer 1 and the layer 2. Then, it is transmitted from the line interface unit 34 to the ISDN processing unit 36 that controls the ISDN layer 2 and layer 3. The call setup message is analyzed by the ISDN processing unit 36, and the value of the analyzed packet size information element is notified to the terminal selection processing unit 37.

The ISDN processing unit 36 also sends a call setup message to the line interface unit 35. The line interface unit 35 transmits a call setting message to the packet terminals 33a to 33d. Packet terminal 33a-
Upon receiving the call setup message, 33d returns a response message.

Upon receiving the response message from the packet terminals 33a to 33d through the line interface unit 35, the ISDN processing unit 36 notifies the terminal selection processing unit 37 of the channel identifier of the response message and the information of the reception order.
In the terminal selection processing unit 37, based on the value of the packet size information element of 4096 octets, the channel information from the channel identifier, and the reception order of the response message,
The terminal 33c which is the B channel terminal among the terminals 33a to 33d having the earliest reception order is selected and notified to the ISDN processing unit 36.

Further, it also notifies the other terminals 33a, 33b, 33d of the release of the call. In the ISDN processing unit 36, the response message of the selected terminal 33c is sent to the line interface unit 34, and the unselected terminal 33 is sent.
A release message (reason display # 26: disconnection recovery of unselected user) is created for a, 33b, and 33d and transmitted to the line interface unit 35. Further, it is transmitted from the line interface unit 35 to the terminals 33a to 33d.

FIG. 2 is a sequence diagram related to this operation. In FIG. 2, the process [41] is a call setup message upon arrival of a call from the ISDN network 31, and the value of its packet size information element is 4096 octets.

In the process [42], the response messages [F], [G], [H], and [I] are transmitted to the terminals 33a to 33.
It is assumed that the data are transmitted in order from d. The process 43 is the process 42.
The response message [H] is sent from the terminal selection device 32 to the ISDN network 31.

In the process 44, the release messages (reason indication # 26) [J], [K] and [L] are for releasing the call to the terminals 33a, 33b and 33d which are not selected. Is. In the process 45, the release completion messages [M], [N] and [O] are sent to the terminals 33a, 33b,
It is for releasing the call to 33d.

Thereafter, the ISDN network 31 and the terminal 33c are exchanged by the response confirmation message, the incoming call (CN) packet, and the incoming call acceptance (CA) packet after the process 46.
The normal B channel packet switching call connection operation is performed.

FIG. 3 shows a sequence diagram when all the terminals 33a to 33d are D channel packet terminals.

The ISDN processing unit 36 in FIG.
Call setup message in the line interface unit 35
The timer T is started when it is sent to By this activation, the channel identifiers in the response messages [P], [Q], [R], and [S] in the process 52 from the terminals 33a to 33d are notified to the terminal selection processing unit 37 in FIG. In this case, the ISDN processing unit 3 operates during the timer T in which the information of the B channel is not obtained from any channel identifier.
6 keeps waiting for a reply message. At the time when the ISDN processing unit 36 notifies the terminal selection processing unit 37 that the timer T has timed out, the terminal selection processing unit 37 informs the ISDN processing unit 37 that the call connection operation will be started in response to the response message from the terminal 33a having the earlier order. Notify 36.

Also, the ISDN processing unit 36 is notified to the terminals 33b to 33d that the call release operation will be started.

As described above, when the value of the packet size information element indicated in the call setup message is a long packet, the B channel packet terminal is preferentially selected.
Therefore, the possibility that the requester's packet size request value is changed is reduced, and the communication charge can be reduced.

[0024]

As is apparent from the above description, the ISDN packet terminal selection device of the present invention has a plurality of packet size information elements indicated in the call setup message from the network when the value is a long packet. By referring to the channel identifiers of response messages from the B-channel packet terminal and the D-channel packet terminal, the B-channel packet terminal is discriminated and selected preferentially, and the call connection is performed. It has the effect of being able to.

[Brief description of drawings]

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

FIG. 2 is a sequence diagram according to the operation of the embodiment.

FIG. 3 is a sequence diagram in the operation of the embodiment when all D channel packet terminals are used.

FIG. 4 is a block diagram for explaining a conventional example and showing a point / multipoint connection form of a communication network and a plurality of terminals.

FIG. 5 is a sequence diagram of an operation in a point / multipoint connection mode, which is used for explaining a conventional example.

[Explanation of symbols]

 31 ISDN network 32 Terminal selection device 33a to 33d Packet terminal 34, 35 Line interface section 36 ISDN processing section 37 Terminal selection processing section

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Claims (1)

[Claims] 1. An ISDN packet terminal selecting device connected between a B channel packet terminal, a D channel packet terminal and an ISDN network in a point / multipoint form of ISDN packet switching, comprising: ISDN processing means; Selection processing means, and prioritizing connection of a B channel packet terminal in the case of a long packet in which the value of the packet size information element shown in the call setup message is larger than 256 octets when receiving from the ISDN network. Characteristic ISDN packet terminal selection device.